ALUMASC VENTILATED SYSTEM (AVS) ALUMASC VENTILATED RENDERED/ACRYLIC BRICK-SLIP SYSTEM FOR TIMBER FRAME BUILDINGS
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1 Alumasc Exterior Building Products Ltd White House Works Bold Road Sutton, St Helens Merseyside, WA9 4JG Tel: Fax: website: APPROVAL INSPECTION TESTING CERTIFICATION TECHNICAL APPROVALS FOR CONSTRUCTION Agrément Certificate 15/5211 Product Sheet 1 ALUMASC VENTILATED SYSTEM (AVS) ALUMASC VENTILATED RENDERED/ACRYLIC BRICK-SLIP SYSTEM FOR TIMBER FRAME BUILDINGS This Agrément Certificate Product Sheet (1) relates to Alumasc Ventilated Rendered/Acrylic Brick-Slip System for Timber Frame Buildings, for use as an exterior wall cladding panel system. (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 Strength and stability the system can accept surface loadings likely to be met in the UK (see section 6). Performance in relation to fire the system has a reaction to fire classification of A2-s1, d0 in accordance with BS EN : 2007 (see section 7). Weathertightness the system is weather and moisture resistant (see section 9). Durability the system has acceptable durability and can be expected to have a service life in excess of 30 years (see section 13). The BBA has awarded this Certificate to the company named above for the system described herein. This system has been assessed by the BBA as being fit for its intended use provided it is installed, used and maintained as set out in this Certificate. On behalf of the British Board of Agrément Date of First issue: 6 May 2015 Simon Wroe Claire Curtis-Thomas Head of Approvals Engineering Chief Executive Certificate amended on 25 August 2015 to include update to Figure 1. 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 tel: Bucknalls Lane fax: Watford clientservices@bba.star.co.uk Herts WD25 9BA Page 1 of 17
2 Regulations In the opinion of the BBA, Alumasc Ventilated Rendered/Acrylic Brick-Slip System for Timber Frame Buildings, if installed, used and maintained in accordance with 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 system is acceptable. See sections 4.2 and 6.3 of this Certificate. Requirement: B4(1) External fire spread The system meets Class 0 requirement. See sections 7.1 to 7.3 and 7.6 of this Certificate. Requirement: C2(b)(c) Resistance to moisture The system satisfies this Requirement. See sections 9 and 11.2 to 11.5 of this Certificate. Regulation: 7 Materials and workmanship The system is acceptable. See section 13 and the Installation part of this Certificate. The Building (Scotland) Regulations 2004 (as amended) Regulation: 8(1)(2) Durability, workmanship and fitness of materials The system can contribute to a construction satisfying this Regulation. See sections 12 and 13 and the Installation part of this Certificate. Regulation: 9 Building standards applicable to construction Standard: 1.1(a)(b) Structure The system is acceptable, with reference to clause (1)(2). See sections 4.2 and 6.3 of this Certificate. Standard: 2.6 Spread to neighbouring buildings The system can contribute to satisfying this Standard, with reference to clause (1)(2). See sections 7.1 to 7.3 of this Certificate. Standard: 2.7 Spread on external walls The system can contribute to satisfying this Standard, with reference to clause (1)(2). See sections 7.4 to 7.6 of this Certificate. Standard: 3.10 Precipitation The system will contribute to satisfying this Standard, with reference to clauses (1)(2) to (1)(2), and (1)(2) to (1)(2) See section 9 of this Certificate. Standard: 3.15 Condensation The system can satisfy or contribute to satisfying this Standard, with reference to clauses (1), (1), (1) and (1). See sections 9 and 11.2 to 11.5 of this Certificate. Standard: 7.1(a)(b) Statement of sustainability The product can contribute to satisfying the relevant requirements of Regulation 9, Standards 1 to 6, and therefore will contribute to a construction meeting a bronze level of sustainability as defined in this Standard. Regulation: 12 Building standards applicable to conversions All comments