floorflooringlaminate-floorsubfloor
There is floating LVP currently installed in my kitchen which needs to be replaced. Underneath it is glued-down laminate.
There is a small section of the floor that dips down that I would like to level if possible. Can I apply floor leveling compound ontop of the glued down tiles?
If the gashes you describe are not large, say more than 1/4 inch deep or more than say 6inX6in in size, don't worry about them. go right over them. If you really feel that they need to be filled, use the floor leveler. it does contains silicates which is only harmful in a dry dust state, and then only if you live in the stuff for a long long time. Once it is wetted/mixed and on the floor , there is no danger if you don't go crazy sanding it. You can also use regular drywall compound or quick set if you have the patience to wait for it to dry before starting your floor.
I like taking small crowns out of concrete floors with diamond cup wheel attached to an angle grinder... Need a shop vac and a masked helper. You may be able to rent both.
Best Answer
SLC is typically rated for install overtop of L/360 floors. Assuming your glued down laminate is well adhered to the substrate below it and that substrate is a minimum of 1.25" thick (almost no wood floors are), then the SLC would be approved for that purpose. The two SLC I am most familiar with are Sika and Mapei.
I've installed SLC on 5/8" tng plywood using the wood primer. The SLC generally develops hairline cracks but as long as it doesn't allow deflection and pieces of it can't delaminate and migrate under pieces of the flooring causing noise then you should be ok. If you are installing underlayment on top of the SLC then noise is less likely.
One trick often employed is to get a stiffer underlay and add an extra piece to this area. It depends what the height difference is. Or you can use door skin or a combination of the two.
The best approach depends on your budget, how picky you are for your floors being quiet / flat and the install method for the new floor.