Sealing frame to wall - What to use (and how to use it)?

8 Sep 2010
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South West Wales
United Kingdom
Hi all

We recently had a new back door fitted and need to fill/seal the gap INDOORS where the frame meets the wall.

Down the left hand side the gap ranges from around 10mm to 15mm. It's a much smaller gap along the top and right hand side.

It's also quite deep. At some points it's around 15mm, but at other points there doesn't seem to be a "back".... If I push my 15cm steel ruler in it just keeps on going. Do I need to use some kind of backer?

There is also the plastic in the gap as can be seen in the photos. Is this some kind of damp proofing??? Will it cause any problem for what ever I use to fill the gaps?

The top and opposite side have much smaller gaps so don't know if I need to use the same or something different in those spots?

Any advice and help would be most gratefully received.

Cheers all


(PS - wasn't sure which forum to post this one in.... Please move if there is a more appropriate one. Thanks.)

Left Side 01.JPG Left Side 02.JPG Left Side 03.JPG Left Side 04.JPG Right Side.JPG Top.JPG
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Probably the easiest way for you here Max is to get in there with some ready mixed patching plaster.....push it well in, and finish with a wet brush.
John :)
Many thanks for the replies.

@Burnerman... Do you have a link to the kind of thing you mean please? Would you do it in stages or all in one go? And finally, how exactly do you mean when you say finish with a wet brush?

@foxhole... Thanks for the link. But how would you suggest I use this? What would I stick with it?

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It,s expanding foam adhesive , fills and glue any loose material , won't be dislodged by banging door unlike just filling with plaster or filler and will fill all voids .
Aha - I get you now... Sound like a good idea.

So, would it be a case of using this foam adhesive in step one, and then using something else to finish in step two? If so, would you recommend finishing with ready mixed patching plaster as Burnerman suggests? Or caulk? I don't want to use any trim...

Also, is there a chance it might bend the wood of the frame (I seem to remember reading all kinds of warnings and horror stories about expanding foam when I read about it in the past).

Both have their good points, Max.....plaster is more brittle, foam doesn't paint well. Any excess foam should just expand out of the joint without trouble, then you could cut it back when cured, maybe to plaster on top.
I don't have any problems with plaster falling out, personally and if you're not too good at getting a good finish straight from a blade, a wet paintbrush does it for you.
John :)
Many thanks for the help and recommendations. A few outdoor jobs have taken priority over this, but it is on the to do list and I'll come back to the thread and helpful answers when the time arrives.

But just to check... Is there are any chance I might bend and buckle things that should not be bent or buckled if I used the expanding foam? I think when I read about it before it was for sealing the sides of window frames. And there were horror stories of window frames bending under the stress of the foam....

Thanks again

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