DEFINITIONS
1 Passive Fire Protection Forum (PFPF) Guide to Undertaking Technical Assessments of Fire Performance of Construction Products Based on Fire Test Evidence 2 BS 5250 3 Firestopping of Service Penetrations – Best Practice in Design and Installation
U-value 6 U-value (or thermal transmittance co-efficient) is a measure of how much heat will pass through one square metre of a structure when the temperatures on either side of the structure differ by 1ºC (expressed in W/m2K). Note: the lower the U-value, the more effective it is at preventing heat transfer. Relevant building Extract from Fire Safety for Relevant Buildings - Guidance Notes: “(a) a “relevant building” means a building with a storey (not including roof-top plant areas or any storey consisting exclusively of plant rooms) at least 18 metres above ground level and which— contains one or more dwellings; contains an institution; or contains a room for residential purposes (excluding any room in a hostel, hotel or boarding house); and (b) “above ground level” in relation to a storey means above ground level when measured from the lowest ground level adjoining the outside of a building to the top of the floor surface of the storey.” labcwarranty.co.uk/fire-safety-for-relevant-buildings- guidance-notes/ Weather and airtight membrane A flexible seal used between windows and the external wall construction; sometimes manufactured from ethylene propylene diene monomer (EPDM). EPDM is not suitable for use in a relevant building because it does not meet the minimum B-s3, d0 classification.
4 BS EN 13381-8:2013 5 BS EN 13501-2:2016 6 Scottish Building Standards handbook
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