Concrete Floors Over Wood Subfloors?

Can you put a concrete floor over a wood subfloor?

Subfloors for Concrete

A decorative concrete flooring material can be installed over an existing concrete slab, a plywood subfloor or a 3/4-inch solid hardwood flooring. Concrete is a rigid material that must be installed over rigid materials. Floor joists must be perfectly straight.

Can you pour concrete over plywood subfloor?

Installing a Concrete Floor Over a Wood Subfloor

It’s best to place the underlayment over 3/4-inch-thick plywood fastened with screws at 12- to 16-inch intervals to help decrease deflection and add stability.

Can you cement over wood?

You can use overlays to create concrete surfaces that run up wood walls. Overlays are also used down wood stairs, over wood countertops, and — more often than not — across wood floors or decks.

Can you pour concrete on plywood?

Many contractors will tell you that pouring concrete over wood can be a tough job to undertake. For example, plywood is notoriously difficult to pour over since the wood is very porous and won’t allow the concrete to settle evenly. You can pour concrete over plywood floors.

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Can I put concrete floors in my house?

It’s not just for sidewalks; concrete is a stylish choice for indoor floors. Its surface can be finished in various ways—with colors, stains, and aggregates—and given a textured surface or buffed until glassy. Concrete floors are extremely durable and easy to clean, and they resist water when properly sealed.

How thick does a concrete floor need to be?

Standard concrete floor slab thickness in residential construction is 4 inches. Five to six inches is recommended if the concrete will receive occasional heavy loads, such as motor homes or garbage trucks.

What do you put between wood and concrete?

In most cases, either pressure-treated lumber or naturally durable lumber (defined by the IRC as the heartwood of redwood, cedar, black locust, and black walnut) is acceptable. In some cases, separating wood from concrete with a water-impervious membrane or vapor retarder is all that’s required.

Will quikrete stick to wood?

QUIKRETE® Advanced Polymer Construction Adhesive adheres to sheet metal, steel, pre-painted metals, concrete, brick, masonry, wood, glass, vinyl, and most plastics.

Will mortar stick to plywood?

Whatever type of plywood you are dealing with, you need to use a rated thinset mortar that is designed to be used with wood. Most thinsets are designed to only work with a concrete or fiber board underlayment, not with wood.

Can you pour self-leveling concrete over wood?

SelfLeveling Underlayment is an easy-to-use, cement-based underlayment that self-levels. Just mix it with water, pour and spread. The underlayment is excellent for smoothing and flattening interior surfaces before installing floor coverings. Use over concrete, wood, tile, terrazzo and cut back adhesive.

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Can you pour concrete over pressure treated wood?

Never pour concrete, then place the pressuretreated wood. Always pour concrete around wood, never under the wood.

Can you screed over wooden floorboards?

Screed is commonly used in wood flooring installation projects. The ideal way of ensuring your subfloor is level and smooth, screeds are relatively easy and quick to lay. Screed can be applied to structural concrete or to insulation to create a thin, level surface on which your wood floor can be installed.

How do you install hardwood on concrete with plywood?

Lay 6-mil polyethylene sheeting over the concrete to minimize moisture migration from the concrete up into the wood flooring. Then fasten 3/4-in. treated plywood to the concrete with concrete screws spaced every 16 in. Alternatively, screw rows of treated 1x4s to the concrete 16 in.

How do you attach plywood to concrete?

There are three ways of attaching the plywood to the concrete floor.

They are:

  1. Screws – Concrete screws, such as Tapcons provide for very secure fastening.
  2. Powder Actuated Fasteners – Concrete nails, shot into the floor work well, if you can get them to install with the heads flush or slightly below flush.

What kind of plywood do you use for concrete forms?

Virtually any “Exterior” rated APA panel can be used for concrete formwork because all such panels are manufactured with moisture resistant adhesive. For concrete forming, the plywood industry produces a special product called Plyform®, which is recommended for most general forming uses.

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