given for this system 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 Regulation: 23 (a)(i)(iii)(b) Fitness of materials and workmanship This system is acceptable. See section 13 and the Installation part of this Certificate. Regulation: 28 Resistance to moisture and weather The system will contribute to satisfying this Regulation. See sections 9.1 and 9.2 of this Certificate. Regulation: 29 Condensation The system is acceptable. See sections 9 and 11.2 to 11.5 of this Certificate. Regulation: 30 Stability The system is acceptable as set out in section 4.2 and 6.3 of this Certificate. Regulation: 36 External fire spread The system meets the Class 0 requirements. See sections 7.1 to 7.3 and 7.6 of this Certificate. Construction (Design and Management) Regulations 2015 Construction (Design and Management) Regulations (Northern Ireland) 2007 Information in this Certificate may assist the client, Principal Designer/CDM co-ordinator, designer and contractors to address their obligations under these Regulations. See section: 3 Delivery and site handling (3.1 and 3.4). Page 2 of 17
3 Additional Information NHBC Standards 2014 NHBC accepts the use of Alumasc Ventilated Rendered/Acrylic Brick-Slip System for Timber Frame Buildings, provided it is installed, used and maintained in accordance with this Certificate, in relation to NHBC Standards, Chapter 6.2 External timber framed walls, Chapter 6.3 Internal walls, Chapter 6.9 Curtain walling and cladding and Chapter 8.2 Wall and ceiling finishes. Technical Specification 1 Description 1.1 The Alumasc Ventilated Rendered/Acrylic Brick-Slip System for Timber Frame Buildings consists of Alumasc Render Carrier Board, a magnesium oxide core externally bonded with Alumasc Base Coat (ABC) and finished with ST Silkolit silicone render or Alumasc Acrylic Bricks or bonded with M.R. Scrim Adhesive and finished with M.R. S7 Dash Receiver for installation to suitably sheathed timber-frame buildings incorporating an appropriately drained and vented cavity (see Figure 1). 1.2 The system comprises: Render carrier board Alumasc Render Carrier Board a water and mould resistant magnesium oxide board. The boards are available with nominal characteristics of: Width (mm) 1200 Length (mm) 2400 Thickness (mm) 12 Density (kg m 3 ) 1050 Modulus of rapture (N mm 2 ) 17.7 transverse direction (dry conditions) 12.4 longitudinal direction (dry conditions). Mechanical fixings Ejot JT3 ST mm diameter self-drilling screws for metal and timber battens Ejot SH3 STS-5.0 x mm diameter self-tapping screws for timber battens. Basecoat Alumasc Base Coat (ABC) a cement-based, high polymer-modified basecoat, supplied in powder form. To be used with ST Silkolitt and Acrylic Bick-Slips finishes M.R. Scrim Adhesive a mixture of Portland cement, quartz sand and other additives, supplied in powder form. To be used with M.R. S7 Dashing Render. Reinforcement Alumasc Scrim Reinforcement a 1 m-wide alkali-resistant glassfibre mesh, with a mesh size of 6 mm by 6 mm weighing approximately 150 g m 2. Primer ST Primer a silicone primer containing fine quartz grains for use as a bonding aid and pre-coat. Brick-slips adhesive Alumasc Acrylic Brick-Slips Adhesive an organic-bound, water-based cement-free pre-mixed adhesive. Finishes Alumasc Acrylic Brick-Slips poly-acrylic slips containing quartz sands fillers, typically supplied in standard size of dimensions 65 mm by 215 mm by 4 mm with a nominal weight of 6 kg m 2. Available as straight brick-slips and corner brick-slips and in various colours. Other sizes are available on request from the Certificate holder ST Silkolitt a silicone finish, bonded, textured render supplied as a paste in three grades of grain size, 1.5 mm, 2.5 mm and 3.5 mm Spar-dash finish: M.R. S7 Dashing Render a polymer-modified fibre-reinforced cement-based mortar supplied as a powder to which water is added. Available coloured white, salmon, terracotta red, red, burgundy, gold, yellow, peach, grey, brown, light cream, cream or pink. Other colours are available to order M.R. Spar-Dash Aggregate available in a range of colours to suit the M.R. S7 Dashing Render. 1.3 The ventilated cavity is created using timber battens or vented galvanized top hat support rails. Page 3 of 17
