Agrément Certificate 17/5471 website: Product Sheet 3

Transcription

1 Alumasc Exterior Building Products Ltd White House Works Bold Road St Helens Merseyside WA9 4JG Tel: Page 1 of 26 Agrément Certificate info@alumascfacades.com 17/5471 website: Product Sheet 3 ALUMASC EXTERNAL WALL INSULATION SYSTEMS EXICCO PRO (MW) EXTERNAL WALL INSULATION SYSTEMS FOR STEEL-FRAMED BUILDINGS This Agrément Certificate Product Sheet (1) relates to Exicco Pro (MW) External Wall Insulation Systems for steel-framed buildings, comprising mineral wool (MW) insulation slabs mechanically fixed to sheathed substrates using spacer rails, with a reinforced basecoat and either silicone render or acrylic brick-slip finishes. The systems are suitable for use on sheathed steel-framed wall substrates of new and existing domestic or non-domestic buildings with no height restriction. (1) Hereinafter referred to as Certificate. CERTIFICATION INCLUDES: factors relating to compliance with Building Regulations where applicable factors relating to additional non-regulatory information where applicable independently verified technical specification assessment criteria and technical investigations design considerations installation guidance regular surveillance of production formal three-yearly review. KEY FACTORS ASSESSED Thermal performance the systems can improve the thermal performance of external walls and can contribute to satisfying the requirements of the national Building Regulations (see section 6). Strength and stability the systems can adequately resist wind loads and impact damage. The impact resistance is dependent on the finish chosen (see section 7). Behaviour in relation to fire the systems have an A2-s1, d0 reaction to fire classification in accordance with BS EN : 2007 (see section 8). Risk of condensation the systems can contribute to limiting the risk of interstitial and surface condensation (see section 10). Durability when installed and maintained in accordance with the Certificate holder s recommendations and this Certificate, t the systems will remain effective for at least 30 years (see section 12). The BBA has awarded this Certificate to the company named above for the systems described herein. These systems have been assessed by the BBA as being fit for their intended use provided they are installed, used and maintained as set out in this Certificate. On behalf of the British Board of Agrément Date of First issue: 2 February 2018 John Albon Head of Approvals Construction Products Claire Curtis-Thomas Chief Executive The BBA is a UKAS accredited certification body Number 113. The schedule of the current scope of accreditation for product certification is available in pdf format via the UKAS link on the BBA website at Readers are advised to check the validity and latest issue number of this Agrément Certificate by either referring to the BBA website or contacting the BBA direct. British Board of Agrément Bucknalls Lane Watford Herts WD25 9BA 2018 tel: clientservices@bbacerts.co.uk

2 Regulations In the opinion of the BBA, Exicco Pro (MW) External Wall Insulation Systems for steel-framed buildings, if installed, used and maintained in accordance with the provisions of this Certificate, can satisfy or contribute to satisfying the relevant requirements of the following Building Regulations (the presence of a UK map indicates that the subject is related to the Building Regulations in the region or regions of the UK depicted): The Building Regulations 2010 (England and Wales) (as amended) Requirement: A1 Loading The systems can sustain and transmit wind loads to the substrate wall. See sections 7.1 to 7.12 of this Certificate. Requirement: B4(1) External fire spread The systems can satisfy this Requirement. See sections 8.1 to 8.4 of this Certificate. Requirement: C2(b) Resistance to moisture The systems provide a degree of protection against rain ingress. See sections 4.4 and 9.1 of this Certificate. Requirement: C2(c) Resistance to moisture The systems can contribute to minimising the risk of interstitial and surface condensation. See sections 10.1, 10.2 and 10.4 of this Certificate. Requirement: L1(a)(i) Conservation of fuel and power The systems can contribute to satisfying this Requirement. See sections 6.2 and 6.3 of this Certificate. Regulation: 7 Materials and workmanship The systems are acceptable. See section 12.1 and the Installation part of this Certificate. Regulation: 26 CO2 emission rates for new buildings Regulation: 26A Fabric energy efficiency rates for new dwellings (applicable to England only) Regulation: 26A Primary energy consumption rates for new buildings (applicable to Wales only) Regulation: 26B Fabric energy efficiency rates for new dwellings (applicable to Wales only) The systems can contribute to satisfying these Regulations but compensating fabric and/or services measures may need to be taken. See sections 6.2 and 6.3 of this Certificate. The Building (Scotland) Regulations 2004 (as amended) Regulation: 8(1)(2) Durability, workmanship and fitness of materials The systems can contribute to the construction satisfying this Regulation. See sections 11 and 12.1 and the Installation part of this Certificate. Regulation: 9 Building standards applicable to construction Standard: 1.1 Structure The systems can sustain and transmit wind loads to the substrate wall. See sections 7.1 to 7.12 of this Certificate. Standard: 2.6 Spread to neighbouring buildings The external surfaces of the systems are classified as non combustible, with reference to clauses (1)(2), (1) and (2) of this Standard. See sections 8.1 to 8.4 of this Certificate. Page 2 of 26

