CDX is the most common exterior plywood grade. It comes in 3/4-, 5/8- and 1/2-inch thicknesses. Appearance stamps on plywood range from cabinet-grade (A) to construction grade (C and D). Exterior plywood carries an X stamp, which identifies it as suitable for use outdoors.
As with a school grading system, grade A represents the best, least-damaged plywood, while grade D represents the most damaged and worn pieces. Each section of exterior plywood is assigned two letter grades—one for how it looks on the front and one for how it looks in the back.
Marine Plywood and Construction Adhesive Testing – Part 1of 2
Types of plywood || Plywood types || commercial ply || BWR ply || Marine ply || plywood grades
Frequently Asked Questions
What plywood can you use outdoors?
Exterior plywood is a weather-resistant kind. Since it is meant to be used outside and exposed to every sort of weather elements, it is made stronger, and its layers are glued together using waterproof glue. It resists wind perfectly well. It is also not easily damaged by water and other weather elements.
What is exterior grade CDX plywood?
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.
What is the difference between marine grade plywood and exterior grade plywood?
Exterior plywood is about ¾'' thick and contains five plies of plywood with a fibreglass layer on its surface. Marine grade plywood has a similar thickness but comprises 9-11 plies of wood.
What's the best grade of plywood to buy?
Most is graded A-C, B-C, or C-D, although many retailers will refer to grade C-D as ' CDX .' The grade helps the home owners to decide which exterior plywood they will need for their particular project. Higher grade pieces work best for decorative projects, while lower grade plywood works best for the more utilitarian purposes.
What kind of plywood can I use on counter top?
Exterior plywood can also be used on countertops around sinks or even inside cabinets. Exterior plywood works fine for just about any interior application, except for the fact that it has numerous defects or patches in the surface. The majority of all exterior plywood is made from fir.