FAQ: Plywood Subfloor Which Side Up?

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.

Does it matter which way you lay plywood?

It is exceedingly important that the first whole line of plywood sheets be perfectly straight and square. Each subsequent piece of plywood will depend on the first piece being installed correctly. If you do this properly, you’ll have a beautiful plywood subfloor.

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.

You might be interested:  Often asked: How To Sheet Plywood Sheets That Arent Warped?

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.

Which side of plywood is good?

General Baltic Birch Grades: What To Know: plywood is graded on the appearance of the face and back veneers only (not the core). The better side is called the face, the poorer side is called the back. These grades listed below read “face/back.”

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.

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.

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.

You might be interested:  Readers ask: Where To Buy Plywood For Bed?

Do you have to use tongue and groove plywood for subfloor?

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.

How do you install plywood over existing 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.

How do you waterproof a subfloor?

Apply a bead of the silicone caulk around the entire perimeter of the subfloor. Place the angled part of the nozzle flat against the crevice between the subfloor and the bottom of the wall and squeeze the trigger slowly. Move the caulk gun evenly along the crevice to apply a bead of caulk.

Does subfloor have to go under walls?

Replacing a subfloor under a wall may become necessary if the subfloor is no longer structurally sound. A subfloor is the solid base underneath the floor covering that you depend on for the stability of both the floor and walls in a room.

Does it matter which side of plywood faces out?

More commonly, you’ll come across A/B or A/C. This means that one side of the plywood is Grade A and the other is Grade B or C. For most projects, these types of plywood will work because you can put the higher rated side facing out while the lower rated side is hidden facing in.

Leave a Reply

Your email address will not be published. Required fields are marked *