3 Standard: 2.7 Spread on external walls The external surfaces of the systems are classified as non combustible, with reference to clauses (1)(2) and (1)(2) and Annex 2A (1) of this Standard. See sections 8.1 to 8.4 of this Certificate. Standard: 3.10 Precipitation The systems will contribute to a construction satisfying this Standard, with reference to clauses (1)(2) and (1)(2). See sections 4.4 and 9.1 of this Certificate. Standard: 3.15 Condensation The systems can satisfy the requirements of this Standard, with reference to clauses (1)(2), (1)(2) and (1)(2). See sections 10.3 and 10.4 of this Certificate. Standard: 6.1(b) Carbon dioxide emissions Standard: 6.2 Buildings insulation envelope The systems can contribute to satisfying these Standards, with reference to clauses (1)(2), (1)(2), (1), (1), (2), (1)(2), (1), (2), (2), (1), (1), (2), (1)(2), (1), (1), (2) and (1)(2). See sections 6.2 and 6.3 of this Certificate. Standard: 7.1(a)(b) Statement of sustainability The systems can contribute to satisfying the relevant requirements of Regulation 9, Standards 1 to 6, and therefore will contribute to a construction meeting the bronze level of sustainability as defined in this Standard. In addition, the systems can contribute to a construction meeting a higher level of sustainability as defined in this Standard, with reference to clauses (1)(2) [Aspect 1 (1)(2) and 2 (1) ], (1)(2) [Aspect 1 (1)(2) and 2 (1) ] and (1)(2) [Aspect 1 (1)(2) ]. See section 6.2 of this Certificate. Regulation: 12 Building standards applicable to conversions All comments given for the systems under Regulation 9, Standards 1 to 6, also apply to this Regulation, with reference to clause (1)(2) and Schedule 6 (1)(2). (1) Technical Handbook (Domestic). (2) Technical Handbook (Non-Domestic). The Building Regulations (Northern Ireland) 2012 (as amended) Regulation: 23 Fitness of materials and workmanship The systems are acceptable. See section 12.1 and the Installation part of this Certificate. Regulation: 28(b) Resistance to moisture and weather The systems provide a degree of protection against rain ingress. See sections 4.4 and 9.1 of this Certificate. Regulation: 29 Condensation The systems contribute to minimising the risk of interstitial condensation. See section 10.4 of this Certificate. Regulation: 30 Stability The systems can sustain and transmit wind loads to the substrate wall. See sections 7.1 to 7.12 of this Certificate. Regulation: 36(a) External fire spread The systems can satisfy this Regulation. See sections 8.1 to 8.4 of this Certificate. Page 3 of 26

4 Regulation: 39(a)(i) Conservation measures Regulation: 40 Target carbon dioxide emission rate The systems can contribute to satisfying these Regulations. See sections 6.2 and 6.3 of this Certificate. Construction (Design and Management) Regulations 2015 Construction (Design and Management) Regulations (Northern Ireland) 2016 Information in this Certificate may assist the client, designer (including Principal Designer) and contractor (including Principal Contractor) to address their obligations under these Regulations. See section: 3 Delivery and site handling (3.1 and 3.8) of this Certificate. Additional Information NHBC Standards 2018 In the opinion of the BBA, Exicco Pro (MW) External Wall Insulation Systems for steel-framed buildings, if installed, used and maintained in accordance with this Certificate, can satisfy or contribute to satisfying the relevant requirements in relation to NHBC Standards, Part 6 Superstructure (excluding roofs), Chapter 6.9 Curtain walling and cladding. Technical Specification 1 Description 1.1 Exicco Pro External Wall Insulation Systems for steel-framed buildings (see Figure 1) comprise MW insulation slabs, mechanically fixed at maximum 600 mm centres to vertical Exicco Spacer Rails, attached to the external surface of 12 mm (minimum) cement particle boards (CPB) (1) to create a 25 mm drained cavity. The insulation slabs are covered with a polymer modified reinforcement coat, glassfibre reinforcement mesh, primer and either silicone render (Silkolitt) or acrylic brick-slip (VBriQ) finishes. (1) See section 4.7, and Table The components of the systems comprise: Exicco Base Rail Exicco Base rail an aluminium base rail 2500 mm long with drainage holes, consisting of <500 mm 2 m 1 per metre length of wall and fixed to the CPB at 300 mm centres using Fischer screws. See section 4.7 Exicco Fixing Fischer FABS 42 range of self-drilling screws, 5.5 mm diameter, made of case-hardened carbon steel with a Climadur organic coating, used for fastening the base rail and spacer rails to the sheathed steel-framed substrate Exicco Fixing EJOT SAPHIR LS range of self-drilling screws, 5.5 mm diameter, made of case-hardened carbon steel with an organic corrosion resistance finish, used for fastening the base rail and spacer rails to the sheathed steelframed substrate Exicco Spacer Rails (see Figure 1) Exicco Spacer Rails (1) 1.0 mm gauge thickness, 25 mm high by 166 mm wide, 2500 mm long (approximately) top hat rail profiles, used to create a cavity. Positioned vertically at maximum 600 mm centres and fixed to the substrate at 300 mm vertical centres into both sides of the flange using either Fischer FABS 42 or EJOT SAPHIR LS fixings (1) Other spacer rails may be used provided they can be demonstrated to have equal or higher bending strength and mechanical characteristics. (2) Bespoke lengths can be manufactured to provide onsite efficiencies subject to the Certificate holder s approval. Page 4 of 26

