Filling gap above door lining on block wall

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Hi all,

I am fitting some door linings into openings that used to have external doors in them, and are about 100mm too tall.

What's the best way to fill the gaps, and avoid cracking? I was thinking of fixing a piece of timber in to the lintel (Avoiding the lining), and plaster boarding or cement boarding it, and having the plasterers go over it?

Any advice welcome.
 
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OP,
External doors are typically fitted in frames - internal doors are usually fitted in linings.
Have you taken it into account that frames are wider than linings?
Why not post a pic?
 
A big piece of timber may expand/contract. I would put a frame in the gap and plasterboard it before plastering.
 
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I would put a frame in the gap and plasterboard it before plastering.
That's what the OP said he was going to do.

I was thinking of fixing a piece of timber in to the lintel (Avoiding the lining), and plaster boarding or cement boarding it, and having the plasterers go over it?
Sounds ok. Even better if you had loads of tolerance and could lip the (9.5mm?) plasterboard onto the masonry rather than but up to it.
 
Sounds ok. Even better if you had loads of tolerance and could lip the (9.5mm?) plasterboard onto the masonry rather than but up to it.

I do have loads, the wall is going to need a coat of hardwall, so lipping some 9.5mm plasterboard onto the wall all around, with some Sticks Like behind, would be easy.

Thanks for that…. I’d not even considered it and it should be great for preventing cracking!
 
Sounds ok. Even better if you had loads of tolerance and could lip the (9.5mm?) plasterboard onto the masonry rather than but up to it.

I did this today. 4 plasterboard screws from the board into the timber, and a generous helping of Sticks Like where it was covering the pebbledashed masonary. Seems nice and solid, so hopefully it doesn't crack :)
 

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