Often asked: How Far Over The Plywood Does Underlayment Need To Go?

How much space do you need between plywood underlayment?

The plywood needs to be 5/8- to 3/4-inches thick to support most types of wood flooring, and each sheet should have a tongue and a groove so that the joints will be stable and waterproof. The joist spacing needs to be no more than 24 inches to accommodate a plywood subfloor.

Do you need underlayment over plywood?

All floors aren’t perfectly flat so having an underlayment can hide the small minor imperfections giving your room a near perfect look. Moisture protection will not have any benefit to laminate flooring on plywood as most plywood subfloors are usually installed on the main or second level of a house.

Does plywood underlayment need to be staggered?

The end joint is where one board or plywood sheet butts up against another. In almost every situation, it’s important to stagger these joints to avoid straight lines that extend in a perpendicular direction across the lengths of the boards.

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.

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How far apart should screws be on underlayment?

Generally, nails (6d ring or screw shank, or 8d common) should be spaced 6 inches on center along supported panel edges and 12 inches on center on the panels’ interior supports, or as specified on the construction drawings.

What is the best plywood for underlayment?

Poplar or Birch Plywood with a fully sanded face and exterior glue. Lauan Plywood, when used as an underlayment, should be Type 1 (Exterior). The best grade is BB and the next best is CC, while OVL (overlay grade) is the minimum acceptable face grade. There is a wide variety of quality and species classed as lauan.

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.

Should underlayment be screwed 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.

Do you stagger plywood?

More plywood sheets are nailed down, staggering seams for a stronger fit. When you build, you always stagger. It’s what makes a pile of boards and materials into a solid structure. Stagger stagger.

Should you stagger underlayment?

Never line up the underlayment seams with the subfloor seams; stagger the underlayment at least 2 inches with the subfloor seams. This adds to the stability of the floor and helps to defeat the broadcasting of lines through the resilient floors. When nailing underlayment, don’t think that longer nails are better.

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Do you glue down plywood underlayment?

Things You’ll Need Gluing down plywood underlayment affixes it very firmly to the floor. Many people don’t bother to glue down their plywood underlayment. Instead, they just screw or nail the boards to the subfloor. This is fine if you’re not worried about the long-term durability of your work.

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.

Do 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.

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