In message , Tim Lamb
writes
In message , PeterK
writes
In the past 3 years I've fitted pre-glazed softwood windows by Jeldwen
and another major UK manufacturer plus unglazed frames from one of them.
The guidance received for fitting the units was double sided glazing
tape (neoprene?) on the inside rebate. Plastic glazing blocks on the
bottom. Offer up the unit and ensure equal side clearances. Fit
glazing bars (brass pins) with a small bead of low modulus silicone
sealant on the glass edges. There was also an opinion offered that the
glazing bars could be fitted dry and a minute bead of sealant along
the glass/timber borders. I treated the glazing bars and rebates with
Sikkens wood stain before fitting. So far they have survived 2
winters on south & west facing windows in a very exposed situation
(horizon 100% visible and between 5 and 15++ miles away) with no signs
of any "wear". Also the bottom glazing bar is a "L" shape with plastic
spacers to hold it above the frame rebate and ensure drainage (I hope!)

This sounds exactly what should have been done. I think they need to
start again. Pulling the beads is likely to wreck them. Maybe the frame
suppliers can supply beads only.

Thanks. I'll phone around on Monday and see what can be done.

Hmm...

Local double glazed unit supplier says...

Butyl strip round inside of rebate.

Spacer blocks to support the glass

Fill voids with low modulus silicone

Second layer of butyl

Brass pin beads

trim off butyl below bead

seal with low modulus silicone.

regards

--
Tim Lamb