How much silicon should be used around the edge of a new upvc window?

Question

I hired a window fitter to replace my living room window. He's replaced the window but when he was installing it I felt like he used a lot of white silicon before he covered it with a cover. How much sealant would be too much? Also he used white sealant with a brown frame? Am i wrong in thinking he could have colour matched? Thanks.

Gary · Accepted Answer

Silicone should always be colour matched. Silicone should be used sparingly and only a small neat bead should be run where necessary and seen. If he covered the silicone with a cover strip and it cannot be seen that is no problem.

Gary · Answer

Sounds like it was mis-measured. Only occasionally would you need to use a lot of silicone or expanding foam when the opening isn't square.

Steven · Answer

It seems to me that maybe the window had been measured too small, the gaps around frame and stonework usually are filled using expanding foam and if there is scribing pieces ( covers ) these would be then fitted to cover the filled gaps. The silicone should have been colour matched or at very worst case a clear silicone should have been used to further seal the window. Hope this helps.

Barry · Answer

He should have used about a tube if the window was the correct size when fitting. If used more the window must have been the wrong size so in that case you should use expanding foam.

Christian · Answer

Just a nice thin bead to seal the window, should be nice and tidy.

Andrew · Answer

Yes he should colour match. Company's do use brown on a white by using masking tape round the edges. For a 1200x1200 just 1 tube should cover this.

Wayne · Answer

It seems that at the survey this was mis measured and left you with a shorter window.
Normally there will be a trim added to hide this or a knock on section to make it up .
The gap should be no more than 12mm.

Eddie · Answer

If the new window frame had gaps around after installation the correct method would have been to foam fill all round to keep the best insulation property. Then a small D mould/trim and then a nice tidy silicone joint between the uPVC trim and the wall.
We normally use no more than 1 tube of sealant per window, size depending.
Yes a brown sealant should have been used around the window.

Regards Eddie Wood.

Anthony · Answer

The outside should off had foam in the gaps and then sealed up.

Mark · Answer

It doesn't sound like your window fitter did the best job from what you have said. But normally Once the window is screwed level into place you would foam all voids around the window to insulate, Then silicone and trim the window with matching materials to stop water ingress. If you have any other questions please look me up.
Mark
MB Frames

Stuart · Answer

There isn't really such thing as to much silicon but as it's used to weather seal the window and trim. Personally I use clear silicon as it looks the neatest. Brown can be used but is more expensive and looks messy.

James · Answer

Can you see the white silicone? Its a process called back filling its the right thing to do if you're using internal trims. Personally i would re plaster or fill the gap.

How much silicon should be used around the edge of a new upvc window?

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