FAQ: How To Build A Subfloor On Concrete?

Can you put 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 lay plywood 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.

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.
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What is the best flooring to put on a concrete floor?

Ceramic tile is the designer’s choice, with tons of colors and styles. It’s unaffected by moisture and goes directly onto concrete that’s smooth and free of cracks. Vinyl tile and sheet flooring also goes directly over prepared concrete and will withstand even minor flooding with no ill effect.

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.

How do you lay plywood subfloor on 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.

How do you secure plywood to 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 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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How do you insulate a raised floor over concrete?

There are two ways to handle insulating concrete floors. You can attach wood sleepers to the floor, fill the gaps with rigid-foam insulation, and then apply your finish flooring. Or, as demonstrated here, you can cover the slab with rigid-foam insulation, add two layers of plywood, and then add the finish flooring.

Do you need a vapor barrier under a concrete slab?

Water vapor will always move from a high relative humidity environment below the building into an area of low relative humidity – even through concrete. That’s why nearly every expert in the concrete industry recommends a belowslab vapor barrier to stop the vapor drive of water upward and into your building envelope.

Will Liquid Nails stick to concrete?

Liquid Nails is a high strength multi-purpose construction adhesive suitable for bonding timber, plasterboard, MDF, particleboard, masonry, concrete, tiles & ceramics, metals, plastics*, rubber and glass.

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.

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