nothing , it’s strong enough to support itself . from the adhesive on the internal brick.......
but you can use the paper board edge and bond it to the window frame if you fancy . show us a picture.
Hi thanks for the replies. As this is a new build and it will get inspected do I have to put in something in the reveals. The rest of my windows don’t have anything just insulation not damp proof or anything.
Also I need to build up the level from inner brick to outer brick I was just going to add 2 boards if the first board is touching the brick on the outer side and obviously sat on the inner brick will this cause water issues
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