They’re also light weight, so less lifting equipment is required. Reduced labour time on site as panels are cut to the exact size in the factory.Polyurethane foam based insulation material also offers lower u-values (lower is better) and a thinner wall profile, although they're more expensive than the expanded polystyrene type. 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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