Fitting Dormer windows

buky

Hello Folks,

no answer in diy so thought I would try yet lads.

I wonder if you can help me with a window issue.

I have four white Dormer Windows which will be fitted in a 6 inch timber frame. The external wall will have hanging roof slates on battens.. My concern is how to close/seal the reveals? Is there some kind of window trim which I can use? Or can the Windows be made with an external trim?

Any help appreciated,

Bullocks

buky wrote: »

Hello Folks,

no answer in diy so thought I would try yet lads.

I wonder if you can help me with a window issue.

I have four white Dormer Windows which will be fitted in a 6 inch timber frame. The external wall will have hanging roof slates on battens.. My concern is how to close/seal the reveals? Is there some kind of window trim which I can use? Or can the Windows be made with an external trim?

Any help appreciated,

Hard to tell from that what you are doing. Any pictures?

jimini0

Lead window sill. Folded up the back and sides.
Sides of window- Flashing tape stuck onto the breather membrane and an inch onto window.
Lead over top of window under the breather membrane with the membrane sealed over it.

Anto_Meath

As Jimini0 said you need to use a lead flashing folded around the back and sides and ensure all laps are done correctly min 150 mm.
I would also see if you can you can use and EPDM membrane stuck on to the windows and the breather membrane at the timber structure of the windows. I have also seen dormer windows clad in uPVC soffit board and that has worked well.but you need to know what you are at and get it right as water getting into a roof is bad news and often if the like of this isn't fully water tight then it will let water in when the wind is blowing in a certain direction.

johney

plenty of sealant should do it.

_Brian

Would expect the chippy on the job to know how to seal a few windows.

It would worry me for the overall integrity of the work

buky

Brian,
I don't believe I ever mentioned anything about a chippy?
If you have tips feel free to give them and no need to worry.

Bullocks, what are looking for photos of exactly? It's a straight forward window installation in a timber frame.

Anton and Jim, thanks lads, appreciate the tips. Have just seen neighbours dormer, close up, where he used upvc fascia, ripped down and allowed the lip to butt back against front wall. Makes a nice trim finish.

Thanks again to all who helped.

Buky

Who2

Make sure the window is pushed out to the front edge of the frame, ensure the stud is properly ply lined and wrapped in a breather membrane, wrapped properly and left air tight. Silicone the window on the front edge and put whatever facing you want. Slate trims can be used if your going with skates hanging or j trim if your using soffet. The main thing is make sure it’s insulated to the last. Pressed zinccladding is all the rage at the moment.

kerryjack

Thinking of doing the same I presume I need planning, any chance of a few pics and price.

Anto_Meath

kerryjack wrote: »

Thinking of doing the same I presume I need planning, any chance of a few pics and price.

.
You will need planning if the windows are to the front or side of the dwelling, if they are to the rear then you don't it would be considered exempted development but they must be below the ridge line of the main house.
But if you do convert an attic area make sure you inform your insurers, as they would be claiming you are under insured in the event of any claim.

buky

thanks who and anton

kerry, I didn't get planning as stayed within the exempted allowed development, and dormers at back. At the moment it's all covered by felt so nothing to see, but I will happily take a photo and post it when the felt comes off.
I am not a professional by any means so I wouldn't necessarily copy what I have done. I ended up having to do the whole house as a lot of water had gotten in. Did it in an alternative style and I am happy with it.