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Caulking Windows

Best materials for sealing panes


I have a mountain home at a 4,200-foot elevation. On the house's southern
exposure, there are two bay windows approximately 35 feet tall with
individual glass panes approximately 2x8 feet. Do you have any suggestions
regarding the right caulking material?

— Willis, Highlands, NC


Tom Silva replies: A silicone glazing compound is best for glass-to-glass
application. If there are wood sashes or muntins, the silicone won't
stick if any moisture enters the wood. The silicone seal will break and
you'll have to remove and replace the broken silicone. You can't simply
caulk over it. If the wood frame is metal, silicone will work fine. But
remember: you can't paint over silicone, so you should buy it in the
color that you like.


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