On Thu, 03 May 2007 13:22:05 +0100, "Dave Plowman (News)"
wrote:

In article ,
Stuart Noble wrote:
Pack between the frame and window with small wedges at your fixing
points so you have an at least 5mm gap all round and don't tighten the
screws so as to distort the window. Then fill the gap with silicone
sealer.

Or use expanding foam, which holds the window securely once it's set.
You can then do the fixings without fear of the frame moving about

Absolutely - had a brain fart there.

No problem, I kind of assumed ( given the thickness of the window
frame ) that a combination of squirty foam and sealant would be in
order.
All I have to do is find some low expansion stuff...it doesn't seem to
be as common as the 'big gaps' foam.

One more related query - is it necessary to build an enclosing frame
for the window, or is it sufficient to fit the thing flush with the
building frame ( I'll bead the exterior to give the lapped panels
something to butt up against )?

Cheers,



--
Stephen Howard - Woodwind repairs & period restorations
www.shwoodwind.co.uk
Emails to: showard{whoisat}shwoodwind{dot}co{dot}uk