Finishing square windows into arched openings

[Wibbles]

Looking at putting some uPVC windows into an older property with brick arched openings. Part of the property has already been done and it looks like it's a square casement with a arched finisher at the top.

The question is, what is in the void behind the finisher?

Thanks.

 

[crank39]

How deep is the arch, is it a shallow arch or semi-circular?

 

[Wibbles]

Shallow angle of an arch exactly like the pic on Everest's web site here:

http://www.everest.co.uk/double-glazing-windows/cottage/

 

[crank39]

Probably be left hollow in all honesty, ideally could do with being foamed but i don't know of any fitters that go to the trouble

 

[Wibbles]

Okay, thanks - is that bit in the arch of the window just a bit of uPVC finisher? I suppose a piece of foil back insulation with some expanding foam to fill the gaps would be a better solution in the void?

 

[Pinnacle69]

sometimes you will find some timber behind but mostly it is a void i always fill with foam trim off when dry and then a bit of 90mm archi cut to shape to form the arch

 

[crank39]

Yeah it'll just be a foam filled as opposed to hollow flat board/soffit/utility board siliconed in place available from a 'buildings plastic' supplier

 

[Wibbles]

Thanks. And sorry for the dumb question but what is normally used to bond the architrave that's cut to shape into place?

 

[crank39]

Superglue or silicone where it overlaps the head of the window frame then a wide bead of silcone around the arch to stop it flapping