Glidevale Ltd - Reflect on thermal performance
 Clarification of how to utilise low emissivity
technology to improve a building’s thermal performance in line with
current- and future- regulations, is explained in a new CPD seminar
developed by Glidevale Ltd.
“Developments in materials technology, amendments to regulations and
the increasing pressure to achieve zero carbon structures are
combining to change the way the industry specifies and builds.
Further changes are on the way: more stringent Building Regulations
Part L are expected in both 2010 and 2013, and all new housing is
targeted at being zero carbon by 2016. Low emissivity is ‘buzz’
terminology today, particularly in wall construction, because of its
impact on a building’s thermal performance, but how many architects
and builders fully understand the principles and diversity of
application?” asks Neil Rideout, Glidevale Technical Director. “The
technology can make a significant, positive impact on a building’s
thermal performance, not only in walls, but in floors and roofs, and
has added benefits for the builder: it can reduce material costs and
accelerates build speed.”
The CPD explains how reflective/low emissivity technology works in
timber frame and block walls, floors, and warm roofs, outlining how
the building envelope can be designed, specified and constructed to
optimise its thermal efficiency. The seminar does not enter the
controversy surrounding thermal performance claims for multifoil
insulants, but follows guidance of BS EN 6946: 1997 and BR443:2006
Conventions for U Value Calculations. It also recommends the use of
independently certified products as advocated by the NHBC following
tried and tested methods.
BRE certified Protect TF200 Thermo reflective low emissivity
breather membrane yields a 170% thermal improvement over a
conventional airspace. In timber frame walls with a 140mm stud, the
introduction of a reflective breather membrane such as Glidevale’s
Protect TF200 Thermo in place of a standard breather membrane can
improve thermal performance to 0.26W/m2K from 0.30W/m2K.
The further addition of BRE certified Protect VC Foil reflective low
emissivity vapour control layer- equivalent to at least 34mm of
mineral wool- creates a low emissivity cavity that achieves a U
value of 0.22W/m2K in timber frame; in block construction, 0.24W/m2K
is attainable.
The seminar also addresses the use of low emissivity membranes in
warm roof construction, ahead of regulatory changes which Glidevale
predicts could require warm roofs to achieve a U value of 0.16W/m2K
against the current 0.25W/m2K. Glidevale’s figures show inclusion of
Protect VC Foil reduces insulation thickness by 40mm and costs by
15%, whilst attaining a U value for the roof of 0.16W/m2K.
Email:
info@glidevale.com
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Arundel Jones Associates Ltd
Hill Farm, Linton Hill, Maidstone, Kent ME17 4AL
Tel : 01622 745333
news@buildingdesign.co.uk
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