Can I use pressure treated plywood for subfloor?

Agreed. Under the IRC this 19% or less moisture content lumber is called kiln-dried-after-treatment lumber and is perfectly acceptable to be used in structural sheathing, subflooring, or framing.

Furthermore, can I use pressure treated plywood as subfloor?

No. You should not use PT ply. You should/might consider using ACX Underlayment ply, which is a sanded face exterior rated ply with waterproof glue, no voids in the lams, and a higher crush rating than standard sheathing/flooring ply.

Subsequently, question is, what material is used for subflooring? Plywood

Likewise, people ask, can you use treated wood for subfloor?

Kiln-Dried-After-Treatment Agreed. Under the IRC this 19% or less moisture content lumber is called kiln-dried-after-treatment lumber and is perfectly acceptable to be used in structural sheathing, subflooring, or framing.

Can I use pressure treated wood for floor joists?

It's a building code requirement to use treated lumber where wood contacts masonry. This treated lumber resists wood rot as it's immune to damage from moisture. This treated lumber is bolted to the foundation and the floor joists typically rest on it.

33 Related Question Answers Found

How thick should Plywood be for flooring?

The National Wood Flooring Association recommends a minimum plywood panel thickness of 7/8-inch for joist spans of 19.2 to 24 inches, and a minimum plywood panel thickness of 5/8-inch for joist spans of 16 inches or less.

What kind of plywood do you use for a subfloor?

While OSB is the most popular structural panel, CDX plywood is the most popular type of traditional or "veneer" plywood. CDX plywood is like other laminate plywoods, but the outer layers of laminate are grades "C" and "D," which means they are cosmetically rough and contain many imperfections, thus lowering their cost.

What type of plywood is used for bathroom subfloor?

Traditionally, exterior grade plywood has been the subfloor material of choice for many bathroom flooring projects. Plywood is made by gluing alternating layers of wood veneer. CDX plywood (¾”) in particular is used often because it has a high level of resistance to moisture and humidity.

What is better for subfloor OSB or plywood?

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.

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.

Why do campers get soft spots in floor?

A soft spot in the floor of your RV—whether it's a motorhome, pop-up, or camper trailer—is something you simply cannot ignore. The soft spot usually means a leaking roof or perhaps plumbing problems, either now or at some time in the past. Dutchman travel trailer with a damaged floor.

How thick should a bathroom subfloor be?

Make Sure Your Subfloor is Structurally Stable

The installation guide for 1/4 inch HardieBacker recommends having wood subfloors made of 5/8 inch exterior grade plywood or OSB (oriented strand board) that is 23/32 inches thick.

Why can't you use pressure treated wood inside?

The simple answer is pressure-treated lumber can be used in any interior application except cutting boards and countertops. The reason lumber is treated is to protect it from exterior elements that might cause rot, decay or termite infestation.

What kind of wood is CDX plywood?

CDX is a type of plywood. Basically, plywoods are thin veneer sheets that are glued and held together with linking plies. Plywoods are known for their strong resistance to cracking, breaking, or twisting. There are different grades/classes of plywood which are represented by letters A, B, C and D.

Can you lay tile on treated plywood?

While tile can be laid on plywood, do not install tile directly onto the plywood subfloor itself. Use intervening layers of two sheets of plywood.

How many layers of plywood do you need for a subfloor?

Floating subfloor: There are two common methods for this. The first is to lay two layers of 3/8-inch plywood over the slab without fastening or gluing them to the slab. One layer is laid, and the second layer is stapled or glued perpendicularly or diagonally over the top.

How thick should a subfloor be?

Typically made of plywood or OSB and ranging in thickness from 19/32" to 1 1/8" thick, the subfloor is truly structural, second only to joists in this respect. Subfloor holds up all of the above layers of flooring, as well as everything in your house—people, dogs, cats, pianos, furniture. All houses have subfloors.

What is the best subfloor material?

Plywood

Can I put new subfloor over old subfloor?

One of the benefits of removing the old flooring is it allows you the chance to fix any loose subflooring or squeaks by re-securing the main subfloor to the floor joists prior to installing the new flooring. With all that being said though the answer is YES you can install New Wood Flooring over the old.

What's the best subfloor for tile?

Exterior plywood is an acceptable underlayment for tile and is preferred to interior-grade plywoods because the bonding adhesives used are waterproof. If water seeps through the tile installation to the underlayment, it will not cause the wood to swell, as happens with interior-grade plywood.

Is underlayment the same as subfloor?

Underlayment is the third layer, residing just above the subfloor. While a subfloor provides structural support, the underlayment serves as a sound barrier and can protect your flooring from moisture and heat.

What are the types of subfloor?

Subflooring 101 – The 4 Main Types of Subfloor

Plywood. Plywood is probably the most common subfloor out there, and in fact, until the 1980s, was just about the only subfloor used in single family homes.
Oriented Strand Board (OSB)
Concrete Slab.
High Performance Panels.
Moisture Issues.
Subfloor Installation Management Tips.