Window trays in timber frame

Nessajane

Hello. We are building a timbe frame house. The back part has an area that is going to be clad on the timber frame while the rest will be block built. Just wondering if anybody knows anything about window trays within this cladded area? We have been told we need to get lead window trays which will come out and then lap over the cladding but not sure on this as cladding states that you have to leave a 10mm gap at the bottom/ top of windows doors etc to allow the air to flow through so this won’t work will it. Any help would be appreciated! ( the cladding will be fixed on batons coming out 150mm as the bottom half of the wall is block built!)

Calahonda52

Who is doing the telling here?

have you a link to the cladding?

Have they worked details of how it all is supposed to be rain tight?

Dudda

Pressed aluminium cills are what's mostly used when you've a timber frame or external insulation. You can get them the same RAL colour as the windows. Don't know why anyone would suggest lead unless it's a particularly style or look they're after.

If you look at the website passivehouseplus.ie (no affiliation with) a lot of new builds post details of the construction. I'm not saying they're perfect but a good place to get ideas / inspiration as they're usually of a decent standard.

eg this house has block structure but has block outer and timber cladding. https://passivehouseplus.ie/magazine/new-build/essex-village-becomes-eco-pioneer-with-latest-passive-house-scheme
has this detail which I think is pretty good and shows how you can have a 15mm ventilation gap under the cill https://passivehouseplus.ie/images/Essex%20village/Typical-joinery-details.jpg

I think if you're looking to build a house it's important it's built right as you'll want it to last you a long time and not have issues so you could sign up for a one month trial membership you'll see more drawings of other houses (again I've no affiliation with the site).

Tip: Squirt foam on the back of the aluminium cills to deaden the noise when the rain hits them particularly on exposed elevations.

BryanF

Recommend aluminum cills. they need to be folded at back and sides and angled outwards with drip, then powdercoated

ALL your construction details should be prepared prior to commement on site.