external envelope
SFS systems: improving insulation while saving space
The demand for increasing levels of thermal performance is driven by both the market and regulatory pressures and can be answered by innovations in Structural Framing Systems (SFS) technology, writes Knauf
further with advances that offer far greater levels of insulation without sacrificing usable space. ‘Through the wall’ building facade systems incorporate insulation within the frame itself and can provide a range of U-values from 0.32 to 0.15W/m2
T
he advantages of SFS methods of construction in terms of speed and efficiency on-site are well-established; but the latest contemporary systems are taking this even
K
depending on the materials and thicknesses used. In conventional systems, insulation is applied externally and
so adds to the thickness of the walls, decreasing the amount of usable space within. ‘Through the wall’ SFS avoids this problem through placing the insulation in the frame itself so that it is sandwiched between gypsum-based sheathing boards and the internal plasterboard lining. Clever thermal stud designs reduce thermal transfer through
the steel by offsetting rows of slots which effectively interrupt the conduction of heat through the metal, creating a far longer path for the heat to travel that results in far greater thermal efficiency. To allow for different thermal, acoustic and structural
requirements, the steel framework and the insulation is supplied in three different thicknesses – 100mm, 145mm and 195mm. Even greater thermal performance is possible using an additional layer of earthwool on the inside of the building. Sandwiched between two layers of liner, the interior insulation is available in 45mm, 70mm and 95mm thicknesses and can boost U-values up to 0.15 W/m2
K. Continued overleaf... respond online at
www.architectsdatafile.co.uk
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