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Home / Technical / U-Values & Airtightness

U-Values & Airtightness

SIP Energy U-Values

U-values are one component in your building Energy Rating (BER). Final u-values on SIP Energy buildings depend on a combination of panel thickness and type of internal lining (plasterboard) chosen. Coupled with your floor insulation and window/door choices, SIP construction is the easiest way to achieve high BER scores.

A summary of panel values are shown as follows:

Internal Lining / Panel Thickness 130mm 155mm 180mm
Standard 12.5mm Plaster Board 0.26 0.23 0.16
37mm Insulated Plaster Board 0.21 0.18 0.15
50mm Insulated Plaster Board 0.18 0.16 0.14
62mm Insulated Plaster Board 0.16 0.14 0.13


Remember: it is possible to achieve very high energy ratings (A, B), even with modest panel u-values, due to the inherent airtightness.

SIP Energy & Airtightness Performance – the Industry leader

Airtightness of a building has been estimated to account for between 20% – 30% of your building’s energy requirement.

By virtue of building with SIP Energy panels, you are already on the path to not only exceed Airtightness requirements, as laid down in Building Regulations, but also to exceed Passive standards.

In two recent tests (Nov 2010), customer home’s achieved – without membranes – of 0.57m3/hr/m2 and 0.84m3/hr/m2. This gives you the perfect basis for an easily achieved airtight build, with no additional costs or measures, to ensure.

In another airtightness test, conducted at first fix level, without membranes, without any plasterboard on the walls, or ceilings, and with no floor coverings, we still achieved of 0.9m3/hr/m2! This level of quality & performance is unmatched by any other structural system.

And, as SIP Energy manufacture large-format panels, up to 3m x 15m in one piece, SIP homes have only a fraction of the joints and connections than are in any other method of build.

So your savings are two-fold: increased thermal efficiency, and significantly reduced building costs from reduced time-on-site.