Using leveling compound on plywood subfloor (second story)


That looks like an almost non-issue (especially if the flooring will run the same direction as that level, if not you'll need to do something about it). If it's a low traffic area it might not concern me in the slightest.

I HATE, quote, "self leveling" compound. It should called: aww crap, now what? (you had better know how to trowel concrete) And if you're going to use nails instead of glue, then leveling compound is out of the question. It will crack when you shoot nails into it and the flooring won't sit right on all the crumbs.

I'd either floor right over that, or lay down a new 3/8 plywood sub-floor over the whole thing (with none of the old seams lining up, and nowhere shall four corners meet; T junctions only).

I would not use felt and I wouldn't worry about having to tape that seam if you're going to use leveling compound. But you could try using strips of luan (1/8" plywood), cut to fit that gap as large as possible, so long as they're still underneath...

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Last Updated May 08, 2017 17:21 PM

The previous owner of my house tiled all the bedrooms on the second floor. I would like to remove all the tile and lay down hardwood flooring. So far I have removed the tile and now have all the thin set underneath. My question is whether it needs to be completely removed with a grinder or if we can use a very thin layer of self leveling cement to fill in all the grooves and make a level surface on which to lay the hardwood flooring? On the first floor there is a concrete slab and I used an industrial concrete grinder to remove all the thinnest. That worked great but I am concerned that this type of machine will just rip through the subfloor. And the idea of grinding off all the thinnest with a hand grinder seems like it will take forever. Any suggestions on the self leveling compound and if so which product would be recommended? Thank you

Answers 3

If the thinset is sound and without damaged or loose...

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Extreme House Flipping

10 мес. назад

In this How to use floor leveler to fill low spots before laying new flooring lake house renovation video, brothers Dave and Rich prepare to fill low spots on the kitchen floor by using tec ez level - a fine concrete mixture used to fill low spots before laying an engineered hardwood floor. First, a multi-purpose primer was painted, or rolled, onto the floor to improve adhesion of the concrete lever. After drying time (45 min), the lever was mixed into 5.25 quarts of water with a drill for 3-5 minutes. Then the leveler was poured and smoothed with a trowel. Work time for the leveler is 15-20 minutes. Can be walked on in 2-4 hrs. Can be floored over in about 12 hours. The great news is that today we installed 45% of our hard wood in the kitchen and great room of the lake house, and all was well, which means the floor leveler did its job!!! Hoorah!!! You can support our channel by purchasing anything on Amazon. Just click...

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I'm replacing about 1000 sq ft of carpet throughout a split level home with laminate.

My first step is the master bedroom and out into a hallway.

When I pulled up the carpet in the master, there was black carpet pad glued to the plywood. I've got the pad scraped off and most of the glue removed after several weeknights after word. (as an aside I wonder whether I could have just rolled out thin foam underlayment directly over the black pad and simply installed the laminate, but I want to do this right)

Now I need to flatten the floor. I've already sanded high spots where the plywood sheets meet. But there are a number of low areas and some divots from scraping. The low areas are no more than 1/2" deep and the biggest area is about 3' by 3'.

It appears the consensus is to use patching compound as opposed to shingles and layers of felt paper.

This problem is, there doesn't seem to be anything anywhere that provides specific advice on using patching compound...

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Self leveling compound has little flexibility. Once dry it will crack and crumble if deflected too much. It is fine over concrete because concrete has virtually no deflection except for bridge decks,high rise floors, which require additives.
Also plywood tends to suck the water right out of the self leveling compound before it cures - making another problem in itself.
I would suggest this - Purchase a small pc of rubber membrane like the use on flat roofs. Trim it to fit against walls, make cut out for around stool flange,registers,etc. Glue down to the plywood.
Now purchase either 1/4" durock cement board, or 1/4" aqua board. Screw it down over the rubber and into the existing plywood. If you want a smooth finish floor take Thinset mortar and trowel it on over the cement board. Apply at least 1/2" thick. Smooth out with concrete trowel or take a masonry brush and put pattern of brush strokes in the concrete. You can now apply a one or 2...

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A self leveling compound can be applied to most types of subfloor materials. You can apply self leveling compound to plywood, osb, concrete, cement board, hardibacker and many other types of subfloor materials. You can also use self leveling compounds when installing tile over top of an existing tile installation. Self leveling compounds will not add any stability to a sub floor that is flexing or shifting. It is important to totally stabilize the subfloor before applying the self leveling compound.

Stabilizing a subfloor may involve adding more floor joists or sistering the existing floor joists. Also a second thicker layer of a wooden subfloor will also help to stabilize a flexing subfloor. If you apply the self leveling compound to a floor that is flexing then it will crack and shift as the floor is being walked on. Also the tile and grout will start to crack as well if they are installed on top of this type of flexing subfloor. If you can walk...

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There are two options for a wooden floor: plywood and OSB. The information below will help you to choose the most suitable for your needs. A subfloor may raise a floor's height and stop a door opening smoothly. Do not trim a door until after you lay flooring: it may be possible to hide a slight step between rooms with a threshold strip.

Choosing to Use Plywood
Use thick plywood as a subfloor for hard tiles, and thinner ply to provide a smooth surface for soft floor coverings such as vinyl, carpet, and soft tiles. Large sheets are ideal for large rooms, because they cover the surface quickly and with fewer joints. The order in which boards are nailed down is not important, except that joints between rows of plywood boards should be staggered to avoid long joints.

Laying Plywood
Decide what type of floor covering you wish to use before laying plywood, because stability and compatibility for the type of floor covering is essential. Before buying plywood,...

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In this video you'll see how you can do plywood subfloor leveling using the plywood sheets. I was going to install a hardwood floor (5/8" thickness) but there was a problem with subfloor: a tile was 1,5 " higher. How to solve this issue? Easily! Make new plywood subfloor installation! In this video you'll see how I am leveling wood subfloor for hardwood floor installation. Leveling wood floor is possible with plywood, cork and self-leveling compound. First of all you need clean up plywood subfloor from dirt, dust, old paints, and glue and so on. Now watch this video and you'll understand how to level a plywood subfloor and make sure that you can do this job yourself. You can use this simple technique even for the concrete subfloor. THINGS I MENTION IN THIS VID: -Makita Cordless Circular Saw - SUBSCRIBE FOR MORE VIDS! ALSO FIND ME HERE:...

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Floor Leveling Compound For Plywood Subfloors

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Laying a tile floor is not as hard as you might think and can save the expense of having it professionally installed. To get started you’ll need:


Pencil Tape measure Level Speed square Notched trowel Rubber float Grout sponge Tile spacers Power drill Mixing paddle 5-gallon buckets Kneepads Safety glasses and earplugs Scoring cutter or wet saw Handsaw or jamb saw


Tile Thin-set mortar Cement backer board Cement board screws Grout Sealer

Measuring Floor

Measure your floor carefully and calculate the number of square feet needed.

For square or rectangular rooms, multiply the length of the room by the width, rounding all measurements up to the nearest foot. Divide odd shaped rooms into square or rectangular sections. Calculate the square footage for each section and add them together.

Purchasing Tile

Tile comes in a wide variety of sizes, styles, and colors. Keep these points in mind when deciding on...

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