Gap between (external) uPVC sill and Frame

MikeSpike · 2026-04-13T16:16:25+0100

Had this extension built and bay window (fitted by the builders) several years ago. There has always been a draft on the inside of this room - and randomly today whilst doing the drive cleaning noticed a large gap between the sill and window frame. Is this normal? Should it be sealed with silicone? Have done some online research can't work out if it is for drainage or should be sealed?

Thanks

foxhole · 2026-04-13T18:13:05+0100

It allows weep holes to drain and is not a cause of draughts.

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Gap between (external) uPVC sill and Frame

MikeSpike

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foxhole

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