SIP panel home kits can, just like any other construction type out there, be designed to suit whatever performance standards you require, by simply changing the type or thickness of the insulation built into them.ĮPS (expanded polystyrene) insulation is available within SIPs but it's inferior to the polyurethane fitted by the majority of SIP manufacturers in the UK, and not just in terms of u-value.ĮPS is more difficult to bond to the OSB board in a way that offers the sort of strength provided by the polyurethane boards as they chemically bond to the OSB as the polyurethane is sprayed rather than relying on a separate glue product. So the SIPs should offer a faster construction time. Then once erected timber frames need to be allowed to dry fully before adding insulation and a vapour barrier etc. Whereas timber frames typically arrive on site with just the breathable membrane attached to the outer edge and no insulation or inner wall finish applied. The big advantages SIPs have over timber frame is they're easy to make air tight and they arrive on site insulated and ready to install.
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