FAQ: How To Install Plywood Underlayment?

Should you glue down plywood underlayment?

No, you should not glue down your underlayment. Underlayment is is a floating material, the same as your laminate flooring. In most cases, you should not glue or nail your underlayment down. You should always check with the installation instructions of the underlayment for proper installation instructions first.

How do you screw down plywood underlayment?

Attach the smaller piece to the subfloor with a 1-inch wood screw every six inches in each direction using a power drill. Push the full sheet tightly against the small section of plywood and the wall, and attach to the subfloor with a screw every six inches.

Which way does plywood underlayment?

Install plywood underlayment smooth side up. To avoid damage to the surface, install underlayment immediately before laying the finish flooring.

Can you use plywood for underlayment?

Today, a much better option is a plywood specifically designed as underlayment and made with sustainably forested wood. You can also use AC exterior-grade plywood, which has one smooth face and one rougher face. Always install underlayment with the smoother face up.

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Can you staple down underlayment?

There is no fastening the underlayment to the subfloor. If your choose this route, staples are a good choice to fasten the underlayment. Staples usually have a coating which help increase the holding power. Using a crown compression stapler, staple 2 inches on the seams and edges with 4-6 inches apart in the middle.

Do you glue subfloor down?

The answer: Glue. Although using a subfloor adhesive (or subfloor glue) is not required by code, it is a standard practice that can help prevent floor squeaks by reducing the chance for movement at the panel-to-joist connection. A quality subfloor adhesive will also increase the overall stiffness of the floor.

Is it better to nail or screw subfloor?

Using code-approved screws rather than nails is the best option for avoiding movement. If using nails for subfloor installation, stick with ring-shank nails; smooth nails may withdraw easier, leading to squeaks.

Do you screw underlayment to joists?

The underlayment is the middle layer of the floor. This layer is installed directly on top of the sub floor. The underlayment is usually stapled to the sub floor with a pneumatic stapler, but can be fastened through the subfloor into the joists with nails or screws instead.

What screws should I use for underlayment?

Ring-shank and spiral-shank nails are the best fasteners for this application because they are grooved to increase friction and resist withdrawal. In fact, studies at Clemson University in South Carolina have shown that these nails have as much as twice the holding capacity of smooth-shank nails and staples.

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Do you need an expansion gap for plywood underlayment?

APA recommends a 1/8-inch space between panel edge and end joints. Plywood and oriented strand board (OSB), like all wood products, will expand or shrink slightly with changes in moisture content. If the wood structural panels are tightly butted, there is no room for expansion and buckling can occur.

What do you put between subfloor and underlayment?

Floors with Underlayment Installing a layer of building paper between the subfloor and the underlayment will minimize or even eliminate squeaking.

What is underlayment grade plywood?

Underlayment is a special grade of APA plywood that is attached on top of the subfloor to provide a durable and resistant layer under finish flooring. Underlayment’s special face and inner-ply construction resist dents and punctures from concentrated loads.

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