DESIGN PROCESS
DESIGN CHECKLIST REQUIREMENTS Designers should provide the following information to the through-wall manufacturers, including plans, elevations and sections relevant to the project: • Reaction to fire classification to BS EN 13501-1 • Regulation 7 • Fire resistance – if different values for different directions of attack are required, please specify • Acoustic value – dB R w or R w +Ctr • Target U-value • Airtightness – Part L • Cladding type • System permissible thickness
standards where an independent test report will be produced. Designers should satisfy themselves that the specified products have evidence of compliance, with test reports from the relevant tests listed in this document or using third-party certification schemes. There are a number of industry-recognised third- party certification schemes that cover a wide range of through-wall systems. Independent third-party certification schemes formally assure the performance, quality, reliability and traceability of performance in systems and products. Products may also have third-party certification, which involves regular retesting factory controls and a scope of application. THE FOUR Cs CONSIDER the implications of where the product or system is being installed, its interface with the structure and other elements, if there are any through penetrations, partial penetrations or intersections. CLARIFY the potential impact of another product intersecting, penetrating or interfacing and what test evidence is available/required. This should be with the system owner and other relevant third- party suppliers. CHECK what test evidence/third-party certification is required, with the design team and authority having jurisdiction. CONFIRM that the test evidence provided is relevant to that situation, is in date and addresses the system’s interfaces and parameters. It should also satisfy the requirements of the Building Regulations, standards, guides and the principal designer. Where current test evidence is not available, a suitably qualified and approved person (as defined in Section 6 – Requirement of assessors and reviewers of the PFPF Guide to Undertaking Technical Assessments of Fire Performance of Construction Products Based on Fire Test
• Minimum and maximum SFS heights • Primary structure (concrete/steel etc)
• Method of fire protection intended for the steel • Plan to maintain internal fire compartmentation • Additional performance and construction requirements from warranty providers such as the National House Building Council and Premier.
THE FOUR Cs PROCESS
The Four Cs process ensures that the products and systems being designed for the project have evidence of compliance relating to the specific detailing and interfaces. Clear evidence of performance should be obtained for all products and systems on a project as early as possible in the design stage. Products and systems are tested in isolation of the building fabric, intersections and interfaces. Systems that are an inherent part of a building’s fabric will have other products, systems and materials that intersect, penetrate and interface with them. Where this occurs, the designer and person responsible for the purchasing should use the Four Cs process below to clarify that they have the evidence to prove that when these interfaces occur, all the products will perform as required within the parameters of the required design. To show compliance, products and systems are independently tested in UKAS or equivalent test laboratories and facilities to relevant and referenced international (ISO), European (EN) and British (BS)
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