5 Exicco Insulation Fixings mechanical fixings Rawlplug WX-T-58 self-drilling screws of 5.8 mm diameter, made from case-hardened carbon steel pin with a Climadur organic coating and used with a Rawlplug KCX Tubed Insulation Washer (1) with a 60 mm diameter plate and Rawlplug KWL-090PP, a 90 mm wide flange. For fastening the insulation to the Exicco Spacer Rails (1) Rawlplug KCX Tubed Insulation Washers come in various lengths to suit the thickness of the insulation specified. Insulation (1)(2) Alumasc MWDD insulation 1200 by 600 mm in a range of thicknesses between 60 and 200 mm, with an average density of 110 kg m 3, a minimum tensile strength perpendicular to the faces of 10 kn m 2 and a compressive strength at 10% deformation of 20 kpa. Slabs are manufactured to comply with BS EN : 2012 (1) For declared thermal conductivity (λd) values, see Table 3. (2) Insulation thicknesses of 30 to 50 mm would generally be used in reveals. Basecoat Alumasc Base Coat (ABC) a cement-based, polymer-modified basecoat supplied as a powder requiring the addition of 4.5 to 5 litres of clean water per bag. Applied to a minimum thickness of 5 mm with a coverage of 6 kg m 2 Reinforcement mesh Alumasc Scrim Reinforcement a one metre wide mesh of alkali-resistant glassfibre, weighing approximately 160 g m 2, with a grid size of 3.5 by 3.5 mm Primers Alumasc Silicone Primer a silicone primer containing fine quartz grains, used as a bonding aid, with a coverage rate of 250 to 300 g m 2 Alumasc Silicone Primer+ a silicone primer containing fine quartz grains, used as a bonding aid, with a coverage rate of 250 to 300 g m 2 Brick-slips adhesive VBriQ Adhesive an organic-bound, water-based cement-free adhesive which is pre-mixed in a tub. Applied to a nominal thickness of 5 mm, with a coverage of 2.5 to 3.4 kg m 2 Finishes Alumasc Silkolitt Silicone Render a silicone-based textured render supplied as a paste in three grades of grain size: 1.5 mm with a coverage of 2.6 kg m 2, 2.5 mm with a coverage of 3.3 kg m 2 and 3.5 mm with a coverage of 4.2 kg m -2. The finished thickness is regulated by particle size Alumasc Silkolitt+ Silicone Render a silicone based textured render supplied as a paste in four grades of grain size: 1.0 mm with a coverage of 2.0 kg m 2, 1.5 mm with a coverage of 2.5 kg m 2, 2.0 mm with a coverage of 3.0 kg m 2 and 3.0 mm with a coverage of 4.0 kg m 2. The finished thickness is regulated by particle size VBriQ Brick-Slips poly-acrylic brick-slips containing quartz sand fillers, 65 by 215 by 4 mm (standard size, other sizes are available on request) with a nominal weight of 6 kg m 2. Available as straight brick-slips and corner brickslips in various colours (colours can also be manufactured to match existing brickwork). Page 5 of 26

6 Figure 1 Exicco Pro (MW) External Wall Insulation Systems 1.3 Ancillary materials for use with the systems include: a range of profiles comprising: stainless steel, powder-coated galvanized steel or PVC-U, corner, bell cast and render stop profiles profile connectors and fixings water drainage deflector channels for use above openings. 1.4 Ancillary materials also for use with the systems, but outside the scope of this Certificate, include: aluminium or PVC-U movement joint aluminium or PVC-U expansion joint insect mesh cavity stops joint sealant and silicone mastic, hydrophobic sealing tape sheathed substrate and fixings. 2 Manufacture 2.1 The systems components are either manufactured by the Certificate holder or bought-in from suppliers, to an agreed specification. Page 6 of 26

7 2.2 As part of the assessment and ongoing surveillance of product quality, the BBA has: agreed with the manufacturer the quality control procedures and product testing to be undertaken assessed and agreed the quality control operated over batches of incoming materials monitored the production process and verified that it is in accordance with the documented process evaluated the process for management of nonconformities checked that equipment has been properly tested and calibrated undertaken to carry out the above measures on a regular basis through a surveillance process, to verify that the specifications and quality control operated by the manufacturer are being maintained. 2.3 The management system of Alumasc Exterior Building Products Ltd has been assessed and registered as meeting the requirements of BS EN ISO 9001 : 2008 by the Centre for Assessment Ltd (Certificate 02/1832). 3 Delivery and site handling 3.1 Each package carries the product identification and the BBA logo incorporating the number of this Certificate. The systems components are delivered to site in the packaging and quantities listed in Table 1. Table 1 Component supply details Component Exicco Base Rail Insulation slabs Alumasc Base Coat (ABC) Reinforcement mesh Alumasc ST Primer and ST Primer+ VBriQ Adhesive VBriQ Slips Straight Brick-slips VBriQ Slips Corner Brick-slips Exicco Spacer Rails, corner, frame and deflection channel profiles Mechanical fixings Alumasc Silkolitt Alumasc Silkolitt+ Quantity/packaging 2500 mm lengths sealed packs 25 kg bag 1 m wide roll, 50 m length 23 kg tub 25 kg tub 116 pieces per box 26 pieces per box 2500 or 3000 mm lengths boxed 25 kg tub 25 kg tub 3.2 The insulation slabs must be stored on a firm, clean, level base, off the ground and under cover until required for use. Care must be taken when handling to avoid damage. 3.3 The insulation must be protected by storing opened packs under cover or re-covering with opaque polythene sheeting. Care must be taken to avoid contact with solvents or materials containing volatile organic components. Slabs that become damaged, soiled or wet should be discarded. 3.4 VBriQ Adhesive must be protected from exposure to sunlight and frost, and stored below 30 C. When stored correctly, unopened tubs will have a shelf-life of 18 months from the date of manufacture. 3.5 VBriQ Brick-Slips may become brittle once cold and susceptible to breaking; it is recommended that they are naturally warmed before progressing with the application. 3.6 The basecoat, primers, topcoats and cementitious materials must be stored in dry conditions within 5 C and 30 C, off the ground and protected from moisture, direct sunlight and frost at all times. Contaminated material must be discarded. 3.7 The spacer rails must be protected from humidity and stored indoors. 3.8 The Certificate holder has taken the responsibility of classifying and labelling the systems components under the CLP Regulation (EC) No 1272/2008 on the classification, labelling and packaging of substances and mixtures. Users must refer to the relevant Safety Data Sheet(s). Page 7 of 26

