Readers ask: How To Install Subfloor Over Concrete?

Can I put a 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.

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

Wood structural panels suitable for use as subflooring material should be plywood or oriented strand board (OSB) with a bond classification of Exposure 1 or Exterior.

Can you install plywood floor over concrete?

If you‘re installing plywood over an existing dry concrete floor, you shouldn’t have any problem. However, a new concrete floor contains a lot of moisture. So, you need to allow it to cure for at least 60 days before even bothering to check the moisture level.

How do you install sleepers on a concrete floor?

Place the sleepers in mastic around the room’s perimeter, abutting their ends. Secure them to the slab with 2 1/4-inch powder-actuated fasteners or masonry nails. Using the same methods, place sleepers across the slab on 16-inch centers, perpendicular to the direction the finish flooring will run.

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Do I need a vapor barrier between concrete and wood flooring?

Do I need a vapor barrier for hardwood floors?” The answer is YES! Moisture can destroy hardwood flooring. It causes cupping, warping, and even mildew if not treated. You must install a moisture barrier to protect your flooring from water wicking up from below.

How do you stick plywood to concrete?

One way to attach plywood to a concrete surface is to screw it into place with concrete fasteners. Another way that involves less strain and hard work is to glue the plywood to the concrete. This only requires a few materials and will adhere the plywood very securely in place.

What is the best flooring to put over concrete?

Best Flooring for Concrete Slab Foundation

  1. Engineered Wood. Natural hardwood flooring offers undeniable beauty and durability.
  2. Vinyl. As a longstanding choice for kitchens and bathrooms, vinyl has a reputation for extreme water resistance.
  3. Laminate.
  4. Carpet.
  5. Tile.

How do you lay plywood on concrete?

Plywood-on-slab.



Place a 6-mil polyethylene vapor retarder directly over the concrete. Lay 3/4-inch plywood sheets opposite to the direction of the finish flooring, leaving a 1/4-inch gap between panels to eliminate squeaking. Fasten the plywood to the concrete using powder-actuated fasteners or concrete nails.

How do you attach wood to concrete without drilling?

If you are willing to make holes in the concrete but do not want to buy the particular drill bit needed, then the simplest solution is to get nails for your project. Standard nails will not work on concrete, but some nails are made specifically for nailing wood to concrete. Cut nails will also work for this as well.

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How do you insulate a concrete floor?

Insulation above a concrete floor



Lay the damp proof membrane onto the concrete, followed by the insulation. Then lay moisture-resistant chipboard, or a concrete screed to the top, which can then be covered by the flooring to finish.

How do you attach OSB to concrete?

Put PT 2x4s down flat and then screw the OSB to it. Drilling into the concrete could cause water seeping in and your floor is probably not level so you can shim the sleepers. Also put some hard foam insulation between them. It will help keep the shop warm.

What is a floating subfloor?

A floating subfloor is flooring that actually never touches cement underneath. It “floats” or rests on top of a waterproof underlayment instead. This may be made of various materials including polyethylene, plastic, or styrofoam.

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