4 1.4 Components used with the system but outside the scope of this Certificate include: a range of standard profiles at the wall base, end stops, reveal and corner mesh, expansion joints for vertical and horizontal applications, sill extensions and fire-break systems. These are available in stainless steel to BS EN : 2005, galvanized steel to BS EN : 2009 all of which can be powder coated to BS EN : 2005 and PVC-U extruded plastics to BS : All profiles must be approved and supplied by the Certificate holder timber battens/vented support rails breather membrane silicone sealant insect guard damp-proof membrane (dpm). Figure 1 Alumasc Ventilated Rendered/Acrylic Brick-Slip System for Timber Frame Buildings timber batten/galvanized rails(1) damp proof membrane(1) acrylic brick-slips mechanical fixing basecoat adhesive scrim reinforcement breather membrane(1) timber frame substrate(1) acrylic brick-slip system timber batten/galvanized rails(1) damp proof membrane(1) mechanical fixing topcoat render scrim reinforcement basecoat breather membrane(1) timber frame substrate(1) (1) Outside the scope of the Certificate. render system Page 4 of 17
5 2 Manufacture 2.1 The board is manufactured using inorganic substances and four layers of alkaline resistant glassfibre mesh, naturally cured using no energy. 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 Centre for Assessment Ltd (Certificate 02/1832). 3 Delivery and site handling 3.1 Boards are stacked on timber bearers, raised from the ground on a pallet. Each pallet pack incorporates the Certificate holder s name, product name, edge type, thickness, width, length, number of boards per pallet and pallet weight. 3.2 Boards must be stored flat in dry conditions indoors and be under cover on a level surface protected on site from contamination and weather at all times. Boards should not be leant upright for long periods of time. 3.3 Boards should always be lifted by two people and not dragged across each other to prevent unnecessary scratching or damage. The Certificate holder s instructions on site handling and storage must be followed. 3.4 The basecoat and render components must be stored in dry conditions, off the ground, and protected from frost at all times. Bags of unopened render have a shelf-life of 12 months when stored correctly. 3.5 The Acrylic Brick-Slip Adhesive must be protected from exposure to sunlight, frost and stored below temperatures of 30 C. Tubs of unopened adhesive have a shelf-life of 18 months when stored correctly. 3.6 Components are delivered to site in the quantities and packaging listed in Table 1. Each package bears the Certificate holder s name, product name and batch number. Table 1 Component packaging details Component Page 5 of 17 Quantity and package 12 mm Alumasc Render Carrier Board 58 boards per pallet, 2.1 tonnes per pallet Alumasc Base Coat (ABC) M.R. Scrim Adhesive Alumasc Acrylic Brick-Slip Adhesive Alumasc Acrylic Brick-Slips: Straight Corner ST Primer ST Silkolitt M.R. S7 Dashing Render M.R. Spar-Dash Aggregate Mechanical fixings Alumasc Scrim Reinforcement Assessment and Technical Investigations 25 kg bag 25 kg bag 20 kg tub 10 kg box 3.5 kg box 23 kg plastic tub 25 kg plastic tub 25 kg bag 25 kg bag boxed by manufacturer 1 m wide, 50 m rolls The following is a summary of the assessment and technical investigations carried out on Alumasc Ventilated Rendered/ Acrylic Brick-Slip System for Timber Frame Buildings. Design Considerations 4 General 4.1 The Alumasc Ventilated Rendered/Acrylic Brick-Slip System for Timber Frame Buildings is satisfactory for use as an external wall cladding in timber-frame buildings. 4.2 The timber frame substrate wall to which the system is fixed must be structurally sound and constructed in accordance with the requirements of the relevant national Building Regulations and Standards (see sections 4.3).