8 Assessment and Technical Investigations The following is a summary of the assessment and technical investigations carried out on Exicco Pro (MW) External Wall Insulation Systems for steel-framed buildings. Design Considerations 4 General 4.1 Exicco Pro (MW) External Wall Insulation Systems for steel-framed buildings, when installed in accordance with this Certificate, are satisfactory for use in reducing the thermal transmittance (U value) of external sheathed steel framed walls of new and existing buildings. It is essential that the detailing techniques specified in this Certificate are carried out to a high standard if the ingress of water into the insulation is to be avoided and the full thermal benefit obtained from treatment with the systems (eg the insulation must be protected by an overhang, and window sills should be designed and installed so as to direct water away from the building). 4.2 For improved thermal/carbon-emissions performance, the designer should consider additional/alternative fabric and/or services measures. 4.3 The systems are for application to the outside of steel-framed buildings sheathed with panels on new or existing domestic and non-domestic buildings with no height restriction. Prior to installation of the systems, wall surfaces should comply with section New walls subject to the national Building Regulations should be constructed in accordance with the relevant recommendations of: BS EN : 2005 and its UK National Annex BS : 2014 BS EN : 2015 BS EN : New walls not subject to regulatory requirements should also be built in accordance with the Standards identified in section Movement joints should be incorporated into the systems in line with existing movement joints in the building structure, in accordance with the Certificate holder s recommendations for the specific installation. 4.7 The systems must provide a minimum 25 mm wide drained cavity (1)(2) between the sheathing board and the insulation (see Figure 1 for ventilation openings). The cavity is vented to allow some limited outside air ingress; however, it is classed as an unventilated cavity in accordance with BS EN ISO 6946 : 2017 and, therefore, will not affect the U value calculation of the wall. Openings should be up to a maximum of 500 mm 2 per metre of wall length (in the horizontal direction) for vertical layers. The openings must be kept clean and free of obstructions, and be capable of draining freely. (1) Horizontal deflection channels which obstruct the cavity must not be used to support the insulating render system. (2) Cavities must not contain electrical cables other than meter tails. 4.8 The structural frame of the building, including the sheathing boards, is the responsibility of the building designer and is outside the scope of this Certificate. However, the structural frame (and sheathing-associated fixings) should be structurally adequate and must be designed to resist loads due to wind, impact and self-weight (see Table 2 for minimum specifications). Page 8 of 26

9 Table 2 Minimum steel-framed construction requirements Item Characteristic Specifications Steel-framed structure (1) Sheathing board (1) (CPB) Cold-formed steel-framed members should have a maximum flange width-to-thickness ratio b/t 50 in accordance with BS EN mm thickness minimum Exterior grade in accordance with BS EN Type S 320 GD +Z275 Nominal density of 1000 kg m 3 and modulus of elasticity in bending >4500 MPa. Manufactured to BS EN Class 1 (1) The board and the structural steel-frame must be of an exterior grade, with the minimum acceptable specification as given in this Table. Both components are outside the scope of this Certificate. 4.9 The systems will improve the weather resistance of a wall and provide a decorative finish. However, care should be taken to ensure that walls are adequately weathertight prior to application. The systems should only be installed where there are no signs of dampness on the inner surface of the wall The effect of the systems on the acoustic performance of a construction is outside the scope of this Certificate The fixing of sanitary pipework, plumbing, rainwater goods, satellite dishes, clothes lines, hanging baskets and similar items to the systems is outside the scope of this Certificate External pipework and ducts should be removed before installation, and alterations made to underground drainage to accommodate repositioning of the pipework to the finished face of the systems. The Certificate holder can advise on suitable fixing methods The designer should select a construction appropriate to the local wind-driven rain index, paying due regard to the design detailing, workmanship and materials to be used The designer should make sure that windows, doors, flashings and other similar items have been specifically designed for use with these types of systems particular attention should be paid to the prevention of water ingress into the system. For example, junctions between the system and window and door openings must avoid creating a direct path that could facilitate the transfer of water from the external surface of the wall into the wall construction or to the internal surface. In addition, opening and penetration details should be designed to deflect water away from the insulation and onto the external face of the wall. The sheathing board must be of a suitable exterior grade with appropriately sealed joints, sealed penetrations and vapour control layers (VCL) where required. 5 Practicability of installation The systems should only be installed by approved contractors who have successfully undergone training and registration by the Certificate holder (see section 14). Note: The BBA operates a UKAS-accredited Approved Installer Scheme for external wall insulation (non-mandatory); details of approved installer companies are included on the BBA website ( 6 Thermal performance 6.1 Calculations of thermal transmittance (U value) should be carried out in accordance with BS EN ISO 6946 : 2017 and BRE Report BR 443 : 2006, using the insulation manufacturer s declared thermal conductivity value (λd) given in Table 3. Table 3 Declared thermal conductivity of the insulation (λd) Insulation type Thickness (mm) Thermal conductivity (W m 1 K 1 ) MWDD 60 to Page 9 of 26

