Question: How To Install Plywood Subfloor Over Joists?

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.

Does subfloor have to be tongue and groove?

For subflooring, you use tongue and groove plywood. The tongue and groove are only along the 8 foot edges. On the four foot edges, your seams will fall on joist tops, so no need for tongue and groove.

Which side of plywood subfloor goes up?

Using OSB Safely The side stamped “This Side Down” is typically the smooth side. This is mostly for roofers so that they lay the smooth side down and can stand on the rough side facing up. When installing in vertical applications such as wall sheathing, you’ll want to orient the smooth or stamped side facing out.

How do you install plywood over subfloor?

Instructions For Installing Another Layer Of Plywood

  1. Acclimate the underlayment. Store underlayment in the room it will be installed in for 72 hours before the actual installation.
  2. Clean the subfloor.
  3. Start installing the plywood.
  4. Staple the boards in place.
  5. Fill the seams.
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Can I use screws for subfloor?

Screws need to be twisted into the subfloor, which takes more time than simply shooting a nail into subfloor material. However, some screw guns, like the Senco DuraSpin DS440-AC, are auto-fed. A collated strip of screws in this case makes screwing subfloors a little faster, although it’s not as swift as nailing.

How do you fasten subfloor to joists?

Use a heavy-duty drill to drive Phillips head wood screws through the subfloor into the floor joists. Drive the screws approximately 8 inches apart. To make the job easier for you and the drill, we suggest that you pre-drill holes before screwing the subfloor down.

Is it better to use OSB or plywood for subfloor?

The National Tile Contractors Association and the Resilient Floor Covering Institute both recommend plywood for subflooring and underlayment, because it doesn’t have the risk of swollen edges that OSB does. Plywood also has a slight advantage in stiffness, which means that subflooring panels need not be quite as thick.

What is the difference between subfloor and underlayment?

Basically, subfloors are a structural part of your home that provide strength and rigidity to your home’s flooring. Underlays, on the other hand, protect your floor covering from moisture, help soundproof your floor, and offer cushioning and comfort underfoot.

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.

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What happens if you install subfloor upside down?

2. Upside-down Installation: Panels may be sanded on one or both sides. Installing some panels with the trademark side up may result in a slightly uneven surface. If bulk water is present on the subflooring panels, drill drainage holes or sweep the water off.

Does plywood have a good side?

The non-construction grading for decorative hardwood plywood is an alpha character first for the good side, and a numeric character for the secondary side. A good face would be an “A” and a secondary face (the back) may be a 1-4. The higher the number, like “4” indicates plugs, defects of different kinds, etc.

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.

Should you lay plywood over plank subfloor?

Take time to make sure your existing planks are well secured in place. Repair any broken planks. Install a layer of at least ½” or preferably 5/8” ply over the existing planks. Like all wooden flooring products, it’s a good idea to acclimatise your plywood before laying it.

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