6 4.3 Timber stud walls and timber battens must be structurally sound, designed and constructed in accordance with BS EN : 2004 (Eurocode 5). Timber must be preservative treated in accordance with BS EN : The design must include: Alumasc Render Carrier Board as backing of the render system a ventilated and drained cavity system incorporating an insect guard to all ventilation openings effective detailing around window openings to ensure that wind-driven rain cannot penetrate to the hidden members in the surround and from the cavity an effective breather membrane on the inside, to ensure the timber frame structure is protected. 4.5 The system must only be applied above the damp-proof course (dpc) level and at a minimum of 150 mm above ground level. 5 Practicability of installation The system is designed to be installed by a competent builder, or a contractor, experienced with this type of system. 6 Strength and stability 6.1 The boards have adequate strength and can be used with the render system. 6.2 A suitably qualified and experienced individual must check the design and installation of the cladding system. 6.3 Design wind loadings should be calculated in accordance with BS EN : 2005 (Eurocode 1). Due consideration should be given to the higher-pressure coefficients applicable to corners of the building as recommended in this Standard. 6.4 The contribution of the board, insulation and render finish on the stability of the substrate is assumed to be negligible. The substrate wall, must be able to take the full wind actions and racking loads and be capable of sustaining the weight of the system. The adequacy of the substrate is outside the scope of this Certificate and must be verified by a suitably qualified and experienced individual. 6.5 For each wall panel, a partial safety factor of 1.3 and the values of modification factor k mod in Table 2 (of this Certificate) as defined in BS EN : 2004 (Eurocode 5), sections and respectively, are to be used to determined the values of design values of racking loads. Table 2 Values of modification factors k mod Load duration class Service class Class 1 Class 2 Class 3 Short-term actions Instant actions The characteristic pull-through resistance of Alumasc Render Carrier Board was calculated (by test) using a minimum safety factor of 3 in accordance with BS EN 1383 : 1999 for 4.8 mm by 42 mm self-drilling stainless steel screws (BMDW4842) and is given in Table 3 of this Certificate. Table 3 Characteristic pull-through resistance Board thickness (mm) 12 Plate diameter of anchor mm) 4.8 Characteristic pull-through resistance (1) (per anchor) (N) 1191 Factor of safety (2) 3.0 Design pull-through anchor resistance (N) 397 (1) Characteristic value in accordance with BS EN 1990 : 2002, Annex D7.2. (2) The safety factor of 3.0 is applied and based on the assumption that all s are subject to adequate quality control. 6.7 Tests and calculations carried out confirm that the design wind load resistance of the system is 5 kn m 2. This design wind load resistance result is valid provided the designer ensures the following: the characteristics of the mean Alumasc Render Carrier Board are: A1 non-combustible reaction to fire classification in accordance with BS EN : mm thickness minimum density of 1050 kg m 3 nominal tensile strength (perpendicular to plane) of 2.00 Nmm 2 in accordance with BS EN 319 : that the fixing of the support rail/timber batten to the substrate wall has adequate pull-out resistance for the calculated loads (outside the scope of this Certificate) and the examples are covered in Table 4 that the design of the timber frame and the support rail/timber batten must be such as to limit the mid-span deflections to L/200 and cantilever deflections to L/180 Page 6 of 17
7 that the vertical support rails/timber battens are no more than 600 mm centres apart and that fixings are at no more than 220 mm centres apart. 6.8 Typical characteristic pull-out strengths for the fixings listed in section 1.2 are given in Table 4; however, these values are dependent on the substrate. Fixings must be selected to suit the loads and substrate concerned. Table 4 Fixings typical characteristic pull-out strengths Fixing type Substrate Diameter (mm) Ejot JT3 ST mm Aluminium (g = 215 N mm 2 ) Timber Ejot SH3 STS-5.0 x 42 Timber 5 6 Effective anchorage depth (mm) Typical pull-out strength (kn) Impact resistance 6.9 Tests for resistance to hard and soft body impact, indicated that the system had adequate resistance to impact and therefore may be considered suitable for use in all Use Categories (1). (1) As defined in ETAG 004 : 2013, see Table 5. Table 5 Definition of Use Categories Use Category I II III Description A zone readily accessible at ground level to the public and vulnerable to hard body impacts but not subjected to abnormally rough use. A zone liable to impacts from thrown or kicked objects, but in public locations where the height of the ETICS 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. A zone not likely to be damaged by normal impacts caused by people or by thrown or kicked objects. 