10 6.2 The U value of a completed wall will depend on the selected insulation type and thickness, the degree of ventilation to the cavity, fixing method and type of fixing, and the insulating value of the substrate and its internal finish. Example U values for a steel-framed construction with a drained unventilated cavity in accordance with the national Building Regulations are given in Table 4, and are based on the thermal conductivities given in Table 3. Table 4 Insulation thickness required to achieve typical design U values (1)(2) U value (W m 2 K 1 ) (1)(2) Thickness of insulation (mm) Steel-frame (3)(4)(5) MW (1) Assume an air gap correction (ΔU) of 0.01 and incremental insulation thicknesses of 10 mm. (2) No value has been assumed for vertical spacer rail top hat profiles within the cavity. (3) Wall construction inclusive of 12.5 mm plasterboard (λ = 0.25 W m 1 K 1 ), 12 mm CPB (λ = 0.23 W m 1 K 1 ), and 8.5 mm external render (λ = 1.0 W m 1 K 1 ). (4) Cavity assumed to be unventilated, with a ventilation rate of mm 2 m. (5) Steel-frame has been excluded from the calculations. 6.3 Care must be taken in the overall design and construction of junctions with other elements and openings, to minimise thermal bridges and air infiltration. Detailed guidance can be found in the documents supporting the national Building Regulations. 7 Strength and stability General 7.1 The Certificate holder is ultimately responsible for the design of installations incorporating the systems, and must verify that a suitably experienced and qualified individual (with adequate professional indemnity) establishes that: the wind loads on the different zones of the building s elevation for the specific geographical location have been calculated correctly (see section 7.2) the systems can adequately resist and safely transfer the calculated loads for all possible failure modes (see sections 7.2 to 7.5) the substrate wall has adequate strength and stability to resist the additional loads that may be applied as a result of installing the systems, ignoring any positive contribution that may occur from the systems, and gives an acceptable resistance to pull-out of fixings. 7.2 The wind loads on the walls should be calculated, taking into account all relevant factors such as location and topography, in accordance with BS EN : 2005 and its UK National Annex. All factors affecting wind load on each elevation and specific zone of the building must be considered. In accordance with BS EN 1990 : 2002 and its UK National Annex, a partial factor of 1.5 must be applied to the characteristic values determined from BS EN : 2005 to establish the ultimate wind load to be resisted by the systems. 7.3 Installations correctly designed in accordance with this Certificate will safely accommodate the applied loads due to self-weight of the systems, wind and impact. 7.4 Positive wind load is transferred to the substrate wall directly via compression in the render, insulation and profiles. Page 10 of 26

11 7.5 Negative wind load is transferred to the substrate wall via (1) : the bond between the insulation and render system the pull-out resistance of the insulation fixing from the profiles the pull-through resistance of the insulation fixing the pull-through resistance of the profile fixing from profiles the pull-out resistance of the profiles fixing from the substrate (see section 7.6 and 7.7). (1) Further guidance is given in BBA Guidance Note 1, available on the BBA website ( 7.6 The design bond resistance between the insulation and reinforced basecoat should be greater or equal to the design wind load resistance given in section Typical characteristic pull-out resistances of the profile fixings from the substrate obtained from the laboratory pull-out tests are given in Table 5. The pull-out resistance depends on the fixing type, which must be selected to suit the specific loads and substrate. The typical design pull-out resistance (Nrd.Typ) is derived by dividing the characteristic test resistance value by the partial factor given in Table 5. Table 5 Typical characteristic pull-out resistances of profile fixings substrate Fixing type Substrate facing Characteristic pull-out strength (1) Fischer Fabs 42 with 5.5 mm diameter selfdrilling screw with a 14 mm flanged head Through the spacer rails, 12 mm board thickness (kn) Partial factor (2) (1) Values obtained from tests. (2) The partial factor should be applied to obtain the typical design pull-out resistance (Nrd.Typ) and depends on the substrate material. 7.8 The design pull-out resistance of the profile fixings from the substrate, obtained from site tests (Nrd1), must not be less than the typical design pull-out resistance (NRD.TYP) for a similar substrate. The characteristic pull-out resistance based on site tests is determined in accordance with the guidance given in EOTA TR051 (characteristic pull-out resistance = 0.6 x mean of 5 lowest test results and should be 1.5 kn). To obtain the site design pull-out resistance of the fixings, this characteristic site pull-out resistance should be divided by the partial factor given in Table 5 for a similar substrate. 7.9 The spacing, layout and number of insulation and profile fixings was confirmed by a dynamic wind uplift test. Provided the substrate wall is suitable and appropriate fixings are selected, the profiles and associated fixings will adequately support the self-weight of the systems, and transfer the wind and impact loads to the substrate wall at the maximum spacing given in section The dynamic wind uplift test was carried out on a sheathed steel-framed building and the system installed with vertical steel spacer rails at 600 mm horizontal spacing; the rails were fastened to 12 mm thick CPB (providing a minimum 25 mm cavity), with screws at 300 mm vertical centres in both flanges. Insulation slabs were fastened to the vertical profiles with anchors, with the layout and spacing pattern as shown in Figure 4. The maximum design negative wind load that can be sustained by the system as determined from the dynamic wind uplift test (Rd Test ) is equal to 2.40 kn m -2(1)(2). (1) The maximum design wind load that can be carried by the systems corresponds to the maximum allowed spacing and centres of fixings and profiles, as described in 7.9. Spacing and centres of fixings and profiles can be reduced to the minimum recommended, see section 16. (2) The design resistance is determined by dividing the characteristic resistance value obtained from a dynamic wind uplift test by a partial safety factor of The horizontal deflection of the supporting structure due to variable loads should be within acceptable limits. The suggested limit for the maximum horizontal deflection is the height of the storey/360, in accordance with the UK National Annex to BS EN : The Certificate holder may advise on the limiting deflection for the systems. Page 11 of 26

