ummm not waterproof, but water resistant EN312-5 or P5, but in a loft
P4 should be adequate and should be about a pound a sheet cheaper (£5
vs £6 per 8x2 board)


I agree I used the wrong word, it's made with waterproof glue - but water
resistant is the term I should have used... on new floors I use phenlioc
coated wheyrock, that will take a lot more water than water resistant board.

Rick