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Windows & Door fitting

Thickness of silcone sealant under between plastic external window sill and original window sill.

Anonymous user 03/03/2024 - 3.06 PM

We have just had new windows fitted. They have fitted a lipped window sill externally (previously it was flat) over a brick window sill. This gap has now been filled with over 2 inch thick silicone sealant - they say to prevent water ingress. Is this the norm or just used to cover up holes not filled prior to fitting the sill and because difficult to fill as a small gap

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3 Answers

iGlaze

Rating: 5 out of 5

Biggleswade

Hi, Personally I wouldn't seal any gap with silicone bigger than 7-10 mm. The gap under the window should have been pointed with sand and cement. First I would question why there is a 2 inch gap to fill. Was the window measured correctly? Hope this helps. Grant iGlaze.

Answered15 June 2014

DNA Consillium

Rating: 5 out of 5

Herne Bay

I'm assuming the reason for the 20mm gap is because the "brick sill" is slanted? If this is the case, then a neat strip of facia trim could cover the unsightly "mastic" and finish the job correctly. And I agree with Grant, anything over 10mm should be questioned. I hope this helps Cordially David

Answered27 May 2020

Anonymous user

Sounds like window wrong height and been packed up

Answered23 June 2021