Knauf Insulation has launched Crown® Rafter Roll 32 in response to
demands for the ideal insulation material for warm roofs and loft
conversions. Its exceptionally low thermal conductivity of just
0.032 W/mK - it's the best performing glass mineral wool product in
the Knauf range - means that pitched roof thermal insulation
targets can be successfully achieved with the insulation material
being restricted to just the space between rafters.
Using the space in a pitched roof is a cost effective way of
increasing the usable floor area of a property. Many new homes are
now built with a 'room in the roof' and loft conversions have
become a popular way of increasing living space in existing
properties and enhancing their value.
But creating a warm roof usually means that sloping sections of
roof have to be insulated and it is these elements that often
present the greatest challenge to meeting tough thermal insulation
targets. The Building Regulations require an Elemental U-value of
0.20 W/m2K for new pitched roofs or, depending on geographic
location, between 0.20 W/m2K and 0.35 W/m2K for conversions.
Although there are a number of different ways of meeting them, the
ideal - in order to maximise room dimensions - is to keep the
insulation material restricted to the space between adjacent
rafters.
Crown® Rafter Roll 32 is supplied in roll form for easy storage and
handling but has the same characteristics as a semi-rigid slab of
glass mineral wool insulation. The rolls are offered in three
thicknesses - 75mm, 85mm and 100mm - and, depending on this, are
either 5.4m or 2.7m long. Roll width is a standard 1200mm which
means it can be cut to fit between rafters at either 400mm or 600mm
centres. Even in its roll form the product is very easy to cut
using just a hand saw and installation is equally as quick, simple
and effective: its semi-rigid nature allows it to friction-fit
between the rafters and its 'scrunchiness' overcomes timber
variations and prevents air gaps.
But the outstanding feature of Crown® Rafter Roll 32 is its
exceptionally low thermal conductivity of just 0.032 W/mK. This
means, for example, that a 170mm thickness (two layers of the 85mm
thick roll) between rafters at 600mm centres will achieve an
Elemental U-value of 0.20 W/m2K and a 185mm thickness will achieve
the same for rafters at 400mm centres.
Although the big benefit of Crown® Rafter Roll 32 is keeping the
insulation between the rafters, it also provides other important
insulation properties. Glass mineral wool is, of course, a highly
effective acoustic insulation material and is also totally
non-combustible; a fact recognised by it having a Euroclass A1 fire
classification, the highest rating possible.
"Crown Rafter Roll 32 represents an ideal and total insulation
solution for creating warm pitched roofs," said John Gaunt, Knauf
Insulation's Market Manager, Building and Construction, "It has an
outstanding thermal performance, excellent acoustic performance, is
non-combustible, is easy to work with and can be kept between the
rafters - what more could you possibly want!"
Further details are available in two new Knauf Insulation
brochures: Pitched Roofs: New Build and Upgrade and Loft
Conversions. To obtain copies, please call 08700 668 660 or e-mail
info@knaufinsulation.com quoting ID: KR17804.
® Registered Trademark of Knauf Insulation
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