Structural insulated panels

Structural Insulated Panels (SIPS) are an off-site, easy to build wall system commonly made up of insulation sandwiched between 15mm board. This should preferably be installed externally to minimise the thermal bridging of solid timber sole and wall plates, and to compensate for the additional timber commonly used around window and door openings. Some SIP panel systems need additional insulation to achieve the U-values necessary for Passivhaus, particularly the thermal bridging criteria.

Advantages and disadvantages of structural insulated panels


• Off-site construction provides accurate tolerances, window and door holes etc.

• Ease and speed of erection.


• Some modification may be needed to reach Passivhaus performance levels, particularly for thermal bridging.

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