I am removing old linoleum and will use thinset to adhere Hardibacker
to the plywood floor. How uptight do I need to be about scraping up all
the gray papery stuff that is stuck to the floor? See the following
image to see what I am finding stuck to the plywood:
If you are going to apply hardibacker, you could have left the vinyl
You can moisten the paper backing and scrape it off more easily, let
the floor dry out, then stick the HB with your thinset, but....
I would leave the stuff in place, use your thinset (I actually use
construction adhesive for this, as it is stronger and self shimming
if you use PL400 or equivalent) to stick it down and fasten with screws.
Robert gave you a good answer. You don't need to worry about the
backing left on the floor.
It can be removed with a floor scraper (4 inch or 6 inch
replaceable razor blades).
(top posted for your convenience)
Keep the whole world singing . . . .
DanG (remove the sevens)
In fact, the thinset used underneath hardibacker or any other CBU for
that matter is not an adhesive. It is merely to fill any valleys so
that the CBU has even support. I would NOT use construction adhesive.
You use unmodified thinset applied with a 1/4" notched trowel and use
the screws they recommend making sure you do NOT catch a joist.
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