Andrew

Cladding Window Detail

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Just trying to get my head around the detailing around the windows for our build. We have timber frame with horizontal Siberian Larch cladding counter battened onto the frame. 

 

This is a picture from the internet and looks like a fairly typical detail with wooden reveals around top and sides with a cill at the bottom.

 

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But I'm trying to understand what happens at the top with regards to managing moisture. Our windows will be set back into the timber frame, so there will be a fairly deep reveal across the cavity and into the top of the window. I have seen some details with a metal flashing on the top of this top wooden reveal but there are plenty of pictures like the one above without. Also is anything special needed with regards to draining the cavity above the window. Unless I'm missing something there seems a high likelihood of water pooling above the window in the cavity on top of the reveal?

 

Has anyone done this or know how this is normally done?

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12 minutes ago, Andrew said:

Just trying to get my head around the detailing around the windows for our build. We have timber frame with horizontal Siberian Larch cladding counter battened onto the frame. 

 

This is a picture from the internet and looks like a fairly typical detail with wooden reveals around top and sides with a cill at the bottom.

 

products-Siberian_larch_horizontal_Half_lap_profile__74785.1562700903_1280_1280-e1588206841346.thumb.jpg.999ad5954da40d2bf7d1691dd5d014a7.jpg

 

But I'm trying to understand what happens at the top with regards to managing moisture. Our windows will be set back into the timber frame, so there will be a fairly deep reveal across the cavity and into the top of the window. I have seen some details with a metal flashing on the top of this top wooden reveal but there are plenty of pictures like the one above without. Also is anything special needed with regards to draining the cavity above the window. Unless I'm missing something there seems a high likelihood of water pooling above the window in the cavity on top of the reveal?

 

Has anyone done this or know how this is normally done?

This is one I did a few weeks ago 

It was onto block work Batons then membrane Batons on the reveals and head Cladded with Cedar then we used a 50 mil 5 mil thick Cedar angle mitred to dress all the opening 

Sorry no close up 

I can take one on Monday if needed 

 

C60A36D6-36FF-4254-A1D1-17008687604D.jpeg

5D9AF9E1-DE29-45DF-93C4-E3C0B185E21B.jpeg

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9 hours ago, nod said:

...

It was onto block work Batons then membrane Batons on the reveals and head Cladded with Cedar then we used a 50 mil 5 mil thick Cedar angle mitred to dress all the opening 

Sorry no close up 

I can take one on Monday if needed 

 

Gary, I'd be so glad if you would please. I'm working on the same issue....

Thanks

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15 minutes ago, AnonymousBosch said:

 

Gary, I'd be so glad if you would please. I'm working on the same issue....

Thanks

No probs Ian

 

as I stated in a previous post 

Timber cladding isn’t our bag 

But with the materials onsite and cladders on Furlough 
We gave up four days to help out 

I need to call on there so I’ll snap a couple of photos

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11 hours ago, Andrew said:

This is a picture from the internet and looks like a fairly typical detail with wooden reveals around top and sides with a cill at the bottom.

I'm not sure that the picture is correct in showing how it should be done. It's important that water doesn't collect on the top reveal. On my house I had the top part of the reveal inset from the side pieces so the cladding goes over the top of the front edge of the top reveal with a 3mm weep gap between the cladding and top reveal.

 

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6 hours ago, nod said:

I need to call on there so I’ll snap a couple of photos


I’d be really grateful for this too, thanks.

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4 hours ago, PeterStarck said:

On my house I had the top part of the reveal inset from the side pieces so the cladding goes over the top of the front edge of the top reveal with a 3mm weep gap between the cladding and top reveal.


Thanks, that detail make a lot of sense.
 

You do see quite a few pictures with all the reveals protruding out from the cladding slightly which looks good but I don’t know how they prevent water build up on top of the top reveal.

 

Do you have a more straight on photo of the window?

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I will add to the mix, though we have vertical board on board cladding. I ripped a bit of larch approximately 50mm wide and fixed that over the top of the aluminium window frame. The top edge of this ripped bit of larch is bevelled at about 15 degrees to allow any water behind the cladding out.

 

The cladding then comes down so the bottom bevelled edge of the vertical cladding is in line with the bevelled edge of the piece ripped for the reveal. There is about a 4mm gap then for water to drain out the cavity, with any water running down the vertical larch dropping off on to the aluminium cill of the window.

20200531_135912.thumb.jpg.aa1eae58f4f7c07b8465803f69c3e33d.jpg

20200531_135922.thumb.jpg.fe90397a671cbf9f0cc2fc7c44fb8ab9.jpg

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2 hours ago, Andrew said:

Do you have a more straight on photo of the window?

Don't know if these help.

 

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5 hours ago, jamieled said:

I will add to the mix, though we have vertical board on board cladding. I ripped a bit of larch approximately 50mm wide and fixed that over the top of the aluminium window frame. The top edge of this ripped bit of larch is bevelled at about 15 degrees to allow any water behind the cladding out.

 

The cladding then comes down so the bottom bevelled edge of the vertical cladding is in line with the bevelled edge of the piece ripped for the reveal. There is about a 4mm gap then for water to drain out the cavity, with any water running down the vertical larch dropping off on to the aluminium cill of the window.

 

That's really helpful, thanks for posting. 

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3 hours ago, PeterStarck said:

Don't know if these help.

 

Thanks, that looks spot on. I'd be really happy if ours ends up looking as sharp. 

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When I was recently doing some repairs to my cabin windows I realised that water was blowing into the structure between the cladding and the window linings and has caused rot to the fairly cheep marine ply linings (it’s only a cabin...) to solve this I replaced the linings with yet more cheep ply 😂 (as i had it on stock) but added A  rubber  seal between The cladding ends  and the linings. It’s worked really well and I can at least rest assured that water won’t be getting behind there anymore. The top of the window is ply lined that comes down at an angle So any water will always want to come out, I upgraded this by cutting up some old velux flashings (I have many....) And put them on top with a lip to keep the ply nice and dry. Other photos are of the back of the cabin with the cladding overshooting to protect the linings, The linings are all angled down so that any water that blows in it will always fall towards the cladding rather than the window. The cladding is all cut at 45 degrees to help shed water rather than it sitting on the bottom edge of the boards.  

C62BAA0B-4DAC-4FDE-AAE2-517BCDB25ED3.jpeg

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5DFB396B-07C4-47D3-A013-078E84EC8F6F.jpeg

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