Hot answers tagged underlayment
The first issue you need to address is why is the base eroding in the same place time after time? The large majority of above ground pools survive many years with a leveled sand base. The probable reasons for your erosion problem is an unstable base, misguided water runoff or the base is a bit too high in relationship to the surrounding area allowing runoff ...
A flexible underlay will compact when walked on. This helps if your floor is slightly imperfect (it is) and people walk on the tongue-and-groove connections (they will). The extra stress could cause the connector to snap off one of the boards. A more compelling reason is that any slight dips in the floor will cause an audible sound every time you step on it ...
They make pads and I have seen people use XPS foam sheets that you can get from the big box. I helped put Happy Bottom in a pool a few years ago, and it was pretty nice. No issues since either. I know nothing about the product but it took about 2 hours for the 3 of us to get it into a rather large above ground pool. I am sure Happy Bottom has lots of ...
You can staple it down - not as messy and fairly quick. I've used something like this on a remodel. It was 3/8" cork over plywood subfloor, then bamboo on top.
You don't have to glue it but it needs to be secured somehow - duct tape. Don't want the pieces rolling up on each other over time. You would just be duct taping the underlayment to the outside flooring or in the inside seams. And duct tape isn't hillbillying your floor. It is used because how well it handles moisture. Maybe someone has a specific ...
I would probably attempt to just patch the one area and srape the rest off. Touch up with a grinder. However, that depends on how intact the existing CBU remains after scraping off the tiles and thinset. I would take the path of least resistance. If you try one way and it is taking way longer than the other way, switch.
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