What do the letters mean on plywood?

The grading system for plywood is an easy puzzle to solve thanks to the simple A–D letter system used to indicate the quality of the panel. Plywood is graded per side, meaning that individual sides can be graded differently. The letters A, B, C and D typically refer to the veneer or face of the material.

What does CDX stand for in plywood?

CDX signifies class C to D exposed plywood. Manufactures make any type of plywood from several plies pressed firmly together to create a larger and stronger piece of plywood.

What is a non combustible sheathing for a building?

The extent of noncombustible sheathing to be provided may also be up for discussion. Gypsum board is considered a composite material by IBC 703.4.2. A non-combustible base material (gypsum) and facing less than 1/8″ thick with an FSI less than 50 which includes most gypsum board panels.

Can you use wood in a non combustible building?

A: Even in the noncombustible construction types (Types I and II), many nonstructural elements of the building, such as floor coverings, windows and doors, and interior finishes, can be wood. Permitted combustible building elements in noncombustible buildings are conveniently listed in Section 603 of the IBC.

Which is better for exterior wall sheathing plywood or OSB?

OSB is available in sizes up to 8 feet wide and 16 foot long. OSB panels are dense and solid throughout the product, with no soft spots. OSB does not breath or redistributed water as well as plywood. OSB is often less expensive than plywood.

What are the different types of exterior sheathing?

It provides a surface for the application of materials, like siding, and helps shield a structure from rain, snow, wind, etc. Five common structural exterior sheathing options include wood-based, gypsum, glass mat, cement board, and Barricade® Thermo-Brace®.