Bought a floor membrane for the cellar with corner and sealing tape. Quality is very good, the membrane is tough enough to work into the area and flexible enough to not break or split. The tapes are incredibly adhesive and work to seal overlaps and edges exceptionally well but be careful not to let the tape touch itself, or you'll be throwing it away. My only issue was the cost, notably on the tape. At £54 delivered, it's very expensive, especially as I only needed a small amount to finish the job but had to buy a standard, long roll again. Likewise the membrane only came in set size, which is far bigger than our floor but no option to reduce. All in though, great materials, tough, sturdy and will definitely prevent water and moisture ingress from coming up though flooring.