MASONRY COATING WETHERTEX PLIOLITE-BASED COATING HIGH RELIEF

Transcription

1 Wetherby Stone Ltd T/A Wethertex UK Bleakhill Way Mansfield Nottinghamshire NG18 5EZ Tel: Fax: website: APPROVAL INSPECTION TESTING CERTIFICATION TECHNICAL APPROVALS FOR CONSTRUCTION Agrément Certificate 95/3171 Product Sheet 1 MASONRY COATING WETHERTEX PLIOLITE-BASED COATING HIGH RELIEF PRODUCT SCOPE AND SUMMARY OF CERTIFICATE This Certificate relates to Wethertex Pliolite-based Coating High Relief, a plastic rendering for use on a variety of external substrates. AGRÉMENT 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 Permeability the product provides good resistance to water penetration (see section 5). Performance in relation to fire the product is not non-combustible and has a Class 1 or medium risk rating as defined in the national Building Regulations (see section 6). Durability in normal external conditions, when correctly applied to the detailed substrates, the product will perform satisfactorily for more than 15 years (see section 8). The BBA has awarded this Agrément Certificate to the company named above for the product described herein. The product 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: 16 October 2009 Simon Wroe Greg Cooper Originally certificated on 18 July 1995 Head of Approvals Materials 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 tel: Bucknalls Lane fax: Garston, Watford mail@bba.star.co.uk Herts WD25 9BA 2009 website: Page 1 of 6

2 Regulations In the opinion of the BBA, Wethertex Pliolite-based Coating High Relief if used in accordance with the provisions of this Certificate, will meet or contribute to meeting the relevant requirements of the following Building Regulations: The Building Regulations 2000 (as amended) (England and Wales) Requirement: B4(1) Requirement: Regulation 7 External fire spread The product applied to a non-combustible substrate has a Class 1 surface and its use on these substrates may be restricted by this Requirement. See sections 6.1 and 6.2 of this Certificate. Materials and workmanship The product is an acceptable material. See section 8.1 and the Installation part of this Certificate. The Building (Scotland) Regulations 2004 (as amended) Regulation: 8(1)(2) Fitness and durability of materials and workmanship The product can contribute to a construction meeting this Regulation. See sections 7.1, 8.1 and the Installation part of this Certificate. Regulation: 9 Building standards construction Standard: 2.6 Spread to neighbouring buildings Standard: 2.7 Spread on external walls The product is not classified as non-combustible and it is therefore restricted by this Standard, with reference to clauses (1)(2), (1), (2), (1)(2) and 2.A.7 (1) of these Standards. See sections 6.1 and 6.2 of this Certificate. Regulation: 12 Building standards conversions All comments given for the product under Regulation 9, 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) 2000 (as amended) Regulation: B2 Fitness of materials and workmanship The product is an acceptable material. See section 8.1 and the Installation part of this Certificate. Regulation: B3(2) Suitability of certain materials The product is acceptable. See section 7.1 of this Certificate. Regulation: E5(a) External fire spread The use of the product on a non-combustible substrate may be restricted by this Regulation. See sections 6.1 and 6.2 of this Certificate. Construction (Design and Management) Regulations 2007 Construction (Design and Management) Regulations (Northern Ireland) 2007 Information in this Certificate may assist the client, CDM co-ordinator, designer and contractors to address their obligations under these Regulations. See sections: 1 Description (1.2) and 2 Delivery and site handling (2.1, 2.3 and 2.4). Non-regulatory Information NHBC Standards 2008 NHBC accepts the use of Wethertex Pliolite-based Coating High Relief when installed and used in accordance with this Certificate, in relation to NHBC Standards, Chapter 8.5 Painting and decorating. Zurich Building Guarantee Technical Manual 2007 In the opinion of the BBA, there are no requirements in the Zurich Building Guarantee Technical Manual relating to Wethertex Pliolite-based Coating High Relief. Technical Specification 1 Description 1.1 Wethertex Pliolite-based Coating High Relief is a plastic rendering suitable for external use on the substrates defined in section 3. It is available in a range of colours, details of which are available from the Certificate holder. 1.2 The product is based on a solution of Pliolite resin in hydrocarbon solvent and contains pigments, extenders, biocides and other additives. Page 2 of 6

