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jbwaechter April 3, 2013 11:17 AM

Existing 1/4 inch underlayment has carpet adhesive - how to prep for floating LVP?
I'm installing a Mannington Adura luxury vinyl plank floating floor in my kitchen/dining room. Existing rooms are currently carpeted (yes, carpet in the kitchen....ugh.) Subfloor is two layers of 1/2 inch plywood (seems solid and looks to be in good shape/flat.) Kitchen has an additional 1/4 inch underlayment (nailed to subfloor), and the kitchen carpet was glued down to this underlayment. Dining room has carpet with tackless strips and padding stapled to subfloor, but does not have the additional 1/4 inch underlayment.

So I've got a difference in height that I need to address by either removing the kitchen underlayment (which removes the old adhesive too) or adding a layer of underlayment to the dining room. (It's an open floor plan - the rooms are really one big open space so a transition/reducer strip is not desirable.) What would be your recommendations to prep these floors for the Adura floating floor? Will the old adhesive cause problems for the LVP if I put it directly down on the existing underlayment? I'm leaning toward just removing the kitchen underlayment and adhesive, but I'm not sure what condition the kitchen subfloor will be in after prying up the underlayment.

Mike Antonetti April 3, 2013 01:07 PM

Is the existing glue brittle or gummy?
Is the underlayment also glued?
How well is the underlayment nailed?
Is the floor sturdy, minimal up and down movement.

jbwaechter April 3, 2013 01:12 PM

Existing glue is brittle in some places, gummy in others.
The underlayment is nailed down only.
I don't know how well it is nailed down, but based on how well everything else in the house has been built, I'd expect it to be nailed down well.
The floor is very sturdy (no bounce/movement that I can sense.)

FYI, the kitchen is about 150 sq ft, the dining room is about 450 sq ft (not sure if that would sway someone one direction or the other.)

Mike Antonetti April 3, 2013 01:30 PM

I personally would pull -start small, maybe a fill piece, then go from there, you may end up having to patch some plywood areas.
Then use a patch where needed to ensure smooth.
Use caution with the nails.

kwfloors April 3, 2013 10:09 PM

Just about every floor for vinyl or lino, I put more fasteners on the joints. Then I would scrape what I could of that adhesive off and vacuum. Then float it all with a cement based patch, which would take away the stick from the carpet adhesive. I would use a touch of latex with that patch mix too.

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