In applying cement board to the floor in order to install tile, do I need to
remove glued down 25 year old Congoleum? It is secure, the wood that it is
glued to is secure, so is there any reason why it can't just stay right
Same question applying to installing click laminate flooring? (not about
installing a cement board, but about leaving the congoleum)
No need to remove in either case.
You do know you need 1 1/4" of subfloor for under tile? (this doesn't
include the non structural cement board underlayment). Some vinyl floors are
installed over only 3/4" subfloor.
Everybody is cement-board happy. I don't like using it on
floors because it has no tensile strength. Use cementboard
As a professional I use hardibacker on floors due
to it's tougher tensile strength and compression strength,
and it doesn't expand and contract. It is also highly
A good alternative for the average DIY homeowner would
be exterior-grade (CDX) plywood. A 1/2" layer glued and
screwed over a 3/4" existing floor would give the needed
1 1/4" subfloor to receive tile (use exterior grade screws-
NOT drywall screws).
Exterior-grade plywood can be gone over with multi-purpose
thinset* and is the "correct" type of plywood to use for tiling.
Look on the back of any brand or type of multi-purpose
(polymer modified) thinset, and you'll see "exterior grade
plywood" listed as an acceptable surface for it's use.
It is also very resistant to moisture. It is what roofers use
(in Florida anyway) under roofing. It is also inexpensive,
easy to cut and easy for a homeowner to work with.
NOTE: this would only be for interior use, where the
temperature and humidity is kept at a relative constant.
Plywood will expand and contract in temp. extremes.
*Always use the highest quality "flex-set" thinset over
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