3 1.3 The product is manufactured by a batch-blending process. Quality control is exercised on the basic raw materials, during the production process, and on the final product. 1.4 Wethertex Polymer Render, a polymer cement mix, is used to prepare a brickwork surface prior to application of Wethertex Pliolite-based Coating High Relief. 1.5 Wethertex Solvent-based Stabiliser is used to treat porous or chalking masonry surfaces. 2 Delivery and site handling 2.1 The product is supplied in 25 kg metal containers bearing the marketing company s name, batch number, and the BBA identification mark incorporating the number of this Certificate. 2.2 The product has a shelf-life of two years. Degradation of the material in the container does not occur but there may be some settling. Partly-used containers can be reused provided they are airtight. 2.3 Wethertex Pliolite-based Coating High Relief and Wethertex Solvent-based Stabiliser are flammable with flashpoints of 40 C and 43 C respectively and must be stored in a cool place away from naked flames. 2.4 The products have the classifications under The Chemicals (Hazard Information and Packaging for Supply) Regulations 2002 (CHIP3) given in Table 1. Table 1 CHIP3 classification Product Wethertex Pliolite-based Coating High Relief Wethertex Polymer Render Wethertex Solvent-based Stabiliser Classification Flammable None Flammable Assessment and Technical Investigations The following is a summary of the assessment and technical investigations carried out on Wethertex Pliolite-based Coating High Relief. Design Considerations 3 Use 3.1 Wethertex Pliolite-based Coating High Relief is a plastic rendering suitable for application by trowel, roller or spray to external walls, ceilings and soffits of the following materials: (a) in-situ or precast concrete (dense and lightweight) (b) concrete blockwork (dense and lightweight) (c) brickwork (after the application of Wethertex Polymer Render) (1) (d) renderings (sand/cement and sand/lime cement) (e) calcium silicate or fibre-reinforced cement sheets or insulation boards (f) suitably sound previously painted surfaces (g) surfaces (a) to (e) treated with Wethertex Solvent-based Stabiliser. (1) In new construction, the brick/blockwork manufacturer s recommendations on overcoating should be followed. 3.2 Following application, the product can be given a textured or stippled finish using such tools as a roller, comb, sponge or spatula. 3.3 The assessment on external walls covers the face of the wall above dpc level, and excludes horizontal surfaces such as ledges, sills and copings. Parapet walls must have effective dpc s in the correct positions. 3.4 The effect of pretreatment or an existing coating on the surfaces fire properties is indicated in section 6. 4 Practicability of installation The product can be applied by operatives familiar with this type of product. 5 Permeability 5.1 When tested using the dynamic sweep gas method to BS 7406 : 1991 (ISO 9932 : 1990) a sample of the product applied to fibre-reinforced cement gave a water vapour resistance of 12.8 MNsg The coating has a good resistance to water penetration and considerably reduces the amount of water that can be absorbed by the substrate during rain. Page 3 of 6

4 6 Performance in relation to fire 6.1 A sample of white product applied without pretreatment to the non-combustible substrates listed in section 3.1(a) to (e) and tested to BS : 1971, gave a Class 1 surface. 6.2 This performance may not be achieved by other colours of the product, nor if it is applied over a previous paint coating. The designations of other colours or material combinations should be confirmed by: England and Wales Test or assessment in accordance with Approved Document B, Appendix A, Clause 1 Scotland Test to conform with the Table to Annex 2C (1) or 2E (2) of Regulation 9 (1) Technical Handbook (Domestic). (2) Technical Handbook (Non-Domestic). Northern Ireland Test or assessment by a UKAS accredited laboratory or an independent consultant with appropriate experience. 7 Maintenance 7.1 The coating can withstand frequent washing without deterioration. A soft bristle brush should be used. 7.2 For re-coating, normally it is not necessary to remove the existing coating completely. The surface should be prepared by washing or brushing, and may be re-coated with Wethertex Pliolite-based Coating High Relief or a suitable masonry paint. Redecoration with oil, gloss or cement paints is not recommended. 8 Durability 8.1 In normal external conditions, Wethertex Pliolite-based Coating High Relief, properly applied to the substrates listed in section 3, will have good colour stability and will perform satisfactorily for more than 15 years. 8.2 In industrial atmospheres the coating may become dirty and, to maintain its appearance, it may be necessary to clean or re-coat more frequently. 8.3 The product has good colour stability but there will be a gradual slight change in colour. The coating will be discoloured by water runs so care must be taken to ensure that the normal architectural details for shedding water are present and functioning. 8.4 The coating may be abraded, particularly at ground-floor level, by carelessness in use, eg if bicycles or gardening tools are repeatedly leant against it. Installation 9 General 9.1 Application of Wethertex Pliolite-based Coating High Relief should be carried out generally in accordance with the relevant Clauses of BS 6150 : 2006 and BS : The product should not be applied in wet weather, at temperatures below 5 C, or when frost is expected. 9.3 The coverage achieved will depend on the texture and suction of the substrate; normally it will be approximately 2.5 kgm Preparation 10.1 The substrates listed in section 3 should be sound, free from dirt and grease and reasonably dry. Joints in new brickwork and blockwork should be finished flush. Mortar joints in existing work should be repointed if necessary, and allowed to cure. Defects should be filled with Wethertex Polymer Render Wethertex Polymer Render is mixed and applied to brickwork by trowel as a 6 mm thick coat, generally in accordance with BS EN : The product can bridge hairline cracks in the substrate but larger cracks should be filled and patched in accordance with the Certificate holder s instructions Organic growth should be removed mechanically from old surfaces, and a suitable fungicide applied and allowed to dry. Remaining loose material should be removed using a stiff brush If the substrate is chalking, absorbent, friable, or has been decorated previously, any loose material should be removed with a stiff brush. A priming coat of Wethertex Solvent-based Stabiliser should be applied and allowed to dry overnight before the coating is applied. Page 4 of 6

