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Old 05-01-2009, 03:22 PM   #1
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Gaps i between wall and roof

Can anyone tell me the best way to plug the gaps between the top of a breeze block wall and a sloping roof?
It's impossible to fill them with concrete as the blocks are hollow so the concrete would just fall into the gap...
I'm sure there must be an easy solution, but I can't think of it...
Just in case this makes no sense I have done a silly drawing to explain my problem...
Any help most welcome!!
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Old 05-01-2009, 04:00 PM   #2
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I would cut block and set it in the opening. The smaller top gap would be covered with a fascia board.


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Old 05-01-2009, 07:31 PM   #3
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Small sheets of tin, carried by your block supply company in boxes of 200, are designed to be placed between the next to the last row of blocks and the final row. They stop concrete from flowing down the cavity. In fact, they are called "Cavity Caps".

But if it is not possible to make these work because they are awfully lightweight, and can "float" up from the force of poured concrete if not locked between block rows (courses)..... (the block supplier will give you a handful to try for free), then just wad up stiff paper (we use concrete bags), and stuff them a few inches (tightly) down into each cavity. The concrete won't flow past.
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Old 05-15-2009, 04:23 AM   #4
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Indeed, a random mix of cement bags, small rocks and cement did the job perfectly!
Many thanks.
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