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PostPosted: Fri Nov 02, 2018 11:01 am 
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Hi, After fitting a standard UPVC Casement Window I have noticed after a few weeks that there is a slight bit of damp on the inside plastered walls of the inside window reveal where the plaster edge touches the UPVC frame. This was more prevalent after driving rain. It seems to appear more at the bottom (near the wooden interior window sill) than anywhere else but does slightly appear a little bit further up the window frame. The frame sealant on the outside wall looks pretty good however there is a slight sealant hairline gap at the top middle about 30mm long which may be allowing water ingress but other than that I cannot see anything major. The frame was installed dry onto the UPVC Sill without any silicone seal and after the matter I am now aware that it is good practice to seal the back lip of the upvc Sill to the upvc frame and also seal the sides of the upvc Sill to the upvc frame to stop any driving rain from outside going under the frame and finding its way to the sides of the sill and into the brickwork ect.
I intend to seal the 30mm long airline crack however my question is how lightly is it that my failure to seal the frame to the sill is causing the plaster to go damp. At worst I can remove the window and do the above or (from the inside) chisel out brick close to the sill edges and apply silicone to the sill all the way around. I’d really benefit from advice so that I can make the best informed course of action. Thanks to all.

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