Timber Frame Construction?

Best Practice Considerations Where Timber Frame and Floors Meet

Is the way in which timber frame construction and SIPS construction integrate at ground level flawed? Currently reliance is placed on a number of separate elements working together as one, but in practice these elements are unconnected. Should the construction approach be changed so at the same time one can address the concerns raised when appraisal of Part C of the Building Regulations was conducted?

At ground level the site operative is required to establish three protective DPC’s: The oversite membrane, the DPC in the outer skin, and the DPC in the inner skin. The combination of all three is intended to provide complete and unpunctuated protection of the building footprint. But, with three unconnected elements this everyday construction arrangement has weaknesses. A different approach can eliminate those weaknesses; damp ingress, hygroscopic absorption and the entry of contaminated land gases into the building envelope.

Tackling first the subject of contaminated land gas, the World Health Organisation (WHO) announced some time ago that radon gas (which is present to some extent in most areas of the UK) is more dangerous than first realised.  Furthermore, with more airtight build standards, opportunities for some natural radon dissipation/exit paths from structures are reduced.

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