Cavity Above UPVC Door Frame

25 Dec 2014
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United Kingdom

The interior trim on my UPVC door was very loose and drafty, having been stuck to the wallpaper which has since been stripped from the rest of the hallway (I'm new to the property so can accept no credit for this).

Removing this revealed a 15mm gap above the door frame which has not been filled, along with side cavities which have been mostly filled with foam. The top gap is drafty but completely dry internally, even in the recent stormy weather.

I've read that there needs to be a small gap under the exterior top trim for drainage (The outside of this same cavity), so my question is should I leave the top cavity and just cover the internal with trim, or should I fill with some form of insulation?


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It looks like there is a damp course above the door there.

Make sure that is tipping towards the outside, then foam up the gap. Cover the top of the door with masking tape before foaming, as when it overspills it can cause staining, and be a pain to get off.

Then fit a trim to cover.

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