Like Sturd-I-Floor, Rated Sheathing may be plywood or OSB. When used as a subfloor, Rated Sheathing typically requires installation of an additional layer of underlayment on top of it before finish flooring can be applied. The underlayment requirements vary depending on the finish flooring.

Can I use OSB sheathing for subfloor?

Most local codes allow OSB to be used for subflooring. It’s always best to check with your local permitting office before using OSB for your subfloor. One advantage that OSB has over plywood is its larger formatting. For plywood, 8-foot and 10-foot long sheets of plywood are standard.

What type of plywood is best for subfloor?

Cheap and strong makes CDX plywood great for use as a structural panel such as a subfloor. Remember the letter grade of plywood only has to do with cosmetics and not strength. CDX plywood is just as strong as higher grades. CDX is a type of plywood that grades C, D or X.

What is the best material to use for a subfloor?

Plywood is considered the most popular material used for subflooring, it has been used since the 1950s and remains one of the top choices for contractors. Standard plywood works perfectly fine as a subflooring material, but the best option is ¾” tongue-and-groove plywood subflooring.

What is the difference between sheathing and plywood?

The biggest difference between the two panels is how they react when exposed to large amounts of moisture over extended time periods. … When used as a roof sheathing, this tendency to hold moisture means it can degrade faster than plywood when exposed to chronic leaks.

Which is stronger plywood or OSB?

OSB and plywood offer similar (and sufficient) performance in terms of strength and functionality, though plywood is about 7% stronger. … Plywood will absorb moisture quicker than OSB, but consequently it will also dry quicker.

What is the difference between plywood sheathing and subfloor?

They are not the same. Plywood sheathing is most often used to construct the structural sub-floor. Plywood sheathing can either be OSB or all plywood. We will discuss these types of plywood sheathing, sub-floors and plywood underlayment in this blog post.

How thick is typical subfloor?

Thicknesses for products used for subfloors are generally 23/32 inch (just under 3/4 inch), but thicker sheets are available where building codes call for them.

What do builders use for flooring?

Plywood Subflooring Plywood has been a standard subfloor material since the 1950s and remains the preferred subflooring for many builders. Standard plywood can be used for subfloors, but a better material is 3/4-inch tongue-and-groove plywood subflooring.

Is it OK to use treated plywood for subfloor?

There’s no need to worry about making treated wood safer that is completely covered in other materials and hidden from access, such as subflooring. Pressure treated wood doesn’t release any gases or particulates that could harm you and your family.

Article first time published on

Can I use plywood as flooring?

Plywood floors are suitable for any room where you’d otherwise install hardwood, though kitchens and bathrooms are less desirable since frequent water spills are likely. … A 1½-in thick, 4-foot by 8-foot sheet of CDX plywood (the kind used in subflooring) sells for around $15.

What is sheathing plywood used for?

Sheathing: Standard construction plywood used for wall sheathing, roof decking, floor structures (subflooring) and general rough construction where looks and surface imperfections aren’t important.

Does subfloor need 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.

Is sheathing ply waterproof?

How is Plywood Used Outdoors? Exterior plywood is weather (and water) resistant, so it’s strong enough to be used outside and also in areas that are exposed to water and humidity, like a garage. This type of plywood, often made from Douglas fir, is made stronger by adhering its layers with a waterproof glue.

How many layers of subfloor do I need?

In the US, ¾” is common, but that’s still one layer. They sell it in flooring thickness. Just 1 layer of 3/4 “ or 5/8” will do for most applications. If your finished floor is going to be heavy ceramic tiles, natural stone, and alike it may need to be thicker and or have more supports.

Can subfloor be used as floor?

Concrete subflooring is acceptable as regular flooring, as long as it’s in a moisture-proof environment. Consider the long-term effects of leaving your subflooring exposed.

Can I use CDX for subfloor?

OSB and CDX subfloors come in tongue and groove. It’s ideal for subflooring, because it prevents the edges of the plywood from moving and squeaking after insulation. Construction adhesive is used to better seal the tongue-and-groove joint.

How thick should subfloor plywood be?

The minimum thickness of plywood for subflooring is about 5/8 inch. Since it does not hold fasteners as well as plywood, OSB must be a little thicker, or at least 23/32 inch.

What holds screws better plywood or OSB?

Group 1 plywood, made from the strongest species of wood such as Southern Yellow Pine, holds screws better than OSB.

Why is OSB more expensive than plywood?

Oriented Strand Board, or OSB, has long been used as a low-cost alternative to plywood, but the product now fetches a higher price as increased demand and tight supplies lead to delivery delays and elevated construction costs in the United States and Canada.

Is sheathing plywood strong?

Plywood sheathing or structural plywood is designed for permanent structures. It is strong and inexpensive but unfinished and therefore not suitable for places where it will show. It should be covered by other types of materials. Use plywood sheathing for framing, beams, flooring and bracing panels.

Is MDF good for subfloor?

Modern density fiber (MDF) is an excellent choice for your underlayment since it’s cost-effective and easy to work with. You can use MDF as underlayment but it is best used in areas not prone to moisture. MDF sheets of 18-22mm are a high-density material that provides a consistent finish and resistance.

How do you waterproof a subfloor?

Caulk any seams where two pieces of plywood are butted together. Dab caulk onto nail or screw heads to seal the potential leak point they provide. Caulk any splits in the wood or any other areas that may provide a point for water to seep under the subfloor.

What is the most popular flooring in homes today?

  • LVT (Luxury Vinyl Tile) Pros. LVT has become our most popular choice for home flooring, and for many good reasons. …
  • Hardwood. Pros. Another popular option, modern hardwood flooring is now available in both solid and engineered woods. …
  • Carpet. Pros.

What is 3/4 plywood called?

Nominal ThicknessActual Thickness1/2“15/32“5/8“19/32“3/4“23/32“1-1/8“1-1/8“

How much does subfloor cost?

Average Cost of Replacing Subfloor. Replacing subfloors will cost between $1.45 and $7 per square foot for materials. Labor costs will be around $27.50 per hour. The project requires the removal of the finished flooring and damaged area and the installation of a new material.

Why is treated lumber cheaper than untreated?

Affordability. Pressure-treated wood is notably cheaper than cedar, redwood, and other types of wood. And, because of its durability, you’re much less likely to experience a need for costly repairs in the future. It is a great choice for those operating on a smaller budget.

Can I leave my deck untreated?

It is highly unlikely that the deck will rot, splinter or decay if you choose not to have it finished and you can always choose to stain and protect the deck at a later date.

What applications might you use OSB versus plywood?

OSBPlywoodUsesRoofs, Walls, SubfloorsRoofs, Walls, Subfloors, Boxes, Packages, Sports equipment, Musical equipment, Playground equipment, High-end loud speakers

Is 12mm plywood OK for flooring?

Due to our 12mm Hardwood Plywood being a structural product – it can be used in sheds for roofing and flooring too. An interesting application for 12mm Ply is Plywood pegboards – a quirky addition to any home, plus they’re super easy to build.

What is the cheapest way to do flooring?

  1. Vinyl. Vinyl flooring comes in sheets, tiles, and planks and is predominately manufactured with PVC, resulting in durable, waterproof flooring that can be installed anywhere in your home. …
  2. Sheet Vinyl. …
  3. Plank Vinyl. …
  4. Laminate. …
  5. Cork. …
  6. Carpet. …
  7. Tile. …
  8. Refinish Your Floors.