The Woodland House
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Posted By: GreenPaddyGents, what information do you put forward in our details to building control, so that they accept the design of timber frame without a "traditional" vapour control layer. I really want to go down this OSB airtightness route, as "traditional" internal membranes is a pain, but I dread the response from the BSO.
Posted By: fostertomwe bubble-glue
Posted By: borpinWhat exactly is bubble-glue?
Posted By: TimberCan't see BCO having too much of an issue with it. It is still considered traditional timber frame used in a reverse wall configuration.
Posted By: Timberfrom a structural point of view you need to make sure you can prove it works. Screws don't have the same shear capacity as nails, and the glue joint is something that can't be justified if it is a site based
Posted By: TimberYes, but if you need to submit structural calculations to validate the racking resistance, you can't take contribution from a site applied adhesive (if I remember correctly). It is not a controlled process, so the only 'official' contribution to racking resistance you can take is from the screws.
Posted By: TimberOh and the glue, AFAIK is a polyurethene D4 adhesive. Google and you will find suppliers. The Americans have a product called Gorilla Glue.
Posted By: an02ewavoid getting on your hands as i have not found a solvent that will remove it as yet and it just has to be left to gradually rub off
Posted By: Cav8andrewan02ew, what would you consider sealing the outer surface with and would you have any concern that it might compromise the vapour permeability of the roof and the 5 to 1 ratio. My suggestion for the Fastight Coating was for the inner face of OSB before facing with plasterboard/Fermacell.
Posted By: an02ewIs there any reason why i cannot move the air tight layer(OSB) to mid way throught my wall make-up? as i in my wall make up, from the outside: 200mm EPS on 11mm osb(airtight layer) over 147 timber frame filled with warmcell 500 covered with Plasterboard.
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