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.

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Do you need a subfloor on concrete?

While a subfloor is not necessary to add structural strength when you‘ll be laying finish flooring on top of a concrete slab (as in a basement remodel), subflooring over concrete offers two other advantages: A subfloor will help insulate against a concrete floor that becomes overly cold in winter.

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.

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.

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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.

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.

Should you put a subfloor in a basement?

Subfloors are not always necessary. They only come into play when you want to expand downward and make your basement a warm, livable space. Concrete or tile-over-concrete are acceptable floors for uninhabited basements.

What do you put under carpet in a basement?

For a dry, mold-free finished basement floor, always install a vapor barrier before laying a wood subfloor or carpet pad. See what goes into waterproofing a basement, too. Any kind of persistent moisture will allow mold to get a foothold and soon ruin carpet or wood flooring.

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Can you put carpet directly on concrete?

First things first — you can put carpet directly over concrete; however, you‘ll want to follow a few principles to help the process run smoothly. You need the right type of carpet; you need to make sure the concrete surface is level and dry, and you need the carpet to adhere securely to the concrete.

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