What thickness plywood should I use for shed roof?

Roof and Floor. If you want the shed to be waterproof, its roof must be constructed just like any other roof -- a plywood decking covered with shingles or with composite or metal roofing. Most builders use 15/32 CDX for the roof; it is an exterior-grade plywood with a thickness just under 1/2 inch.
A.

What is the minimum thickness of plywood for a roof?

Most Common Thickness. For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. 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.
  • What size wood do you use for rafters?

    Use these two tables for roof rafters with a slope of 3" in 12" or less.
    Nominal SizeSpacing (o.c.)Species and Grade of Lumber ( 20# Live Load - No Finished Ceiling)
    2" x 8"1619-6
    2416-8
    2" x 10"1227-6
    1624-8
  • How thick is plywood for floors?

    the subfloors need to be thicker. For joist spacing of more than 16 inches up to 19.2 inches on center, the minimum thickness for both plywood and OSB is 3/4 inch. For joists spaced more than 19.2 inches on center, the minimum thickness for plywood is 7/8 inch and for OSB, 1 inch.
  • What is a CDX plywood?

    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, exactly. The letter stands for exposure, which means the plywood is tough enough to withstand a little moisture—but for only a short time.
B.

What type of plywood is used for roofing?

Standard Thicknesses. 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 material intended for exterior applications.
  • What is particle board made out of?

    Particle board – also known as particleboard, low-density fibreboard (LDF), and chipboard – is an engineered wood product manufactured from wood chips, sawmill shavings, or even sawdust, and a synthetic resin or other suitable binder, which is pressed and extruded.
  • Is MDF good?

    MDF consists of thin panels made from wood fiber, resin and wax. When it comes to engineered wood, MDF is often considered a level above plywood. It is denser, stronger and more durable. But as we mentioned in the beginning both solid wood and MDF have their good and bad points.
  • Is MDF wood cancerous?

    Invented in the United States, it is a compound of wood dust and scrap bonded together by a resin containing formaldehyde - a recognised carcinogen. When MDF is cut, sanded, shaped or machined in any way, it releases clouds of dust particles coated with formaldehyde.
C.

What is stronger plywood or OSB?

Wood fiber is used more efficiently in osb. Osb is stronger than plywood in shear. Shear values, through its thickness, are about 2 times greater than plywood.This is one of the reasons osb is used for webs of wooden I-joists. However, nail-holding ability controls performance in shear wall applications.
  • Is OSB cheaper than plywood?

    A simple trip to the average lumberyard or home supply store is all it takes to realize that OSB is almost always cheaper than plywood. “For a typical 2,400 square foot home, OSB will save about $700 if used as the subfloor, sheathing, and roof decking instead of plywood."
  • What is a osb3 board?

    SMARTPLY OSB3 is a strong, versatile board suitable for structural use in humid conditions (service Class 1 and 2), ideal for applications as diverse as roofing, flooring, hoarding and wall sheathing etc..
  • What is an OSB floor?

    When a roofless, partially built structure takes on water, the plywood or OSB used for floor decking can absorb water, swell, delaminate, and require sanding or replacement before finish flooring can be installed.

Updated: 21st October 2018

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