I wonder if it’s bleeding through from the back?
Maybe a compatible tile adhesive and primer Or just primer and levelling compound
I wouldnt. Ive never had a problem with glue sticking to plywood
They all have the same hydro seal i believe
Its impressive with a different name. They’ve rebranded it for b and q only.
Sp101 is great quality. Your looking for a class 3 plywood basically. There’s plenty other good options. Jewsons do a flooring grade plywood. You...
Sit
Fg1 is very soft. Sp101 is machined very well. If your subfloor is flat it will sot perfectly
Its only problematic when you use a poorly manufactured product or you install it over a unsuitable subfloor
Quickstep Alpha is very good for clic vinyl
Or black pad. What ever we had
We use to put a red pad on first and then the paper. Sometime bit of spray or contact tape but it usually holds it
Looking at the level it looks like one side of that hump is alot lower.
So did he see the subfloor on the survey? Did he put a level over it and discuss with you?
When the walls come out the floor is often miles out. Did the builder discuss that with you? Did the floorlayers see the subfloor after the wall...
