How flat does subfloor need to be for vinyl plank

To have a good quality installation, you must prep your floor.
Always follow your floor manufacturers installation guidelines.
lvtflooringsto...

[@toubeelo1979]

Subfloor doesn't need to be level for LVP. It just needs to be flat. For example, LVP can be installed on a slope as long as it's flat. No one would ever install LVP on a slope, but it's just an example.

[@Jayjay-ji7ty]

Level is a bad word flat works

[@cooterhead_jones]

Luckily, my family likes bouncy lots.

[@kenmitchell3355]

Nice video. Can I screw 1/8" hard board or 1/4' plywood under the laminate if the floor is a little uneven.

[@lvtflooringstore7687]

depends on your subfloor; best practice is to use cement based self leveler on low spots, and if possible to grind, sand high spots.

[@susanwilliams3598]

Would you recommend wpc or spc lvf if subfloor is uneven

[@lvtflooringstore7687]

Most manufacturers recommend a flatness of maximum 1/8" in 6 feet. WPC floor is more flexible so for any unevenness in floor that 1/8" or less in 6 feet would be more forgiving.

[@HonchoBobbyD]

So I can't find the exact answer on this and it's driving me crazy. When the spec calls for 3/16 of an inch within 10 feet does that mean if the floor dips over say a 5'x6' area to about 1/8 of an inch that's okay? It doesn't need to be absolutely flat? I wish there was a visual demonstration of what they are meaning when they say that, it would be so much easier and perfectly clear.

[@friendswithben6437]

Not much help from me, but I'm asking myself the same kinda questions. Max 3/16" over 10 ft sounds clear enough, but what if you lay a level down and it's perfectly flat for 4 ft at each end of the level, but in the middle 2 ft it's out by 3/16"? That would suggest 5x the amount of curvature vs a smooth curve over 10 ft. But they say "or 1/8 over 6 ft", which might indicate that the maximum acceptable depth of fault is proportional to the size of the gap. So, maybe if there's an imperfection under half the width of your tile, you can ignore it, but otherwise you can measure the width of the imperfection and scale the acceptable depth linearly.

[@adriannunez2843]

You'are right! Flat, but not perfect.

[@redwood_shores]

Right, it doesn't need to be perfectly flat. Just make sure that the surface curvature is smooth and steady, without sharp peaks and depressions. I.e. rolling hills is okay, ridges and gorges isn't.

[@eddiecardona8584]

What does 3/16 “in10’ mean

[@lvtflooringstore7687]

3/16 of an inch in 10 feet refers to the maximum allowable deviation from flatness over a 10-foot span. It essentially means the floor surface should not have any high points or dips that exceed 3/16 inch within that 10-foot measurement. This tolerance helps ensure a smooth and level surface for installing flooring materials. Here's a breakdown: Flatness: This refers to how level the floor surface is, without any significant dips or ridges. Tolerance: This is the maximum allowable deviation from perfect flatness. In this case, the tolerance is 3/16 inch. 10 feet: This is the reference length over which the flatness is measured. This specification is commonly referenced in industry standards like ASTM F-710 for hard surface flooring installations. Flooring manufacturers often refer to this standard in their installation instructions.