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Does the SIP building system need a vapour barrier?

April 26, 2017barrier building SIP system Vapour

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Does the SIP building system need a vapour barrier?

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Calculations in accordance with BS 5250: 1989 (Control of Condensation in Buildings) shows no requirement for a vapour control layer with the Structural Insulated Panels, however buildings have a tendency to alter their psychrometric conditions (% Relative Humidity) through change of use and therefore, it is always good practice to install a vapour control layer (VCL). This can be installed in the conventional manner, with polythene, or by using foil backed plasterboard.