What is CDX plywood used for?

CDX Plywood is used primarily by contractors to build exterior walls and roofs. CDX plywood has one side veneer grade “C” and one side veneer grade “D”. The two are bonded together with glue which can withstand a little moisture. The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood.

Is CDX plywood rated for outdoor use?

CDX plywood, a stock item at most lumberyards, is a utility grade suitable for most outdoor projects.

Is CDX plywood waterproof?

Keep in mind that this kind of plywood is water resistant, not waterproof, and can still be ruined from a leaking tub or toilet. CDX plywood is often used under shingles and roofing felt, on walls (just behind the siding and insulation), and as a sub floor just under the carpet pad or a tiled floor's durock.


Is OSB or CDX better?

Although some people will ultimately choose CDX, many experts argue that OSB is better overall for roofing. OSB is far less likely to expand and contract when exposed to humidity and moisture, even though it will take longer to dry. With wrapping, though, it can withstand the elements without issue.

What is the difference between CDX and plywood?

The less the number of knots, holes and repaired defects the more expensive the plywood. If so, it therefore, means CDX has the most number of knots and defects, making it a lower grade plywood. C in CDX means one side of the plywood is of grade C, and the other is of grade D.


What Is The True Difference Between Oriented Strandboard and CDX Plywood?



Is CDX used for roofing?

CDX Plywood

A special grade of plywood called “CDX” is a popular choice for roof sheathing. No, the “X” in CDXplywood does not stand for “exterior.” Rather, it references the kind of glue used to bond the layers of veneer together. CDX plywood can withstand temporary exposure to rain and other moisture sources.

Can I use CDX 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.

What plywood is best for outdoor use?

What Type of Plywood is Best For Outdoor Use?
  • 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. ...
  • There are many types of exterior plywood to choose from — the most common being CDX or ACX.


What CDX means?

The letter “X” in CDX refers to the type of glue used in the factory to bond the plywood veneers. Some mistakenly think the “X” stands for “exterior”—which is not true. The letter “X” stands for exposure, which means the plywood is tough enough to withstand a little moisture—but for only a short time.


What does CDX stand for in CDX plywood?

What is CDX? CDX is veneer plywood, which is manufactured by gluing and pressing together sheets of wood. The letters C and D represent the grades of either side of the plywood, while X stands for exposure.

Can you use CDX plywood inside?

CDX plywood is classified as an "exposure" type of sheathing rather than an "exterior." This means that CDX plywood should only be used inside or on surfaces that will not be exposed to water once the building process is complete.

Is CDX moisture resistant?

CDX plywood is exposed when it is used, which means that while it is water-resistant, it is not waterproof, and therefore it can only withstand a limited amount of moisture over a short period of time before it starts to degrade.

Can you paint CDX plywood?

Lightly sand between coats with 120-grit sandpaper to provide a bonding surface for subsequent coats. Flip the plywood and repeat on the opposite side. Spray on three coats of oil-based paint with an electric paint sprayer. Allow one hour drying time between coats.


How long will CDX plywood last outside?

Usually, the life expectancy is up to 30 years, or sometimes even more, depending on the way of installation.

Which is the best waterproof plywood?

Bond 710 is a premium Boiling Water Proof Marine Grade plywood and it is completely waterproof in nature. These plywood sheets are It is also borer and termite proof and comes with a 15 year warranty. Bond 710 is a premium Boiling Water Proof Marine Grade plywood and it is completely waterproof in nature.

Is CDX plywood fire rated?

CDX 5-Ply Interior Fire-Rated Fir Pressure-Treated Plywood 97874.

Does painting plywood make it waterproof?

Method 1: Waterproofing Plywood With Paint

Painting plywood is a quick and easy way to waterproof it. If your plywood will be going outdoors, exterior latex paint is the better option, while indoor projects are well-suited to interior latex paint.


What are the 5 grades of plywood?

Typical plywood grades and characteristics
  • “A” Grade. Sanded smooth, paintable. ...
  • “B” Grade. Solid surface with some repairs, usually football-shaped patches and/or wood filler. ...
  • “C” Grade. Tight knots to 1-1/2 in. ...
  • “D” Grade. Knots and knotholes up to 2-1/2 in.


How do you waterproof plywood outdoors?

To use plywood outdoors, seal it by applying multiple thin layers of polyurethane varnish, epoxy sealant, spray-on latex, waterproof paint, or drying oils like Thompson's WaterSeal.

What is the best plywood to use for subfloor?

Standard plywood can be used for subfloors, but a better material is 3/4-inch tongue-and-groove plywood subflooring. The tongue-and-groove edges interlock to resist movement along the panel edges and create an overall stiffer floor.

What is the best plywood to use for flooring?

When choosing a grade for your plywood flooring I'd stick with CDX if it's a subfloor. Higher grade plywood is typically used for cabinet and furniture making. If your joists are spaced at 16 inch on center go with at least a 5/8 inch plywood. Use two layers of plywood when building a fiberglass floor.


What is the best wood for 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 best plywood to use for roofing?

What is the Best Plywood for Roofing? 5/8-inch plywood is the most common choice for roofing with 24-inch rafter spacing. It's also the standard for most roof applications because it supports roof loads in most situations. However, heavier roof loads may require 3/4-in CDX plywood for roof sheathing.

What is the best sheathing for a roof?

OSB is the better option for roof sheathing. It's water-resistant and costs much less than other options.

What is the standard plywood for roofing?

Most Common Thickness

The most common rafter spacing is 24 inches, and 5/8-inch plywood is recommended for that. It will support roof loads for most situations and is the standard for most roof applications. Roofs with very heavy loads may require 3/4-inch thickness.
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