Exterior grade plywood is more water resistant than strand board based on my observations exposed edges or leaks cause more damage to OSB than to plywood. The thickness of plywood used for roof decking depends on the roof slope the spacing of.
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OSB and plywood share many similarities as far as structural performance.
What plywood should i use for roofing. Plywood is made with three or more layers of thin wood glued together with the grain. This thickness will ensure that the wood is sturdy enough to hold the screws in place and support the metal roofing. It costs less than plywood and provides the same resistance and stability.
It can withstand moisture for a brief period of time but may become warped and delaminated with consistent exposure to the elements. Sep 27 2020 Be sure to use plywood that is thick enough. 5-ply is a versatile type of plywood that is about 4-millimeters thick.
The sole exception to this is pressure treated CDX which can survive for. Jul 08 2016 Plywood is typically used for sheathing because its water resistant provides great structural stability and is low cost. CDX plywood is a construction-grade type of plywood that is designed for exposure to the elements.
Do not use CDX for roofing sheds or other places that are exposed to moisture consistently. Most construction sites will consider the use of either OSB or plywood for the roof. However oriented strand board is another favorite.
Aug 24 2018 Exterior grade plywood and OSB are the two main choices for roofing. The plywood or OSB you use for a base underneath your metal roofing should be at least 716 inch thick. If you mix thicknesses of plywood it will cause a problem eventually and the thicker sheathing will be noticeable probably within a month.
3-ply is one of the most common types of plywood. If you think of the way that plywood is manufactured every 18 thickness is a different layer that is rotated 90 degrees which is what gives plywood its bi-directional strength and dimensional stability. Aug 30 2016 Incase the roof need to be repair after 10 years maybe PT plywood would still be in good condition to use instead of replacing water demaged plywood.
While strand board is stronger in shear force plywood of the same thickness is lighter easier to lift on your own. Foot and with a maximum of spacing of 16 inches between rafters. Use it indoors or outdoors but avoid using for.
There are two types of plywood used in roofing construction structural and general plywood. Aug 23 2020 Generally you can use both plywood and OSB for different uses. They work equally well and hold still to wherever you attach them.
If your roof carries a heavier load like if theres less pitch andor it snows in your area a roofer may recommend the use of the. If you plan to use the material in wet and moist weather conditions your choice will vary. International Association of Home Inspectors.
Only use CDX plywood for the interior of a house where water damage is far less likely. With 58 plywood you. Comment below to have your question answered on a future episode.
It might be a over kill by some options but it might be a cheaper way if you consider cost of tear down the plywood 10 years later. Softwood plywood can also create things like sheds temporary flooring doghouses shelving and more. What do you need to know when deciding between OSB and plywood for your roof deck.
Multi-ply is a catchall term for plywood with seven or. Dec 06 2018 OSB and plywood come in thicknesses ranging from 516 to 34 inch and the thickness needed for a particular roof depends on several factors including rafter spacing expected load and roof. Should be replaced optimally but it would be better to use all the same thickness sheathing than to mix them.
The ideal thickness for the standard rafter spacing of 24 inches is 58 th of an inch. The minimum thickness of plywood used for roofing is 38 th of an inch. Jul 16 2019 Pine plywood Although the name implies that these woods arent as strong as others you might be surprised to know that construction workers typically use softwoods for exterior frame sheathing roof sheathing and sub-flooring.
Many Factors Affect Thickness. Steeper rather than flatter roofs will have lesser load per sq. Dec 06 2018 The Minimum Plywood for Roofing Plywood Is Layers of Wood.
Unfortunately an OSB is less resistant to water compared to plywood. And this will reduce the life of the shingles tar paper and roof. This kind of plywood can be used on roofs with minimal load.
I never use anything less than 58 plywood for exterior roof sheathing. Structural plywood has proof of strength performance provided by the supplier and indicates it has passed the building regulations to be used for structural use in a building. A half inch CDX plywood is often used with rafter with 24-inch spacing.
It is about 2- to 3-millimeters thick and is generally used indoors.
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