Gareth C

Hi @Xenia How did you get on with the land negotiation? Any further with the project?

Yes, the airtightness layer is on the inside of the studs, in a typical timber frame arrangement. I am unsure of site's way of sealing but I would imagine it isn't anything special. Current detail is running DPM up back face and sealed to airtightness membrane from wall, as usual practice. Those 2 points are good references!

Why would you use a liquid DPM for a new build. Partly my question. Actually, I see many benefits if sprayed on, no need for folding membranes in corners or tricky junctions. Quicker, easier, no tearing. Maybe it should be: why would you not use a liquid DPM for a new build?

I didn't say DPM's are used for airtightness, linking the DPM to the VCL is though.

First post here, although have browsed many a forum page in the past for answers to other queries over the years! With a standard timber frame construction, utilising membranes internally and linking them with damp proof membranes is critical for the airtightness of the overall house. If using a liquid DPM instead, I am wondering if this would make it harder to effectively seal the building from an airtight point of view or not. First thoughts are no, the areas requiring sealing, such as around openings and penetrations can still be taped and sealed. Has anyone used liquid DPM in this scenario, and is this a good alternative to a membrane?