What is the best thickness for roof sheathing?

The recommended thickness for roof sheathing is ⅝” thick. Sheathing with a thickness of less than that is much more likely to result in bowing between framing which could potentially compromise your exterior roof material.

What is sheathing on a roof?

Roof decking (or roof sheathing) is the wooden boards that make up the foundation of your entire roof system. I like to say foundation because it’s what your shingles and the rest of your roofing components are installed on. Roof decking is one of the most important pieces of your roof system.

What are the different types of roof sheathing?

Types of Roof Sheathing Examined

  • Planks.
  • Wood boards.
  • Plywood.
  • Compressed wood panels.
  • OSB (Oriented Strand Board Decks)

How much does roof sheathing cost?

Divide the total roof area by 32 to get the number of sheets you will need to cover the roof. A typical 4 foot by 8 foot sheet of plywood covers 32 square feet. If your roof area is 1,600 square feet, 1,600 divided by 32 will mean you need about 50 sheets to cover the roof.

Do you glue roof sheathing?

Unlike flooring, DO NOT glue roof sheathing. Drive nails flush to the panel. Panel clips may also be required depending on the sheath- ing’s span rating and the actual framing spacing. Check local building codes for requirements.

What is the best material for roof sheathing?

OSB is now the most-used sheathing and subflooring material for new roofs and roof replacements. OSB is currently selling for less than plywood by approximately $3 per sheet, meaning a savings of several hundred dollars per conventional home.

How long does roof sheathing last?

You can expect the wood roof sheathing of a home to last 100+ years. Although it should last for the life of the home, roof sheathing lifespan can be shortened by moisture penetrating it from both above and below.

What is better for roof sheathing OSB or CDX?

CDX and OSB are used for almost similar things, but because they have different features, one is better applied in some tasks and the other one on other tasks. CDX is best for sub-flooring. OSB also seems to be good for roof sheathing. But take care, it also requires that you use water-resistant coating at the edges.

Should you nail or screw roof sheathing?

The cheapest and easiest is to re-nail or, better yet, screw down the sheathing when you replace your roof covering. The other approach is applying an AFG-01 rated adhesive to enable the roof sheathing to withstand pressure to 250 pounds per square foot or greater.

Where do you put the sheathing on a roof?

The boards are spaced on centers equal to the weather exposure of the shakes or shingles, and they are lined up so the nailing falls in the center of each board. In areas where the average daily temperature in January is 25°F or less, solid sheathing is required on the lower section of the roof to support an eaves membrane.

What kind of shingles to use for roof sheathing?

If using asphalt or fiberglass shingles, postpone shingle installation as long as possible. This will provide time for roof sheathing to adjust to humidity and moisture conditions. For best appearance, use heavier weight shingles, or laminated or textured shingles.

What kind of underlayment do I need for a shake roof?

Underlayment Specifications for Wood Shingle & Shake Roofs. Wood Roof Shingles: Over solid sheathing, use minimum No. 30 felt lapped at least 3 inches horizontally and 6 inches at end laps. Over spaced sheathing, no underlayment is used except at the eaves if eaves flashing is required.

Where does wood sheathing need to be on a house?

The eaves membrane should extend into the house 24 inches past the interior face of the outside wall. Figure 2-47, wood shakes over spaced sheathing is shown below. This is required in areas of high wind or seismic activity and wherever else a solid roof diaphragm is required by code.