FEATURE FIRE PROTECTION Clifton Hill House, University of Bristol
Give it the Right Fire Treatment Intumescent paints are an important element of passive fire protection and can be applied to a variety of combustible building materials in order to bring them into compliance with fire regulations.
I
ntumescent paint reacts when
elements include frames, staircases, floors,
or 60 minute fire protection and insulation
its temperature attains or
ceilings, cladding, and doors made of wood
according to BS476 Part22. Up to 60 minutes
exceeds 120°C, and the process
or wood derivative. Intumescent paint can
fire protection achieved on open joists and
results in a soft charring effect
be applied directly onto the surface of
floorboards according to BS476 Part 20.
at its surface (which insulates
timber structures, either by brush, roller, or
90-minute fire rating achieved on timber
and reduces transmission of heat into the
spray. There are several varieties of clear
mouldings and carcasses according to BS476
substrate) and the release of water vapour
intumescent paint that can be used on wood
Part 20. Tested on a range of timber types,
(which helps to cool the substrate).
in order to preserve their appearance. One
including plywood and MDF, complying with
example of intumescent paint is the patented
BS476 Parts 6 & 7, Classes 0 & 1 (Spread of
HW coating system from Envirograf.
Flame). Tested to European Standard EN1364-
When timber and wood surfaces are exposed to flames, the intumescent expands
1, achieving 66 minutes integrity. Complies
to create a fireproof layer on the substrate. A range of timber substrates can be coated with intumescent paint in order to comply with fire regulation standards. These building
Timber Construction Magazine
Fire Test Performance
with Classification B/S1/d0 of European
Tested on a wide range of wooden doors, achieving 60 minutes integrity and either 30 Autumn 2021
26
Standard EN13823, single burn test (SBI) and EN11925-2 (ignitability).
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