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Help! Internal window reveals

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3 Apr 2025
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Hi

I've stripped this window to bare bricks because of mould and damp patches. Can someone advise me how I should fill the 10mm of plaster/render I removed. Image 3 and 4 shows the plaster partially left on one side. Is that lime plaster? (The house is around 1930's with solid walls and render directly onto brick).
The other issue is the bricks on top of the window don't seem to have any support. Though in Image 5 some of the 'white plaster' is still left on. Could that have been what was holding the bricks up?
After I apply whatever is needed on the bare bricks, I plan to fit thin 6mm insulated board around window reveal and then plaster over it.
Any advice would be greatly appreciated.
 

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OP,
Before the Pvc window was installed there was a sturdy wood frame window holding up the brickwork above.
The Pvc frame is set too far forward to support the bricks above.
Window & door frames require setting back a min of 75mm or more.

Given that damp penetration appears to be a problem then best use a 3:1 sand and NH lime render mix to
"re-plaster" the reveals & wall. Use plastic angle beads for the corners.
 
OP,
Before the Pvc window was installed there was a sturdy wood frame window holding up the brickwork above.
The Pvc frame is set too far forward to support the bricks above.
Window & door frames require setting back a min of 75mm or more.

Given that damp penetration appears to be a problem then best use a 3:1 sand and NH lime render mix to
"re-plaster" the reveals & wall. Use plastic angle beads for the corners.
Thanks for the info. Do you think it would be OK to plaster onto the bricks above or should I be looking at getting a lintel put in?
 
OP,
As my above post, the frame requires to be set back - the present "bricks above" are helping support whats above the opening.
The bricks on edge jammed in under tension are acting as a flat arch, no signs of movement, also there's a heavy section wall plate taking the weight & thrust of the rafters.
So you can render whatever you want.

Not necessary but to be 100% sure then install a lintel & move the frame back.
 
Last edited:
Poster #3,
It might appear strange to someone who did not understand the correct way of doing these things.
By the way, where did I mention anything being a "solution" for "mould"?
 
OP,
As my above post, the frame requires to be set back - the present "bricks above" are helping support whats above the opening.
The bricks on edge jammed in under tension are acting as a flat arch, no signs of movement, also there's a heavy section wall plate taking the weight & thrust of the rafters.
So you can render whatever you want.

Not necessary but to be 100% sure then install

OP,
As my above post, the frame requires to be set back - the present "bricks above" are helping support whats above the opening.
The bricks on edge jammed in under tension are acting as a flat arch, no signs of movement, also there's a heavy section wall plate taking the weight & thrust of the rafters.
So you can render whatever you want.

Not necessary but to be 100% sure then install a lintel & move the frame back.
Really appreciate it. Thank you.
 

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