12 7.12 The data derived from sections 7.6 to 7.11 must be assessed against the design wind load and the following expressions must be satisfied: For safe design: RdTest We and NRD1 NRD.TYP Where: RdTest is the negative wind load resistance of the system based on test (kn m 2 ) We is the maximum applied wind load (kn m 2 ) NRD1 is the design pull-out resistance based on site test (kn) NRD.TYP is the typical design pull-out resistance (kn). Impact resistance 7.13 Hard body impact tests were carried out in accordance with ETAG 004 : The systems are suitable for use in the Use Categories (1) up to and including those specified in Table 6. Table 6 Exicco Pro (MW) External Wall Insulation Systems impact resistance Render systems: Basecoat + primer, plus finishing coat as indicated below: Alumasc Silkolitt Alumasc Silkolitt+ VBriQ Adhesive and VBriQ Brick-Slips Use Category (1) Single mesh Category II Category l (1) The Use Categories are defined in ETAG 004 : 2013 as: Category I a zone readily accessible at ground level to the public and vulnerable to hard body impacts but not subjected to abnormally rough use Category II a zone liable to impacts from thrown or kicked objects, but in public locations where the height of the system will limit the size of the impact; or at lower levels where access to the building is primarily to those with some incentive to exercise care Category III a zone not likely to be damaged by normal impacts caused by people or by thrown or kicked objects. 8 Behaviour in relation to fire 8.1 The systems have a reaction to fire classification of A2-s1, d0 in accordance with BS EN : The fire classification applies to the full range of insulation thicknesses covered by this Certificate. 8.3 The MW insulation material is classified as non-combustible. 8.4 The systems are considered suitable for use on, or at any distance from, the boundary and there is no height restriction on their use. 8.5 For application to second storey walls and above, it is recommended that the designer considers at least one stainless steel fixing per square metre as advised in BRE Report BR 135 : Water resistance 9.1 The systems will provide a degree of protection against rain ingress. However, care should be taken to ensure that walls are adequately watertight prior to application. The systems must only be installed where there are no signs of dampness on the inner surface of the substrate other than those caused solely by condensation. 9.2 Designers and installers must take particular care in detailing around openings, penetrations and movement joints, to minimise the risk of water ingress. Page 12 of 26

13 9.3 The guidance given in BRE Report BR 262 : 2002 should be followed in connection with watertightness. 9.4 At the top of walls, the systems must be protected by an adequate coping, overhang or other detail designed for use with these types of systems (see section 15). On flat roofs parapet walls, waterproofing and drainage must be adequate and in good condition. 10 Risk of condensation Surface condensation 10.1 Designers must ensure that an appropriate condensation risk analysis has been carried out for all parts of the construction, including openings and penetrations at junctions between the systems and windows, to minimise the risk of condensation. The recommendations of BS 5250 : 2011 should be followed Walls will adequately limit the risk of surface condensation when the thermal transmittance (U value) does not exceed 0.7 W m 2 K 1 at any point and the junctions with other elements and openings comply with section Walls will adequately limit the risk of surface condensation when the thermal transmittance (U value) does not exceed 1.2 W m 2 K 1 at any point. Guidance may be obtained from BS 5250 : 2011 Section 4, and BRE Report BR 262 : Interstitial condensation 10.4 Walls incorporating the systems will adequately limit the risk of interstitial condensation when they are designed and constructed in accordance with BS 5250 : 2011 (Section 4, and Annexes D and G) and section 10.5 of this Certificate The water vapour resistance factor (μ) for the insulation and the equivalent air layer thickness (sd) of the reinforced basecoat applied with a finish coat are shown in Table 7. Table 7 Water vapour resistance factors and equivalent air layer thickness Material Thickness (mm) Sd (m) µ MW Dual Density Slab 60 to (1) Alumasc Base Coat (ABC) (2) Alumasc Base Coat (ABC), Alumasc ST Primer, Alumasc Silkolitt 6.5 to Alumasc Base Coat (ABC), Alumasc ST Primer, Alumasc Silkolitt Alumasc Base Coat (ABC), VBriQ Adhesive, VBriQ Brick-Slips (1) Value obtained from BS EN ISO : 2007, Table 4. It is recommended that the lower figure is used when assessing the interstitial condensation analysis. (2) The quoted figure is based on the minimum thickness of each layer. 11 Maintenance and repair 11.1 An initial inspection should be made within 12 months and regularly thereafter to include: visual inspection of the render for signs of damage. Cracks in the render exceeding 0.2 mm must be repaired visual inspection of the brick-slips for signs of dislodge. Dislodged brick-slips should be glued back using VBriQ Adhesive examination of the sealant around openings and service entry points visual inspection of architectural details designed to shed water to confirm that they are performing properly Page 13 of 26

