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It’s the underside of a deck on a boat that need the boards replacing (along with a lot of other jobs)…In theory they shouldn’t get wet but in reality the edges will occasionally as the drainage channels are sh*t
Area under the deck joins to the cabin so insulation is to stop heat escaping + try to keep engine and batts above 0 degrees
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lmamammal
NotThamesWater
What is it insulating and where? I’d ask serious questions about its ability to insulate if it gets wet.
You can get 40mm PIR boards from Celotex etc. Remember to never give money to Kingspan because of its role in Grenfell.