of the roof to be uninsulated. By comparison, in a property constructed with SIPs, as little as 4 per cent of the walls and 1 per cent of the roof may be uninsulated. These very high levels of performance mean
that the size of any heating systems can be greatly reduced, keeping both capital and run- ning costs down. By cutting energy demand with a ‘fabric first approach’ SIPs also greatly reduce dependency on expensive renewable technologies, and lend themselves easily to achieving the levels of performance needed to meet the Passivhaus standard, which requires almost zero heating.
boards and through poorly sealed loft hatches and top storey ceiling light fittings. As well as providing an effective air seal, the
jointing arrangements in SIPs mean that the insu- lation layer is typically interrupted by less repeat- ing studwork than in a timber frame, greatly reducing repeating thermal bridging. For exam- ple, in a property constructed with traditional timber frame, the repeating thermal bridges caused by timber studs in the walls and rafters in the roof, means that you could typically expect 15 per cent of the walls and 6 per cent
MVHR Because the buildings can be so airtight, good, controlled ventilation is an essential part of the design. By introducing MVHR (Mechanical Ventilation with Heat Recovery), the energy sav- ings can be further enhanced, as heat recov- ered from the old air being expelled is used to warm the incoming airflow.
Space saver Where space is at a premium, the highly effi- cient integral insulation helps to make the most of the available footprint, keeping wall construc- tions much thinner than traditional methods such as brick and block, without loss of strength or thermal performance. Using SIPs for the whole construction also generates an intrinsic warm roof space, which can easily be designed as
Building with SIPs can help to make sure that projects are kept on track and the ‘
’ is realised
an additional room, or to provide a safe, dry storage area.
Aesthetics SIPs can provide all of the structure and the per- formance that could be required for the building envelope. All that remains then is to complete with whatever finish is desired, whether that is brick, render, timber, stone, tile or metal. The design possibilities are wide and varied.
SIPs for self-build Building your own home can be an exciting prospect. Building with SIPs can help to make sure that projects are kept on track, that the fin- ished building meets the designed performance, and that the ‘dream home’ is realised, with the added bonus of minimal heating bills.
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