I have a kitchen floor that is on a concrete slab. Above
the slab is old asbestos tile, and above that is a vinyl
sheet floor. Now that hardwood has been installed around
the kitchen, I want to bring up the level of the kitchen
floor to at/near the hardwood (about 1/2" higher), and put
down new vinyl too. I plan on putting down 3/8" underlay-
ment, then vinyl, then some threshold molding to join it
with the hardwood.
1. What type of material should I use for the underlayment?
2. What fasteners should I use to anchor it through the vinyl,
asbestos, and into the concrete?
3. How much space should I leave at the seams between sheets?
4. How much space should I leave at the wall edges?
Plywood. (NOT any kind of OSB, chipboard, or particlae board.) Get the
best that plywood you can afford, so far as surface quality is
concerned. At a minimum, you should be getting "B/C sanded one side".
A/C is even better.
There's lots of things that you could use. I'd probably opt for Tapcon
screws. The biggest problem that you will have is that you MUST
countersink the heads of whatever you use -- but you got to do that
without drilling the countersink all the way through the ply.
Make sure you cover the countersunk screwheads/nailheads with a
hardening putty or floor-leveling compound.
Absolutely none. In fact, if you can find a tongue and groov plywood
in that thickness/grade, go for it. After all of the ply is in place,
you'll need to "mud" the seams with a floor-leveling compound. For
vinyl flooring, it is rather important that there be NO voids in the
Plywood doesn't move very much at all -- that's one of its big
advantages. leave about 1/4 inch, just so that you can work with the
That's complete nonsense. professional installers nationwide use
particle-board underlayment for vinyl..
IMHO the rest of your advice is moot. With the real possibility of
sheet underlayments of any kind coming loose when installed over a slab
it's best not to do so in the first place and use transitions to deal
with the elevational differences.
OK, if I take your advice, can I put the new vinyl over the old vinyl
without pulling it up first? It is glued 100%, not just the edges.
If I can put it over the top, what adhesive should I use that will
fill in the slight pattern (very shallow indentations in the design)?
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