Frame

A:  A 3 sided construction that is welded at the top corners. Where the two frame jambs join the cill, most window manufacturers will apply a wet silicone seal to help prevent leaks or moisture ingress through your frames.

This can be risky as sometimes the windows are moved before the silicone sets... or even worse; it is forgotten to be applied.

You won’t know this has happened until you see damp patches on the internal walls around your window frames! This cannot happen with our windows.