Can you put wood subfloor over concrete?

You need a dry, clean and flat surface before you can install finished flooring in a room built on a concrete slab. One of the simplest options is a sleeper-based subfloor. The result is a subfloor that protects finished flooring from cold and damp concrete-based floors.

Can you put plywood over concrete slab?

It is perfectly fine to install plywood over an existing concrete floor, provided it is dry. It is important to check the moisture level and ensure that it is below 6% before you attach any type of subflooring, especially plywood. Otherwise, you may have to give it more time to cure.

Can you install wood flooring over concrete slab?

If you have a concrete slab main floor or basement, you may be wondering if it’s possible to install hardwood flooring directly on top of the concrete. The short answer is yes.

How do you build a wood subfloor over concrete?

To install a floated subfloor system, first place a layer of plywood subfloor panels with the edges parallel to the wall. Use a ¾” spacer between the plywood and the wall and a 1/8” spacer between panels. Next, lay a second layer of plywood at a 45-degree angle to the first layer.

What kind of plywood do you use for subfloor over concrete?

When installing subflooring over concrete, for installation of wood flooring, it is necessary to use thicker subflooring, so that it can be nailed into. A minimum of 5/8” thick plywood is recommended, with 3/4” thick plywood being considered ideal.

Do I need a subfloor over concrete?

A subfloor will help insulate against a concrete floor that becomes overly cold in winter. The concrete slab must be clean, sound, and level, with any serious cracking repaired, before you install your subfloor. — Always check your local building code before choosing a particular subflooring material or design.

Do you need underlay for solid wood flooring on concrete?

It is important to mention that you do not need a wood floor underlay when you have a solid hardwood floor and that’s because it is not stable, hence it has to be installed mechanically to the concrete subfloor.

Can you put a concrete floor over a wood subfloor?

the wood floor is designed to carry a certain load, so the concrete you put over it should be a lightweight concrete underlayment/self leveling type product. if your ok with some cracks, and plan to seal it, your ok.

How to install a subfloor over concrete?

Lay the first layers of plywood with edges side by side to the wall without securing.

  • Plywood panels should be placed with a 1/8″ gap amid sheets.
  • Place the next layer at a 45-degree angle or straight to the first.
  • Sections of plywood should be laid with 3/4” minimum extension space at all wall lines and vertical obstructions.
  • What is the Best Flooring to put over concrete?

    Protecting Laminate Flooring from Moisture.

  • Installation and Cost.
  • Providing an Even Surface for Laminate.
  • Clean the Floor for Glue-down Installation.
  • Add Padding for Comfort.
  • Installing Laminate Flooring on Concrete Steps.
  • Use Standard Installation Practices for Laminate.
  • How to build a raised wood floor over concrete?


  • Tape measure
  • Hand square
  • Chalkline
  • Circular saw
  • Safety glasses
  • 2 by 4 pressure-treated lumber
  • 2 by 6 fir lumber
  • 3-inch concrete nails
  • 16d sinker or box nails