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SAFETY & SECURITY
incorporation. Put simply, the relationship between a fire resistant closer and masonry should match those under which the test results were achieved. Cavity wall openings constructed to the varied tolerances shown above differ from those used by testing stations and are unlikely to replicate the test results. Testing stations qualify their test results relate only to the behaviour of the specimens of the elements of construction under particular conditions of test and do not reflect actual behaviour in fires. All openings in cavity walls should be formed squarely and uniformly, observing best practice to fulfil the objectives and requirements of Building Regulations Approved Document Part B.
Benefits of metal ties While core functionality relies on continuous interfacing, core longevity can be aided with the use of stainless steel metal ties as opposed to plastic ties securing the closer to the masonry. Metal ties that project through the closer body and continue into the actual protective core itself, can extend the period the resistant core is anchored and held in position when fire is attacking. Core continuous
Improved smoke protection
Series 61 (S61) is the latest smoke control damper to come to market from Gilberts. The single ‘door sized’ S61 compliments the company’s established, successful UKCA certifi ed and CE marked Series 60 (S60) smoke evacuation damper. The new S61 has been designed, tested and certifi ed to EN1366-2, EN1366- 10 and EN12101-8 in both open-to-closed and closed-to-open (with its associated grille attachment). It has attained ES classifi cation for integrity and smoke in air leakage tests, exceeding current legislative requirements and guidance. As its counterpart Series 60, S61 is manufactured from galvanised steel and will provide up to 120 minutes’ smoke and fi re integrity. Providing up to 1 m2 geometric free area within a 800 mm x 1,920 mm opening list size, S61 delivers a unit specifi cally to suit mechanically ventilated smoke shafts, with its enhanced air leakage reduction. Front access actuators and grille alignment brackets further simplify installation, operation and maintenance. All Gilberts’ products – standard lines and bespoke solutions – are designed, developed, manufactured and tested in accordance with BS EN ISO 9001:2015 quality standard.
01253 766911
info@gilbertsblackpool.com ADF10_Gilberts_Safety & Security - Fire
Protection_DPR.indd 1 05/10/2022 14:04
interfacing and core retention being the objectives. The building fabric should be constructed so that there are ‘no reasonably avoidable gaps within various elements, at the joints between elements, and at the edges of elements such as those around window and door openings’, as stipulated within L1A 5.9.
A site agent of many years standing perceptively summed up a parallel situation; “When you buy a new car, the manufacturers often claim a number of miles per litre, and I do not doubt such a figure is honestly produced, albeit dependent on a featherlight foot on the accelerator, well inflated tyres etc. Real everyday driving is different.” Fire testing establishments and bodies such as the BBA quite understandably do not provide warranties. It is down to those constructing the building to aspire to the highest standards to get it right. While one continues to witness variable masonry tolerances, one questions whether building envelope fire resistance will actually provide the intended level of protection in the event of a serious fire? Compliant construction should leave nothing to chance.
John Shillabeer is director at Cavity Trays
WWW.ARCHITECTSDATAFILE.CO.UK
ADF OCTOBER 2022
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