7 Performance in relation to fire 7.1 The reaction to fire classification for the external surface of the system in accordance with BS EN : 2007 or as defined in the national Building Regulations is shown in Table 6. Table 6 System fire classifications Rendering/ brick-slip system M.R. S7 Dashing Render + Dash Aggregate ST Silkolitt Alumasc Acrylic Brick-Slips Classification A2-s1, d0 7.2 For houses in Scotland and for all buildings in England, Wales and Northern Ireland, the system is suitable for use on or at any distance from, the boundary. 7.3 The system is restricted for use in buildings up to 18 metres in height. 7.4 For flats, maisonettes and non-domestic buildings in Scotland, the system is suitable only for use more than one metre from the boundary. 7.5 The calculations for unprotected areas may apply with the use of the system, dependent on the fire resistance characteristics of the wall. 7.6 To limit the risk of fire spread between floors in buildings subject to national Building Regulations, fire barriers must be incorporated in the cavity as required under these Regulations, but should not block essential ventilation pathways. Guidance on fire barriers can be found in BRE Report BR 135 : Proximity of flues and appliances When the insulation system is installed in close proximity to certain flue pipes, the relevant provisions of the national Building Regulations should be met: England and Wales Approved Document J Scotland Mandatory Standard 3.19, clauses (1)(2) to (1)(2) and (1)(2) (1) Technical Handbook (Domestic). (2) Technical Handbook (Non-Domestic). Northern Ireland Technical Booklet L. Page 7 of 17
8 9 Weathertightness 9.1 The system resists the passage of moisture and from weather. Any water collecting in the cavity due to rain or condensation will be removed by drainage and ventilation. 9.2 The air space between the back of the boards and the supporting substrate should be at least 25 mm wide (1). (1) Guidance on recommended cavity widths is given in NHBC Standards, Chapter 6.2 External timber framed walls and Chapter 6.9 Curtain walling and cladding. 10 Water absorption The water absorption of Alumasc Render Carrier Board is 8.6% when tested in accordance with BS EN 322 : Thermal conductivity and risk of condensation 11.1 The board has a thermal conductivity value of W m 1 K The relevant components of the system have a water vapour resistance such that, under the conditions likely to be found in dwellings in the United Kingdom, interstitial condensation should not occur within the wall If a system is to be used on the external walls of rooms expected to have continuous high humidity, care must be taken in the design of the rooms to avoid possible problems from the formation of interstitial condensation in the wall When using Alumasc Render Carrier Board, consideration must be given to the overall design to minimise the risk of condensation, and the recommendations contained in BS 5250 : Ventilation openings in the system should be at least mm 2 m 1 run of cladding. 12 Maintenance and repair 12.1 Periodic inspections are recommended to assess the need for cleaning, maintenance painting, localised repairs and element replacements, such as joints seals and fixings to ensure that ingress of water does not occur. Necessary repairs must be carried out immediately (see sections 12.2 and 12.3) Damaged areas must be repaired using appropriate materials and advice should be sought from the Certificate holder Damaged boards must be repaired or replaced as soon as is practicable, following the Certificate holder s instructions and observing all necessary health and safety regulations. 13 Durability 13.1 The durability and service life of the system will depend on the building location, immediate environment and intended use of the building Provided regular maintenance is carried out, as described in section 12.1 and in accordance with the Certificate holder s instructions, the system can be expected to have a service life in excess of 30 years when used in the normal climatic conditions found in the UK. Installation 14 Site survey and preliminary work 14.1 A pre-installation survey of the property must be carried out to determine suitability for treatment and any repairs necessary to the building structure before application of a system. 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, where required The survey should include tests conducted on the walls of the building by the Certificate holder or their approved installers (see section 15) to determine the pull-out tests for mechanical fixings for the appropriate substrate. An assessment and recommendation should be made 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 number of fixings are selected as per sections 6 and 16.13). The advice of the Certificate holder should be sought to ensure the proposed fixing pattern is sufficient On existing buildings, purpose-made window sills must be fitted to extend beyond the finished face of the system. New buildings should incorporate suitably deep sills. Page 8 of 17
