Morrisman
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- 7,174
- Location
- Staffordshire, England
Depending on the width between joints you might find this sort of stuff shoves in and holds itself up, then you can fasten a sheet of plywood up to seal it in forever. It comes in slabs about 4" thick, and fairly stiff, yet flexible. I did my wood workshop in it, walls and roof.
I bought it in Wickes.
I bought it in Wickes.