X signifies the glue that bonds the veneers.
Plywood grades for roofing.
Before lumber companies began selling osb the standard choice for sheathing a roof with a 24 inch rafter spacing was 1 2 inch cdx plywood the letters cdx indicate that it is construction grade.
When it comes to choosing what kind of plywood you need for the roof it is important to understand the basic categories that you can choose from.
Cdx plywood is a construction grade type of plywood that is designed for exposure to the elements.
Its front has a c grade while its back has a d grade.
A b c and d.
This option is basically a specialized plywood grade.
A has the highest quality and is the most expensive and d is the least expensive.
For rafters spaced 20 or more inches apart 1 2 or 5 8 inch plywood is recommended.
This is a popular option because it presents homeowners with functional but affordable roof sheathing.
Occasionally you may run into a fifth grade called c plugged.
A half inch cdx plywood is often used with rafter with 24 inch spacing.
The wood is graded on each side from a to d depending on the level of imperfections a being free of all imperfections and knots and d being un sanded and considerably defected.
A b c and d.
Each sheet will have two grades such as ac.
Most construction sites will consider the use of either osb or plywood for the roof.
Plywood sheathing is ideal for residential and light plywood sheathing is ideal for residential and light construction and every piece meets the highest grading standards for strength and appearance.
It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements.
The grade refers to the quality and appearance of the plywood s face and back veneers.
B grade plywood has a mostly smooth surface and a solid foundation.
It adds proven performance and durability to new homes room additions and renovations.
What kind of plywood for the roof.
A grade plywood features a smooth sanded surface without knots.
The most common rafter spacing is 24 inches and 5 8 inch plywood is recommended for that.
If you re looking for plywood that is smooth and can be easily painted this is a great option.
A grade plywood is the highest quality and is the most expensive as most sheets will be free of flaws.
All large knots are replaced with football shaped patches which can be sanded and finished with the rest of the panel.
Another option for an almost perfect sheet of plywood is b grade.
In the united states there are four basic softwood construction plywood veneer grades you need to worry about.
It will support roof.
We carry four grades of plywood.
The first letter is the face veneer grade and the second is for the back veneer.
Cdx is the grade of plywood most commonly used for roofing.