14 visual inspection to ensure that water is not leaking from external downpipes or gutters; such leakage could penetrate the rendering necessary repairs effected immediately and the sealant joints at window and door frames replaced at regular intervals maintenance schedules, which should include the replacement and resealing of joints, for example between the systems and window and door frame Damaged areas must be repaired using the appropriate components and procedures detailed in the Certificate holder s installation instructions and in accordance with BS EN : Durability 12.1 The systems will remain effective for at least 30 years, provided any damage to the surface finish is repaired immediately and regular maintenance is undertaken, as described in section The renders may become discoloured with time, the rate depending on the initial colour, the degree of exposure and atmospheric pollution, as well as the design and detailing of the wall. In common with traditional renders, discoloration by algae and lichens may occur in wet areas To maintain a high quality aesthetic appearance, it may be necessary to periodically overcoat the building as recommended by the Certificate holder and in accordance with BS EN : Care should be taken not to adversely affect the water vapour transmission or fire characteristics of the systems. The advice of the Certificate holder should be sought as to the suitability of a particular product. Installation 13 Site survey and preliminary work 13.1 A pre-installation survey of the property must be carried out to determine suitability for installation, treatment of damp and any repairs necessary to the building structure before application of the systems. A specification is prepared for each elevation of the building indicating: the position of beads detailing around windows, doors and at eaves damp-proof course (dpc) level exact position of expansion joints, if required areas where flexible sealants must be used any alterations to external plumbing The survey should include tests conducted on the sheathed structural steel-framed walls of the building by the Certificate holder or their approved installers (see section 14) to determine the pull-out resistance of the specified mechanical fixings to withstand the building s expected wind loading, based on calculations using the fixing s pull-out resistance test data. In addition, the type and minimum number of fixings are selected (as per section 7). The advice of the Certificate holder should be sought to ensure the proposed fixing pattern is sufficient The flatness of surfaces must be checked; this may be achieved using a straight edge spanning the storey height. Any irregularities, must be made good prior to installation to ensure that the insulation slabs are installed with a smooth, in-plane finished surface On existing buildings, purpose-made window sills must be fitted to extend beyond the finished face of the systems. New buildings should incorporate suitably deep sills For new buildings, internal wet work, eg screed or plastering, should be completed and allowed to dry prior to the installation of the systems All modifications and necessary repairs to the building structure must be completed before installation commences. Page 14 of 26

15 14 Approved installers Application of the systems, within the context of this Certificate, must be carried out by approved and registered installers recommended or recognised by the Certificate holder. Such an installer is a company: employing operatives who have been trained and approved by the Certificate holder to install the systems which has undertaken to comply with the Certificate holder s application procedure, containing the requirement for each application team to include at least one member- operative trained by the Certificate holder subject to at least one inspection per annum by the Certificate holder to ensure suitable site practices are being employed. This may include unannounced site inspections. 15 Procedure General 15.1 Installation is carried out in accordance with the Certificate holder s current installation instructions and this Certificate Weather conditions should be monitored to ensure correct application and curing conditions. Application of coating materials must not be carried out at temperatures below 5 C or above 30 C, or if exposure to frost is likely, and the coating must be protected from rapid drying. In addition, cementitious-based renders must not be applied if the temperature will fall below 0 C within 72 hours of completion All rendering should be in accordance with the relevant recommendations of BS EN : Positioning and securing insulation slabs 15.4 The base rail is secured to the external wall above the dpc (see Figure 3) using approved profile fixings at approximately 300 mm centres. Base track clips are fixed to the front lip at the base of the joints to aid system extensions. Different clips are used dependent on the specified finish, details are available from the Certificate holder. Figure 2 Typical section of base rail Page 15 of 26

16 15.5 The spacer rails are mounted vertically at maximum 600 mm centres and mechanically fixed to the sheathing board substrate with self-drilling screws into both sides of the rail flange. The fixings are placed staggered at a maximum spacing of 300 mm vertically. Spacer rails may need to be packed to ensure they are true to line and level. Deflection channel profiles are mechanically fixed over all window and door openings (see Figure 4). Horizontal and vertical intumescent strips (1) are installed following the Certificate holder s instructions. Care should be taken not to overdrive the fixings. (1) Outside the scope of this Certificate. Figure 3 Spacer rail fixing pattern 15.6 The first insulation slab is positioned on the base rail ensuring the high density side is placed facing outwards and secured through the slab into the spacer rail to suit the required fixing pattern using the mechanical fixing given in section 1.2. Subsequent slabs are positioned so that vertical slab joints are staggered and overlapped at building corners. Any open joints in the insulation must be addressed by repositioning the slabs. Page 16 of 26

17 Figure 4 Typical arrangement of insulation slabs and spacer rails at a building corner 15.7 Care must be taken to ensure that fixings are not overdriven and alignment is checked as work proceeds. The surface of the slabs should be smooth without high spots or irregularities The fixings are installed as per the fixing pattern, securing the insulation to the spacer rails, ensuring a minimum of six fixings per square metre (see Figure 3) Gaps greater than 10 mm should be closed by repositioning or, where appropriate, by cutting slabs to fit To fit around details such as doors and windows, insulation slabs may be cut with a sharp knife or a fine-tooth saw. Purpose-made window-sills, seals and deflection channels designed to prevent or manage water ingress are fitted, which allow water to be shed clear of items bridging the cavity. Corner profiles are fixed to all building corners and frame rails are fitted to door and window heads and jambs (see Figures 4 and 8) Installation continues until the whole wall is completely covered including, where appropriate, the building soffits. Movement joints The systems incorporate provision for movement joints (see Figure 5) Expansion beads are fixed horizontally or vertically through the systems in predetermined positions, according to the installation specification and the individual requirements of each project. Page 17 of 26

