Top window reveal cracking

Kmurphy · 14 Nov 2020

I’ve recently stripped back my small bedroom and removed a curtain rails to find the plaster underneath totally cracking and hanging off the reveal.

My plan was to hack it all off, build up a scratch coat, bead it and skim. Does anyone think something more is required?

The other rooms I’ve done up have not had such severe damage

dontbelieveawordofit · 15 Nov 2020

your version sounds good, or you could chop it all off and bond a plasterboard strip to it and bead and skim.

tel765 · 15 Nov 2020

The thing is its best to find the cause of the damage?
You mention minor damage to other window heads - is your house an old house with wood lintels?
From outside can you see any damage or movement signs to brickwork or render?

Kmurphy · 15 Nov 2020

It looks like someone plastered about 2cm using skim and then the rail was secured into it with those humongous nails you get in old skirting boards. When I pulled them out half the wall came with them and it just cracked along the bonding Join between The undercoat and the massive piece of Skim.

tel765 · 15 Nov 2020

So there is a 20mm deep coating of skim finish plaster - skimmed over what?

There's obviously been previous work - why, due to what cause?
Maybe when new frames were installed?

Cut nails.

Kmurphy · 15 Nov 2020

Skimmed over some mesh. Yes I assume it was done when the frames were done.

tel765 · 15 Nov 2020

What kind of lintel is there?

skhudy · 25 Nov 2020

Probably too late but just my own vaguely similar experience - Cracking around a window, took plaster back to brick to reveal a rotten timber lintel. rotted because some of the pointing was cracked outside, so water over the years got to the timber. Ended up taking out the timber and putting in a Concrete Lintel

JohnD · 25 Nov 2020

I was thinking that an original, sturdy wooden window frame might have been taken out and replaced with a weedy modern or plastic replacement, loosely fitted, enabling the brickwork to sag.

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Top window reveal cracking

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