5 11 Application 11.1 The product should be stirred before use and applied by trowel, roller or spray. The manufacturer can advise on suitable types of spray equipment To avoid patchiness due to drying edges, work should be carried to an internal or external angle or to a feature. Alternatively, joints may be made to coincide with features such as downpipes. On large unbroken areas, sufficient operatives should be available to maintain a flowing edge A patterned finish can be achieved in a separate operation after application (see section 3.2) The drying time varies, depending on the substrate and atmospheric conditions but, under normal conditions, will take from three to four hours. During this period the coating has some tolerance to rain. Technical Investigations The following is a summary of the technical investigations carried out on Wethertex Pliolite-based Coating High Relief. 12 Tests 12.1 An examination was made of test data relating to samples applied to various primed and unprimed substrates, tested in accordance with MOAT No 24 : 1983 to determine: extensibility water vapour permeability resistance to artificial weathering resistance to impact resistance to water immersion resistance to alkali immersion resistance to abrasion resistance to soiling An examination was made of existing data relating to: resistance to algal growth surface spread of flame. 13 Investigations 13.1 The manufacturing process was examined, and the raw material specifications, formulations and quality control procedures were established A postal user survey was carried out to establish the performance of the product in service. Bibliography BS : 1997 Fire tests on building materials and structures Method of test to determine the classification of the surface spread of flame of products BS 6150 : 2006 Painting of buildings Code of practice BS 7406 : 1991 Methods for determination of water vapour transmission rate of sheet materials (paper and board) by dynamic sweep and static gas methods BS : 1989 Workmanship on building sites Code of practice for decorative wallcoverings and painting BS EN : 2005 Design, preparation and application of external rendering and internal plastering External rendering ISO 9932 : 1990 Paper and board Determination of water vapour transmission rate of sheet materials Dynamic sweep and static gas methods MOAT No 24 : 1983 Directives for the Assessment of Plastic Renderings Page 5 of 6

6 Conditions of Certification 14 Conditions 14.1 This Certificate: relates only to the product/system that is named and described on the front page is granted only to the company, firm or person named on the front page no other company, firm or person may hold or claim any entitlement to this Certificate 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 and documents referred to in this Certificate are those that the BBA deems to be relevant at the date of issue or re-issue of this Certificate and include any: Act of Parliament; Statutory Instrument; Directive; Regulation; British, European or International Standard; Code of Practice; manufacturers instructions; or any other publication or document similar or related to the aforementioned This Certificate will remain valid for an unlimited period provided that the product/system and the manufacture and/or fabrication including all related and relevant 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 In granting this Certificate, the BBA is not responsible for: 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 individual installations of the product/system, including the nature, design, methods and workmanship of or related to the installation the actual works in which the product/system is installed, used and maintained, including the nature, design, methods and workmanship of such works Any information relating to the manufacture, supply, installation, use and maintenance 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 and maintained. It does not purport in any way to restate the requirements of the Health & Safety at Work etc Act 1974, or of any other statutory, common law or other duty which may exist at the date 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. In granting this Certificate, the BBA does not accept responsibility to any person or body for any loss or damage, including personal injury, arising as a direct or indirect result of the manufacture, supply, installation, use and maintenance of this product/system. British Board of Agrément tel: Bucknalls Lane fax: Garston, Watford mail@bba.star.co.uk Herts WD25 9BA 2009 website: Page 6 of 6