How thick should my roof sheathing be?
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.
How thick should plywood be for roof decking?
Most Common Thickness 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.
Is 7/16 OSB OK for roof?
OSB is the most-used sheathing material for new roofs and roof replacements. You can use 7/16-inch thick OSB sheets without support for areas where the snow load is 30 pounds per square foot because it’s durable and maintains building integrity much longer than other sizes.
What is the best sheathing for a roof?
OSB is now the most-used sheathing and subflooring material for new roofs and roof replacements.
Are H clips required for 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.
What is the difference between decking and sheathing?
As you learn more about roofing, you will hear the terms ‘roof decking’ and ‘sheathing’ used seemingly interchangeably. Roof decking and sheathing are actually just two terms for the same process. While some roofing contractors may prefer one term over the other, there is not a technical difference.
Should you use tongue and groove OSB for roof sheathing?
Tongue & Groove Boards T&G roof decking, however, looks classy and rich. In fact, T&G boards are most frequently used when the sheathing is visible from the inside such as in cathedral ceilings or in some cabin-style homes, especially if the span of the rafters is greater than 2 feet.
Should there be gaps in roof sheathing?
The 1/8″ gap is required as the panels do shrink and expand. The clips provide this spacing and give added strength to the edge connetions so roofers don’t put their feet through the OSB while carrying shingles.
How thick is the average roof?
Standard asphalt shingles add very little thickness to the roof, because a standard three-tab shingle is about 3/16-inch thick. When installed, however, the shingles overlap, doubling the thickness.
Can you put plywood over plywood on roof?
As long as the new plywood itself can span the distance and carry the roof, wind, seismic and snow loads for your region, adding new ply over old is just fine.
How thick should roof decking be?
The decking should be at least 19/32-inch thick. A normal roof decking has a thickness of between ⅜ inches to ¾ inches. However, there are several factors that you must consider while determining the perfect decking thickness for your roof.
What are the minimum requirements for a roof deck?
• Decks constructed with spaced deck boards: – Minimum 6 inch wide – Minimum 3/4-inch thick – Installed with maximum 1/4-inch spacing between boards – Holes or gaps greater than 1/4-inch must be repaired or boards replaced. All roof deck surfaces, regardless of type, should be clean, dry, and free of debris, protrusions, dust and oil prior
What are the building codes for roof decking?
The roof decking building codes usually focus on roofing materials, installation, structural performance, and weather protection. The building code assigns the construction type depending on the occupancy and size. It also establishes the least fire resistance of a roof assembly.
Can I sheath my roof without using the minimum thickness?
Probably, but the key is not to sheath using the minimum thickness. The minimum requirement for roof sheathing is ⅜” thick. There is no upper limit on how thick your roof substrate is. Thickness allowed depends on how far apart rafters or trusses are spaced and the rating of your roof decking.