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Oriented Strand Board (OSB) or plywood can be used, although plywood will provide higher nail head pull-through resistance. Use panels rated as “Exposure 1” or better. Install sheathing panels according to the recommendations of the Engineered Wood Association (APA). Use panels no smaller than 4 feet long.
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.
What materials can be used for roof sheathing?
Roof sheathing is commonly made from materials such as: Planks. Wood boards. Plywood. Compressed wood panels. OSB (Oriented Strand Board Decks).
What thickness OSB should be used for roofing?
Standard roof sheathing thickness is ½” to ⅝” thick. If you are using OSB for your roof deck, then ⅝” is the recommended thickness. For plywood, which is slightly stronger than strand board, ½” thick is appropriate. Another factor is how far apart your trusses or rafters are spaced.
Is 7/16 OSB OK for roofing?
Standard types of wood designed for roof sheathing are oriented strand board, known as OSB, and plywood, the most popular being OSB. Sheets of 7/16-inch thick, without edge support, can be used in an area where the snow load is 30 pounds per square foot.
Can plywood be used for roofing?
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.
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.
What type of plywood is used for roof sheathing?
CDX Plywood A special grade of plywood called “CDX” is a popular choice for roof sheathing. No, the “X” in CDXplywood does not stand for “exterior.” Rather, it references the kind of glue used to bond the layers of veneer together. CDX plywood can withstand temporary exposure to rain and other moisture sources.
Is sheathing the same as plywood?
Plywood sheathing (OSB or plywood) is often mistaken for plywood underlayment. They are not the same. Plywood sheathing is most often used to construct the structural sub-floor. OSB is constructed using long strips (strands) of wood that are held together with wax and adhesive.
What type of wood is used for roof sheathing?
OSB (oriented strand board) is the most common type of decking used on roofs today. It’s made up of wood chips/strips compressed together to form a flat 7/16” sheet. Plywood comes in several different thicknesses (⅜”, ½”, ⅝”, and ¾”) depending on the span of the rafters.
Do you need plywood under shingles?
Sometimes referred to as roof sheathing or a roof deck, this plywood acts as a foundation for the layers of underlay and the shingles on your roof and connects the roof to the frame of the house. Even though it isn’t visible, it is very important to the structure of your home.
How thick should sheathing be?
The U.S. Department of Energy has determined that 7/16-inch sheathing is the minimum appropriate thickness for structural wall sheathing with an exception for gable end walls, where the minimum thickness is 3/8 inch.
How thick should plywood be for a shed roof?
Plywood thicknesses for roofs start at 3/8” in areas with light load requirements on rafters at 16” centers. Thicknesses of 1/2 to 5/8 inch are common with rafters spaced at 24” centers. For heavy load rated areas, 3/4-inch-thick plywood is recommended, regardless of rafter spacing.
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.
What’s better plywood or 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.5 days ago.
How far should roof sheathing overhang rafter tails?
Measure 45-3/4 inch up the rafter from the cut end of the truss tail and draw a line along the trusses. This is the upper edge of the first row of roof sheathing, with enough overhang to allow the sub fascia and fascia to tuck neatly underneath when the time comes.
Is 3 ply or 4 ply plywood better?
So what is the difference between 3-ply and 4-ply plywood? 3-ply plywood is the standard for internal-use plywood, featuring 3 layers of wood. While 4-ply plywood is available, it is very rare, and 5-ply plywood would be a better choice if you’re looking for increased structural ability compared to a 3-ply.
What is CDX plywood used for?
CDX Plywood is used primarily by contractors to build exterior walls and roofs. CDX plywood has one side veneer grade “C” and one side veneer grade “D”. The two are bonded together with glue which can withstand a little moisture. The APA would recognize CDX Grade Plywood as C-D Exposure 1 plywood.
What is RTD plywood used for?
Exterior panels sometimes referred to as RTD sheathing, are designed to hold up to constant moisture. They are completely waterproof and are great for installing in places where you expect consistent exposure to moisture. This RTD sheathing is great for roofs and other outdoor applications.
What do roofers put on the roof before they nail the shingles down?
Start by laying roof deck protection, or shingle underlayment, over the decking (plywood/OSB). Then, install new flashing (metal flashing is often called “drip edge” along the bottom of the roof near your gutters) and starter shingles at the edges. Nail the drip edge in place using your hammer and roofing nails.
Can you roof over tongue-and-groove?
Tongue and groove roof decking, especially the one from solid wood boards, is one of the two most common choices for residential use right now. The other one is plywood. In this article, we are going to discuss roof decking with T&G style from solid wood specifically.
Is roof sheathing necessary?
Roof sheathing is important as it is a layer of wood and as mentioned above, it attaches to the trusses and joists on the roof. Then the shingles attach to the planks of wood. This keeps the water out of the home so it is a necessary part of the home.
