Quick Answer: How To Install Plywood Subfloor Over Concrete?

Can you put 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 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 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.

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Do you need vapor barrier on plywood subfloor?

Manufacturers Require a Vapor Barrier



Your plywood subfloor may look dry, but after you install the flooring, moisture can migrate up through the subfloor and penetrate the flooring, and the results are usually disastrous. They provide sound and thermal insulation as well as moisture protection.

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 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.

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.

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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.

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.

What can I use for subfloor in basement?

Wood panels, such as plywood or oriented strand board, are common subfloor choices. However, because wood is a naturally porous substance that will absorb moisture, when used as a basement subfloor, these materials are often installed on mini-joists known as “sleepers,” which allow it to sit above a concrete pad.

Do I need a moisture barrier on wood subfloor?

Wood Subfloors



Sometimes, a moisture barrier is not recommended. If you’re installing your hardwood floors over a wood subfloor, you should avoid using a moisture barrier. Over time, moisture can get trapped between the moisture barrier protecting your hardwood flooring and the wood subfloor.

Do you put moisture barrier under subfloor?

Subfloor Material



In high-humidity areas, moisture will move to a relatively low-humidity area, even through concrete. Therefore, because concrete is porous, it’s a good idea to install a vapor barrier over your concrete subfloor before installing your flooring.

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How many layers of plywood do you need for a subfloor?

Two plywood layers would span 24 inches in most cases, but if you want to get by with one layer, spacing the joists at 16 inch centers will give you a better floor.

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