WINDSTOPPER EXTREME
13Pages

Cembrit Holding A/S Sohngaardsholmsvej 2 Aalborg 9000 Denmark Tel: +45 99 37 22 22 e-mail: info@cembrit.com website: www.cembrit.com SHEATHING BOARDS WINDSTOPPER EXTREME This Agrément Certificate Product Sheet(1) relates to Windstopper Extreme, fibre-cement boards for use externally as sheathing boards to new and existing buildings, providing temporary weather protection prior to over-cladding with a permanent façade rainscreen cladding. The boards can be used structurally when applied to steel-frame substrate walls. The boards are non-structural when applied to timber-frame substrate walls, providing racking resistance where required. (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 — when used as sheathing boards, the boards will contribute to the racking resistance of walls (see section 6). Performance in relation to fire — the boards have a reaction to fire classification of A2-s1, d0 to BS EN 13501-1 : 2018 (see section 7). Resistance to moisture — the boards have adequate moisture resistance (see section 8). Durability — provided that all joints between the boards are sealed and fixings are finished flush to the surface of the boards, Windstopper Extreme boards may be exposed for up to 12 months under normal periods and conditions of wind, rain, and heat exposure, prior to the rainscreen cladding finish being installed (see section 12). The BBA has awarded this Certificate to the company named above for the products described herein. These products 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 Agrement Date of First issue: 8 April 2021 Hardy Giesler Chief Executive Officer 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 www.bbacerts.co.uk Readers MUST check the validity and latest issue number of this Agrément Certificate by either referring to the BBA website or contacting the BBA directly. Any photographs are for illustrative purposes only, do not constitute advice and should not be relied upon. British Board of Agrément Bucknalls Lane Watford Herts WD25 9BA

Regulations In the opinion of the BBA, Windstopper Extreme, 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: Comment: Internal fire spread (structure) The boards can contribute to satisfying this Requirement. See section 7.1 of this Certificate. Regulation:...

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 sections: 3 Delivery and site handling (3.5) and 14 General (14.3 to 14.5) of this Certificate. Additional Information NHBC Standards 2021 In the opinion of the BBA, Windstopper Extreme, if installed, used and maintained in accordance with this Certificate, can satisfy...

Ancillary items 1.5 Components specified for use with the boards, but outside the scope of this Certificate, include: • • • • • • • steel-frame — light gauge metal frame with vertical studs at 600 mm maximum centres timber-frame — timber studs fixed vertically at 600 mm maximum centres breather membrane – in line with BS 5250 : 2011, see section 8.2 of this Certificate insulation sub-frame cavity external cladding or finishes. 2 Manufacture 2.1 The raw materials of ordinary Portland cement, cellulose, mica, and polyvinyl acetate (PVA) are mixed in a controlled process and gathered on a...

3.6 The boards should be carried on edge, not flat. Figure 2 Site handling Assessment and Technical Investigations The following is a summary of the assessment and technical investigations carried out on Windstopper Extreme. Design Considerations 4 Use 4.1 Windstopper Extreme boards are for use as structural sheathing boards on the outer face of steel-frame external walls. The boards are for use as non-structural sheathing boards on the outer face of timber-frame external walls, and can provide racking resistance to timber-frame external walls where required. The boards are supported at 600...

6.4 The wind actions on the wall should be calculated in accordance with BS EN 1991-1-4 : 2005 and its UK National Annex. Special consideration should be given to locations with high wind load coefficients as additional fixings may be necessary. In accordance with BS EN 1990 : 2002, it is recommended that a partial load factor of 1.5 is used to determine the design wind load to be resisted by the boards. 6.5 The boards were tested for dynamic wind load resistance to steel in accordance with EAD 090062-00-0404. The design wind load resistance value, evaluated by applying a partial load...

Table 4 Definition of Use Categories (reproduced from EAD 090062-00-0404. Table G.2) Use Category I 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 kit 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....