9 14.4 All modifications and necessary repairs to the building structure are completed before installation commences. 15 Approved installers Application of the system, within the context of this Certificate, must be carried out by approved 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 system 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. 16 Procedure General 16.1 Installation of the system should be carried out strictly in accordance with the provisions of this Certificate and the Certificate holder s installation instructions The support system to which the render system is applied must be capable of transmitting its self-weight and the wind load to the structure. The adequacy of the structural frame must be verified by a suitably qualified engineer Movement joints must be incorporated into the system at the required locations identified by the building designer (see sections and 16.16). Existing movement joints should be continued through the system The breather membrane must be installed and properly overlapped in accordance with the instructions of the membrane manufacturer and the building designer For a drainage cavity, the steel rail or timber batten used is fixed directly into the structural frame and the board fixed to the battens/rails. The frame studs or cavity drainage battens/ rails should be at a maximum of 600 mm centres A ventilated cavity must be of a suitable specification (ie minimum of 25 mm width) created by timber battens or vented render-board support rails Alumasc Render Carrier Board should be dry during installation at temperatures of 5ºC or above Application of the render or brick-slip system must not be carried out at temperatures below 5 C or above 30 C, nor if exposition to frost is likely, and the coating must be protected from rapid drying. Weather conditions, therefore, should be monitored to ensure correct curing conditions The finished render system should be no thicker than 12 mm All window and door openings must be sealed strictly in accordance with the Certificate holder s installation instructions to ensure that they are weathertight (see Figures 6 and 7). Positioning and securing s The Alumasc vented base profile is secured to the external substrate above the dpc using the approved profile fixings at approximately 300 mm centres (see Figure 2). Page 9 of 17
10 Figure 2 Typical section of base detail acrylic brick-slip/render system cavity sheathing board with breather membrane timber frame substrate intumescent strips fire barriers PVC clip-on drip profile vent profile typical section of base detail The first run of s is positioned on the vented base profile, securely fixed to the rails/ battens using the project-specific fixing type (see section 1.2). The boards are fitted with the textured face out to improve the adhesion of the render to the board. Subsequent rows of boards are positioned so that vertical joints are staggered and overlap at the building corners (see Figure 3). Gaps of 3 mm to 4 mm are created between the boards using a suitable spacer. Alignment should be checked as work proceeds Mechanical fixings are applied through each to secure them during installation of the system. Mechanical fixings screws should be 20 mm in from the edge of the board and 40 mm from the end and a maximum of 220 mm screw spacing. The screws should not be over-tightened. Page 10 of 17
11 Figure 3 Typical board fixing pattern 2400 mm x 1200 mm 30 fixings per board 220 mm 6 fixings 600 ctrs 20 mm 40 mm 220 mm 200 (min) 15 mm 15 mm windows and openings Movement joints Expansion joints in the substrate must be continued through the system. The joint detail using purpose-made metal or PVC trims is illustrated in Figure Horizontal movement joints in accordance with BS EN : 2005 must be provided at every floor to accommodate vertical shrinkage in the timber frame and to follow movement joints in the substructure Vertical movement joints in accordance with BS EN : 2005 should be provided at a maximum of 15 m intervals. The actual spacing and position of the joints will be determined by the shape of the area to be rendered and should coincide with movement joints in the structure and allow for the same degree of movement. Page 11 of 17
12 Figure 4 Expansion joint detail brick-slip/render system batten vertical movement bead sheathing with breaather membrane timber frame substrate Rendering and Finishing This Alumasc Base Coat is prepared by mixing the contents of each 25 kg bag with 4.5 to 5.0 litres of clean water The basecoat is applied either by spray equipment or stainless steel trowel to the surface of the dry render carrier board to a minimum thickness of 5 mm. The mesh is bedded immediately into the basecoat with 75 mm minimum overlap at joints and must be in the upper third of the basecoat render. An additional slurry coat (1 mm to 2 mm) may be required to achieve the necessary smooth finish. Additional pieces of reinforcing mesh (250 mm by 500 mm) are used diagonally at the corners of openings, as shown in Figure 5. Corner details are reinforced using the corner beads. Figure 5 Reinforcement at openings glassfibre mesh