18 Figure 5 Horizontal and vertical movement joint detail Page 18 of 26

19 Application of basecoat and reinforcement mesh Prior to the application of the reinforcement mesh and basecoat, pre-compressed sealing tape is inserted at window and door frames, overhanging eaves, gas and electric meter boxes, and wall vents, or where the render abuts any other building material or surface, with the addition of a silicone seal. Alternatively, proprietary sealing beads can be used in accordance with the Certificate holder s instructions The basecoat render is prepared by mixing the contents of each 25 kg bag with approximately 4.5 to 5 litres of cold, clean water, using a paddle mixer. The mix should be left to stand for five minutes then remixed before application, in order to allow an even dispersion of resins The first coat of the mixed basecoat render is trowel-applied to the surface of dry insulation slab to a thickness of 3 to 6 mm. The reinforcement mesh is placed and immediately bedded into the basecoat, overlapping at all mesh joints by a minimum of 75 mm; it is important to ensure that the mesh is free of wrinkles. The first layer of basecoat should be left to harden Additional pieces of reinforcement mesh (500 by 250 mm) are used diagonally at the corners of openings, as shown in Figure PVC meshed corner beads are bedded into the basecoat around openings and external corners, as required. Figure 6 Additional reinforcement mesh at openings After the reinforcement mesh is applied, extra fixings are fixed through the mesh into the spacer rail at 600 mm horizontal centres maximum, and 1000 mm vertical centres maximum, for extra wind load resistance. These extra fixings are then covered with 100 x 100 mm patches of reinforcement mesh, placed over the head of each additional fixing and bedded into the basecoat (see Figure 7). Page 19 of 26

20 Figure 7 Extra fixings through the reinforcement mesh A second layer of basecoat is applied to a thickness of between 2 and 3 mm, ensuring all reinforcement mesh is covered and finished smooth to receive the primer. The drying time will depend upon weather conditions, but at least 12 hours should elapse before applying the primer, in accordance with the Certificate holder s instructions When the basecoat is dry, a primer coat is applied (colour to match Silkolitt, Silkolitt+ or VBriQ Adhesive) to the entire basecoat with a roller or brush Continuous surfaces should be completed without a break. Rendering and finishing Once the primer is dry, the pre-mixed topcoat is trowel-applied to a thickness of 1.0 to 3.5 mm. The silicone render is lightly mixed and applied to an even thickness, to the grain size. The topcoat is applied in a continuous motion, always working to a wet edge Prior to setting, the render is polished with a plastic float to give an even texture and to remove all trowel lines. Elevations should be completed in one application and finished to natural breaks in the render, ie beads or building corners. The texture should be checked to ensure the same batches are applied to each elevation; drums can be batchmixed to ensure colour consistency and workability Once the topcoat is dry, silicone sealant is installed at all openings (eg windows and doors), overhanging eaves and parapets, gas and electric meter boxes, wall vents or where the render abuts any other building material or surface. This helps to reduce the risk of water ingress into the structure. Brick-slip finish Alumasc VBriQ Adhesive is applied to the basecoat vertically with a 5 mm notched trowel (to achieve an approximate thickness of 2 mm in order to receive VBriQ Brick-Slips). A maximum of one-metre-square should be applied at any one time to ensure good adhesion and workability. Page 20 of 26

21 15.27 VBriQ Brick-Slips are placed by hand (60 per m 2 ) on top of the adhesive, leaving an 8 to 12 mm wide joint between the brick-slips, and pressed into position. They should be fully encapsulated in adhesive, paying particular attention to external corners, reveals and edges (to prevent water ingress behind the brick-slips) When pointing VBriQ Brick-Slips, before the adhesive has set a suitably sized damp brush is used to smooth out the adhesive over the joints. The adhesive is left to dry. Detailing Care should be taken in the detailing of the systems around such features as openings, projections, eaves and parapets (see Figures 8 to 11), to ensure adequate protection against water ingress and to limit the risk of water penetration On completion of the installation, external fittings, eg rainwater goods, are securely fixed to steel grounds or extended fixings that have been built into the systems during installation. Figure 8 Corner details Page 21 of 26

22 Figure 9 Roof eaves and parapet details Page 22 of 26

23 Figure 10 Insulated window reveal and head detail Page 23 of 26

24 Figure 11 Window sill detail Technical Investigations 16 Tests 16.1 Tests were conducted and the results assessed to determine the systems : bond strength hygrothermal performance and resistance to freeze/thaw resistance to hard body impact water absorption of render and water vapour permeability wind load resistance pull through strength of fixings weathertightness An assessment was made of data relating to: reaction to fire thermal conductivity durability the risk of interstitial condensation. 17 Investigations 17.1 The practicability of installation and the effectiveness of detailing techniques were examined The manufacturing process was evaluated, including the methods adopted for quality control, and details were obtained of the quality and composition of the materials used. Page 24 of 26