Is OSB or plywood better for roof sheathing?

Is OSB or plywood better for roof sheathing?

Plywood Holds the Moisture Advantage Over OSB When plywood gets wet, it tends to swell. OSB takes longer than plywood to get saturated, but also takes much longer to dry out. When used as roof sheathing, this tendency to hold moisture means it will degrade faster than plywood when exposed to chronic leaks.

What roof sheathing is best?

Common Types of Roof Sheathing

• Plywood. This sheathing option is considered one of the strongest and more durable options.
• Oriented strand board (OSB) OSB is made of many layers of wood pressed together to create a compact 4×8 board, much like plywood.
• Step sheathing.

Can you shingle over wet plywood?

Do not shingle over wet or damp roof sheathing or damp felt paper. The trapped moisture cannot evaporate when the sun heats the shingle. Use similar roof sheathing materials — i.e., plywood or three-quarter-inch lumber — to repair holes that might be discovered in the original sheathing when the shingles are removed.

What is the standard thickness of roof sheathing?

about 7/16-inch
The typical thickness of roof sheathing is about 7/16-inch, which is just under 1/2-inch.

Should I Resheet my roof?

Your New Roof The most efficient and cost effective option is to resheet directly over the shiplap with exterior grade plywood. This is acceptable by code, as well as the roofing manufacturers. And when you need a new roof, you need it to be installed correctly.

How thick should roof plywood be?

3/8 inch
Most roofs will be sheathed in plywood at least 3/8 inch thick. That will suffice on a roof with rafters set 16 inches apart with minimal roof loads. Loads will vary with the pitch of the roof; the flatter the roof, the greater the load on any one section. Steeper roofs will have lighter loads per square foot.

Do you need H clips roof sheathing?

H-clips are referred to in the APA Guide as “edge support.” For the most common roof sheathing in our area, which is 1/2” nominal (7/16” actual) sheathing over trusses or rafters at 24” on center, there is no requirement for H-clips. One or two H-clips will often allow a longer span between roof trusses/rafters.

Are H clips required for roof sheathing?

What are some common problems with roof sheathing?

Common issues associated with damaged roof sheathing include:

• Unusually high heating and cooling costs.
• Premature wear on the shingles.
• Water leaks.
• Mold in your attic.
• Rotting roof trusses.
• Water stains on your ceilings and walls.
• Insect infestations.