Sash window stud wall

[Seanie_230]

Hello all

Can someone help me get my head around this.
We have a external wall that needs its window replaced.
The current wall is in the outbuilding and this will become part of the kitchen.

Building regs say that it needs to be stud walled and insulated to 100mm.

My question is a want to put in a timber sash window that looks out onto the garden and to keep it looking right.

My question is should I have the window make to include the 112mm inside bit so the new wall is flush and the architrave can go on or should I get the sash built in normally on the internal brick and then once the stud wall is installed I can then pack out the window with timber so it's flush with the plasterboard.

What is the best way to go about this.

My second question is how much is a timber sash window that is made to look something like the originals, I could get one on eBay that will look great too that is double glazed and maybe cheaper.

Cheers all if needed I can post a picture

 

[plasticpigeon]

I think it is all a matter of taste. It depends what age your house is too. I would try and match the correct appearance from the outside. Most sash windows are set back from the face of the outside brickwork by around 4.5" or a half brick. Then you would probably end up with about 100mm or a bit more between the inside of the studwork wall and the inside face of the window frame. You could just create a wooden lining or if you feel like being fancy make shutters or even splayed linings. Here are some examples I found on google images.

http://www.sashesandshutters.co.uk/shutters.html

 

[Seanie_230]

Hi there
Yeah mine will be set back also.
I did not think about adding a wooden lining, that makes sense and means I can install the window before the studwork goes in.
I think some excellent lining to bring the window in line with the internal plasterboard with architrave around will look excellent.
Thank you so much.

 

[dalivar]

We're getting quotes for timber sashes at the moment, range from 900 to 1100 pounds each so far with fitting.

 

[AMc]

Try and match the depth the window is set back with the existing windows in the house.
Use a wooden liner to cover the distance between the inner face of the window and the new wall surface then architrave to cover the liner to wall gap.
From the outside it will look right and from the inside the extra window board (a.k.a cill) is handy.
Make sure you seal the gaps around the liner to prevent draughts whistling around the edges and making a mockery of your new insulated wall.
100mm sounds like quite a lot of wall insulation - is that celotex/kingspan/ecotherm solid board or rockwool?