Air Tightness at Window Reveal

[benben5555]

Any tips on what to do at the window reveal for air tightness? I'll post a picture below, but we have a timber cladding trim in the opening that the window will sit within. Window will be packed, air tight foam and then mastic seal on the outside.

 

I was planning on using an air tight tape between the window and timber frame following installation. Anything else need doing? Does a membrane / vertical DPC need running round the reveal before window installation.

 

Thanks

 

 

[benben5555]

Photo

[benben5555]

Just bumping this if anyone has any experience or advice

[Dave Jones]

you need to seal it to whatever your inside structural finish is going to be.  Sit the frame back so its in line with your insulation and tape it to the timber frame on the inside all the way round. 

[Kelvin]

I lapped the external wall membrane back into the reveals and placed DPC on the bottom then the window was mounted, foamed to fill gaps and then silicone to seal around it inside and out. I used Siga Wigluv tape to seal the window to the timber kit. The joiner then built the reveals as part of the cladding install and I’ll seal these eventually too. On the inside you lap your airtight membrane around the reveals and then tape to the internal frame. I used pro clima profil tape. Practice how to make corners for a neat finish.