Silicone Finish The drying period of any render will depend on the applied thickness and weather conditions; however, the basecoat must be left to harden for 3 to 5 days and any contaminants such as grease and chalking removed before the ST Primer is applied by roller or brush. The ST Primer is allowed to dry before application of the ST Silkolitt ST Silkolitt is supplied ready to use although a maximum of 2% clean water (250 ml maximum) can be mixed into the 25 kg tub prior to application. ST Silkolitt is applied by stainless steel trowel or spray equipment to the grain sizes of 1.5 mm, 2.5 mm or 3.5 mm. It can also be applied by spray equipment. The finish is textured in a circular motion with a plastic trowel until the desired effect is achieved. Page 12 of 17
13 16.21 To prevent the render from drying too rapidly, it should not be applied in direct sunlight and continuous surfaces should be completed without a break. Dashing Render Finish M.R. Scrim Adhesive is prepared by mixing each 25 kg bag with 4.5 to 5 litres of clean water and a bed coat is trowel-applied to the surface of s to a minimum thickness of 3 mm. Additional pieces of reinforcing mesh (250 mm by 500 mm) are used diagonally at the corners of openings, as shown in Figure 5. Corner details are reinforced using the corner beads The scrim adhesive must be allowed to harden and dry for between one and three days depending on the environment before application of the M.R. S7 Dashing Render M.R. S7 Dashing Render is prepared by mixing the contents of each 25 kg bag with approximately 5.0 to 5.6 litres of water. Care must be taken to ensure an even dispersion of the resin and fibre reinforcement One coat of M.R. S7 Dashing Render trowel-applied to a minimum thickness of 8 mm. For the M.R. S7 Dashing Render, a minimum of three bags of suitable spar-aggregate should be emptied into a clean wheelbarrow or tub and any excess water allowed to drain before being mixed thoroughly. While the M.R. S7 Dashing Render is still soft, the aggregate is thrown or sprayed onto the surface On completion, the surface must be checked to ensure that an even coverage of spar dash has been achieved. Where necessary, the aggregate should be lightly tamped to ensure a good bond. Acrylic Bricks-Slips The Alumasc Base Coat must be left to harden for three to five days and any contaminants such as grease and chalking removed before the ST Primer is applied by roller or brush colour matching ST Primer is applied by roller or brush to the entire surface of basecoat and left to dry, the colour to match the acrylic brick-slip adhesive Alumasc Acrylic Brick-Slip Adhesive is applied by a 5 mm notch trowel to the area of basecoat to receive the brick-slips Acrylic brick-slips are applied by hand in brick bond fashion, in line and level into adhesive. The brick-slips should be fully encapsulated in adhesive. Work is carried out from top to bottom lines Joints are normally 10 mm (minimum) wide. When pointing, a suitably-sized brush is used to smooth the acrylic adhesive into the joints and fully encapsulate the brick-slips. The adhesive is left to dry. All finishes After application, care must be taken to protect the render/brick-slips from direct sunlight, drying winds, rain, mist and cold (less than 5 C on a falling thermometer) to prevent the drying time from being too rapid or excessively prolonged The decorative finish should not be applied in wet weather, at temperatures below 5 C or when frost is expected. Freshly coated work should be protected from rain (minimum of one week for brick-slips) Care must be taken in the detailing of the system around openings and projections (see Figures 6 and 7). Page 13 of 17
14 Figure 6 Window head and sill details timber frame substrate sheathing board with breather membrane cavity window window sill vent profile acrylic brick-slip/ render system edge protection profile timber frame substrate PVC clip-on drip profile sheathing board with breather membrane vent profile window cavity render system Figure 7 Window jamb details edge protection profile with stop bead bedded on mastic corner bead brick slip/render system timber frame substrate sheathing board with breather membrane Page 14 of 17
15 Figure 8 External corner detail timber frame substrate breather membrane brick slip/render system timber batten corner bead At the tops of walls, the system must be protected by an adequate overhang or by an adequately sealed purpose-made coping. Figure 9 Parapet detail dpc skyline coping system vent profile edge protection profile timber frame substrate sheathing board with breather membrane brick slip/render system Page 15 of 17
