Space
ROOF SPACE
During 1996, Laing Homes made an extra profit of £10,000-£17,000
per house by turning the loft space in its four and five bedroom
houses into living space.
“The customer gets an extra 25% floor
space for about 10% on the price”.
Source: Ian Randall – Southern Area Managing Director, Laing
Homes. Building Homes. December 1996.
The Kingspan TEK Building System is ideally suited to creating
useable room-in-roof space due to its ability to create the maximum
unobstructed area. Room-in-roof construction is becoming ever more
popular. People are driven to this concept by various forces including:
- the demands of PPG3 / Bacon recommendations reducing footprint
size thus forcing builders to build up or down to put floor area
into houses; and
- to fully utilise all of
the potential for space that a building has, to allow for extra
space for a home office, guest rooms, children’s play rooms etc.
as lifestyles change, or simply a warm storage area in the roof.
Kingspan TEK Structural Insulated Roof Panels are manufactured
up to 7.45m long and with the use of intermediate purlins any size
of roof can be constructed with the Kingspan TEK Building System.

The Kingspan TEK Building System eliminates the need for expensive
attic trusses or trussed rafters which can be time consuming, difficult
to erect and costly to insulate.
For a full discussion of the benefits of room-in-roof construction
please refer to the Kingspan Insulation publication “Pitched Roofing
and the use of Rafter Level Insulation” available from the numbers
shown in the Contact Us section.
FLOOR SPACE
The
Kingspan TEK wall to achieve a U-value of 0.18 W/m²K can
be as little as 194.5mm thick. In comparison a full fill masonry
cavity wall to achieve the same U-value will have to have a wall
405 mm thick (180 mm rock wool full fill / 100 mm dense block /
12.5 mm plasterboard on dabs). A timber frame wall to achieve the
same U-value will have to have a wall 448mm thick (breather membrane
/ 12 mm OSB / 270 mm glass fibre quilt between 270 mm studs / 12.5
mm vapour check plasterboard on dabs).
This means that the Kingspan TEK Building System gives you
more floor space for the same external dimensions. Ideal when considering
compliance with the housing densities demanded by PPG3 / Bacon recommendations.
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Kingspan
Building System Wall
Wall thickness 194.5 mm
Floor space, throughout house:
146.30m²
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Masonry Full Fill
Cavity Wall
Wall thickness 405 mm
Floor space, throughout house:
132.15m²
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Timber Frame Wall
Frame Wall
Wall thickness 448 mm
Floor space, throughout house:
129.35m²
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With the Kingspan
Building System in the example shown below you achieve 14.15m²
more useable floor space in comparison with a house built with masonry
full fill cavity walls and achieve 16.95m² more useable floor
space in comparison with a house built with timber frame walls of
the same external dimensions and U-value (0.18 W/m²K)
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