Can you use exterior plywood for subfloor?

Today, a much better option is a plywood specifically designed as underlayment and made with sustainably forested wood. You can also use AC exterior-grade plywood, which has one smooth face and one rougher face. Always install underlayment with the smoother face up.

Can exterior plywood be used for flooring?

Both marine and exterior plywood make excellent subfloor material. Their water-resistant properties prevent moisture from passing through the subfloor and reaching the floor's surface. Marine-grade plywood can withstand extreme conditions.

Can I use any plywood for subfloor?

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.


Can sheathing plywood be used for subfloor?

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.

Is plywood subfloor exterior grade?

Exterior Grade Softwood Plywood is most commonly used in the construction industry for its structural qualities and price point. It is usually made from softwoods such as Douglas Fir or Pine. A structural exterior (water resistant) adhesive is used to adhere the veneer layers together.


Which is better, OSB or Plywood?



Can you use CDX plywood for subfloor?

Although considered an exterior plywood, CDX is often utilized as the subfloor for kitchens and bathrooms— especially for floors destined to be finished with ceramic tiles.

Is it better to use OSB or plywood for subfloor?

OSB has a lower resale value than plywood due to its lower strength. For this reason, few homeowners prefer OSB in their homes. Apart from costs, plywood is superior in all the other areas, such as the strength of the structure. For this reason, it's a superior material for use on the subfloor.

What thickness of plywood is used for subfloor?

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. There are several factors that determine what subfloor thickness is optimal for added benefits like insulation.

What is the best subfloor material?

Plywood. 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 cheapest subfloor?

Rarely, a prospective homeowner may recognize that OSB is the cheaper subfloor material.

Do you need two layers of subfloor?

The subfloor has to be attached to the joists, and two subfloor layers glued together or just nailed through to the joists, is no different than one thicker subfloor layer.

What is the best plywood to use for flooring?

Interior plywood is ideal for rooms not exposed to moisture, such as bedrooms, and makes a good subfloor for carpeting, tiles, vinyl, engineered wood laminate flooring and hardwood flooring. Exterior plywood is a better choice for bathrooms, kitchens and any other rooms exposed to water and moisture.

Can exterior plywood be used indoors?

Bathrooms and laundry rooms are common room in which you can use borate plywood. It can also be used for exterior sheathing. Yellow pine and Douglas fir are the types of wood treated with borate.


Is exterior plywood pressure treated?

Other types of exterior plywood include: pressure treated plywood, overlaid plywood, oriented strand board (OSB), and T1-11. Pressure treated plywood is regular plywood infused with chemicals that add to its resistance against mold and mildew.

Can Marine ply be used as flooring?

Marine plywood is a great sheet material that can be easily cut using both hand saws and basic power tools. Marine plywood is often used to build boat interiors and to replace flooring during boat renovations.

How do you waterproof a subfloor?

To waterproof the plywood yourself, first repair it if needed and then sand it down and clean it off. Use a waterproof sealant, stain or paint and apply two to three layers. Allow each coat to dry thoroughly before painting the next one.

Is Zip sheathing a vapor barrier?

Are ZIP System sheathing panels a vapor barrier? No, the integrated protective overlay of a ZIP System wall sheathing panel is permeable to allow for drying to the outside.


Who manufactures AdvanTech flooring?

Huber Engineered Woods LLC creates innovative specialty products—AdvanTech® subflooring and subfloor adhesive and ZIP System® roof and wall sheathing—that provide residential and commercial builders with improved performance, easy installation and overall peace of mind.

Do you nail or screw subfloor?

Ideally, nail down your subfloor using corrosion-resistant nails that will securely hold it in place and last a long time. Screws are a great alternative that you can easily remove, but they are not as sturdy. Screws are superior in terms of reducing floor squeaks, but the installation is slower.

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

If you are using plywood for your subfloor, you should use a minimum of one layer that is between ¾” and ⅝” thick. This thickness will suffice for most floors; however, codes will vary and a second layer is a good idea if your floor covering is going to be a heavy material like ceramic tiles or natural stone.

How thick should plywood be to walk on?

The thinner plywood is acceptable when the joist spacing is 16 inches. If you plan to finish the floor in the attic and turn the room into a living space, however, you should always use 3/4-inch plywood. Thinner plywood can flex when you walk on it -- even with 16-inch spacing -- and this will damage the flooring.


What type of plywood is used for underlayment?

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.

Can I use 7/16 OSB for subfloor?

Oriented strand board, or OSB, is a wood structural panel that can also be used for flooring. It is made from shredded strands of wood pressed together with wax and a special adhesive, then hot pressed into a panel with up to 50 layers of strands. OSB can be used for subfloors, although it is not as common as CDX.

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.
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