HEB1

Will be cladding with horizontal Cedral Click in a few weeks (couple of photos in my post grabbed from neighbours build with vertical Larch). Plan to run window head DPC wider than window then fit Cedral Lintel profile to firestop. 10mm vent gap before next vertical battens start. Under cill will be 10mm vent gap with insect mesh. Tricky to visualise but hopefully once all ali profiles fitted will be straightforward.

I think more to do with Firestops surrounding the window but certainly easier to clad we hope!

After horizontal rain blown at 50mph into our newly sealed windows - we've got water pouring in through every fixing strap. I had assumed the windows would be set into the reveals until local regs up here in Scotland dictated that 50mm of the frame would hang outside the cavity as we are cladding with cement board. How on earth can I insulate/waterproof around all those fixing straps - (Door fitted by well respected local window company) I have TP600 tape on the outer edge of the window to timber batten, Soudal SWS foam from the inside then Everbuild 625 Silicone around the edge but only a couple of mm gap between the window strap and the reveal. This is where water is pouring in and I seek advice on what to seal the gap with please.

Thank you - much appreciated!

Thank you for the tips, Would you not bother with compriband? (joiner said even window grade foam will distort the upvc frame which I can't believe) It will be room in roof and I will be asking for the 180 cills ordered as can then set window back a bit further Many thanks

Many thanks for that, should the window be sitting on silicone or compriband?

Having hovered over the site for the last 2 years - we now have our SIPS kit largely assembled up on the Outer Hebrides. We are aiming for high detail on airtightness and will be cladding it in 12mm thick Cedral Click on a 50mm timber batten A recurring theme I remember reading on the forum is 'windows, it's always the windows'. Following the predictable " leave it to us, don't bother with air tightness" conversation - our lovely Rehau windows are in: My concerns are, 1. 50mm of the 70mm frame is sticking out of the cavity (although from inside they look great) 2. Should the window cills be sitting directly on the VCL/Breather membrane in the cavity with nothing to prevent water/air ingress? - I had assumed at least a bed of silicone? 3. Our entrance doors are due to be similarly fitted this week. 4. Gaps of only 5mm on 3 sides of openings I had planned on using Compriband on the outer edge with low expansion foam on the inner (as specified) with the windows flush with the outer edge of the cavity, I had ordered 180mm cills specifically but 150mm cills have been supplied. Photos also attached below show standard practice up here to have the firestop flush with the outer edge and tight up against it for ease of cladding the reveals but is this good enough? Gaps are squirted full of silicone. Any help would be appreciated as glazing yet to be fitted in the large windows.

Having hovered over the site for the last 2 years - we now have our SIPS kit largely assembled up on the Outer Hebrides. We are aiming for high detail on airtightness and will be cladding it in 12mm thick Cedral Click on a 50mm timber batten A recurring theme I remember reading on the forum is 'windows, it's always the windows'. Following the predictable " leave it to us, don't bother with air tightness" conversation - our lovely Rehau windows are in: My concerns are, 1. 50mm of the 70mm frame is sticking out of the cavity (although from inside they look great) 2. Should the window cills be sitting directly on the VCL/Breather membrane in the cavity with nothing to prevent water/air ingress? - I had assumed at least a bed of silicone? 3. Our entrance doors are due to be similarly fitted this week. 4. Gaps of only 5mm on 3 sides of openings I had planned on using Compriband on the outer edge with low expansion foam on the inner (as specified) with the windows flush with the outer edge of the cavity, I had ordered 180mm cills specifically but 150mm cills have been supplied. Photos also attached below show standard practice up here to have the firestop flush with the outer edge and tight up against it for ease of cladding the reveals but is this good enough? Gaps are squirted full of silicone. Any help would be appreciated as glazing yet to be fitted in the large windows. IMG_9434.pdf IMG_9447.pdf IMG_9442.pdf IMG_9451.pdf