16 Technical Investigations 17 Tests 17.1 Tests were carried out and the results assessed to determine: resistance to hard and soft body impacts thermal conductivity water vapour permeability resistance to heat/sun cycling An assessment was made of test data relating to: density bending strength modulus of elasticity in bending shear strength racking resistance resistance to organic growth dimensional stability water absorption water vapour permeability soft and hard body impact resistance to fire reaction to fire thermal conductivity The system s resistance to wind loading, mechanical resistance and stability was assessed. 18 Investigations 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. Bibliography BS : 1997 Rubber Tolerances for Products Dimensional Tolerances BS 5250 : 2011 Code of practice for control of condensation in buildings BS EN 319 : 1993 Particleboards and Fibreboards Determination of Tensile Strength Perpendicular to the Plane of the Board BS EN 322 : 1993 Wood-based panels Determination of moisture content BS EN : 2007 Durability of wood and wood-based products Preservative-treated solid wood Classification of preservative penetration and retention BS EN 1383 : 1999 Timber structures Test methods Pull-through resistance of timber fasteners BS EN 1990 : 2002 Eurocode Basis of structural design BS EN : 2005 Eurocode 1 : Actions on structures General actions Wind actions BS EN : 2004 Eurocode 5 : Design of timber structures General Common rules and rules for buildings BS EN : 2005 Stainless steels Technical delivery conditions for sheet/plate and strip of corrosion resisting steels for general purposes BS EN : 2009 Continuously hot-dip coated steel flat products Technical delivery conditions BS EN : 2005 Paints and varnishes Powder organic coatings for galvanized or sherardised steel products for construction purposes BS EN : 2007 Fire classification of construction products and building elements. Classification using test data from reaction to fire tests BS EN : 2005 Design, preparation and application of external rendering and internal plastering External rendering BS EN ISO 9001 : 2008 Quality management systems Requirements BRE Report (BR 135 : 2003) Fire Performance of External Insulation For Walls of Multi-Storey Buildings ETAG 004 : 2013 Guideline for European Technical Approval of External Thermal Insulation Composite Systems (ETICS) with Rendering Page 16 of 17
17 Conditions of Certification 19 Conditions 19.1 This Certificate: relates only to the product/system that is named and described on the front page is issued only to the company, firm, organisation or person named on the front page no other company, firm, organisation or person may hold or claim that this Certificate has been issued to them is valid only within the UK has to be read, considered and used as a whole document it may be misleading and will be incomplete to be selective is copyright of the BBA is subject to English Law Publications, documents, specifications, legislation, regulations, standards and the like referenced in this Certificate are those that were current and/or deemed relevant by the BBA at the date of issue or reissue of this Certificate This Certificate will remain valid for an unlimited period provided that the product/system and its manufacture and/or fabrication, including all related and relevant parts and processes thereof: are maintained at or above the levels which have been assessed and found to be satisfactory by the BBA continue to be checked as and when deemed appropriate by the BBA under arrangements that it will determine are reviewed by the BBA as and when it considers appropriate The BBA has used due skill, care and diligence in preparing this Certificate, but no warranty is provided In issuing this Certificate, the BBA is not responsible and is excluded from any liability to any company, firm, organisation or person, for any matters arising directly or indirectly from: the presence or absence of any patent, intellectual property or similar rights subsisting in the product/system or any other product/system the right of the Certificate holder to manufacture, supply, install, maintain or market the product/system actual installations of the product/system, including their nature, design, methods, performance, workmanship and maintenance any works and constructions in which the product/system is installed, including their nature, design, methods, performance, workmanship and maintenance any loss or damage, including personal injury, howsoever caused by the product/system, including its manufacture, supply, installation, use, maintenance and removal any claims by the manufacturer relating to CE marking Any information relating to the manufacture, supply, installation, use, maintenance and removal of this product/ system which is contained or referred to in this Certificate is the minimum required to be met when the product/system is manufactured, supplied, installed, used, maintained and removed. It does not purport in any way to restate the requirements of the Health and Safety at Work etc. Act 1974, or of any other statutory, common law or other duty which may exist at the date of issue or reissue of this Certificate; nor is conformity with such information to be taken as satisfying the requirements of the 1974 Act or of any statutory, common law or other duty of care. British Board of Agrément tel: Bucknalls Lane fax: Watford clientservices@bba.star.co.uk Herts WD25 9BA Page 17 of 17
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