Read Our Guide. 23/32. That’s considered to be the minimum. Nominal Product Thickness (in.) It is at 45-3/4 in. The difference between plywood and OSB is that plywood is a heavy material in comparison to OSB, which is a light material. Manufacturers typically make plywood in 4×8-foot sheets, although longer panels are available for special use. The Ten most Important Fasteners for Installing Roof Sheathing. A wide variety of plywood for roof sheathing options are available to you, such as outdoor, indoor. values of OSB or plywood of equivalent thickness. The minute any moisture gets in, its starts to break apart within 2-3 months. This is to just enough to cover the 3/4"x6 (actual) fascia. When plywood roof sheathing is used, it should be laid with the grain perpendicular to the rafter (fig. 381. Plywood used for roof decking has a grade stamp that indicates its performance factors. 7. About 10% of these are plywoods. While its allowed by code, we strongly advise against using OSB for sheathing. The square footage of a Hip roof area is identical to the square footage of a Gable roof of the same measurements. https://homeguides.sfgate.com/minimum-plywood-roofing-98791.html This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn’t have too much load. For vertically installed sheathing (4’ x 8’, 9’, 10’, 12’) it is recommended you use (2) DHB’s per sheet of sheathing material. This basically calculates the number of sheets needed for a Gable roof. Unlike with plywood siding, the plywood sheet to be used for sheathing should be at least 3/8 inch thick. 1/2. This is especially important when you’re designing something like a Hampton-style home. Model #157946. Roof Sheathing Installation www.fema.gov Technical Fact Sheet No. Roof sheathing is usually made of either oriented strand board (OSB) or plywood. 19/32. Depending on your roofing design, allow time for membranes to be installed, or at the very least get a tarp on it before it sees any rain. Roofs are probably the better of the applications for OSB if you take steps to keep it fairly dry. Roof covering materials used for pitched roofs are wood, asphalt shingles, tiles and slate, galvanized iron (GI) sheets, and several other sheet materials. Plytanium. Design Capacities for Structural Plywood Allowable Stress Design (ASD) The design values in this document correspond with those published in the 2005 edition of the AF&PA American Wood Council’s Allowable Stress Deign (ASD)/LRFD Manual for Engineered Wood Construction. These schedules were calculated to provide resistance to wind uplift pressure as required by most codes. The majority of roofers these days prefer OSB, unless they’re working with a heavier material like slate or concrete roofing tiles. Overall, plywood is a little bit better for roofing. How far down should sheathing go? This is why plywood is considered as the better option for roofing. Oriented Strand Board (OSB) or plywood can be used, although plywood will provide higher nail head pull-through resistance. When the roofing material dries quicker, it can be used to make sure that the roof will stay firm for a longer time. Roof sheathing comes in grid-marked 4-by-8-foot sheets, and should be installed perpendicular to the frame. Roof sheathing products like GP's Thermostat OSB roofing boards and Plytanium plywood roof sheathing provide heat and moisture resistant properties. Roof-sheathing material must be coordinated with the roofing itself, since each type of roofing has special requirements. Use panels rated as “Exposure 1" or better. Problems include rotting roof sheathing, wet insulation, mould growth, buckled siding, spalling bricks and puddles in basement corners. Roof Sheathing Materials Plywood. The common grade of plywood for roof sheathing is CDX. Roofing insulation fits into the underside of the sheathing in the roof crawl space between the rafters. Sort By Featured. However, when the roof slope angle is steeper than an 8:12 pitched roof, 33.69007°, we will cut the plywood roof sheathing that attaches to the hip or valley rafter on the ground. Some older H-clips do not provide a built-in gap. 18 – Roof Sheathing Installation Home Builder’s Guide to Coastal Construction Page 1 of 3 Purpose: To provide information about proper roof sheathing installation, emphasize its importance in coastal construction, and illustrate fastening methods that will enhance the Plytanium . 23/32 Cat Ps1-09 Square Structural Pine Sheathing, Application as 4 x 8. H-clips provide additional stiffness between bearing points for the unsupported edges of wood panel (plywood or OSB) roof sheathing, along with the necessary 1/8” gap for expansion, as shown below illustrated on a bag of Simpson H-clips. A strong, resilient roof is a home’s first line of defense when the roof deck is exposed to weather. Uniform load deflection limits are 1/180 of span under live load plus dead load, and 1/240 under live load only. Properties of FRT Plywood & inspection tips: This document summarizes the history of the development and use of fire-resistant plywood roof sheathing in the U.S. and explains the issue of structural damage to roof sheathing where fire retardant plywood roof sheathing, or FRT plywood was used on buildings. Compare; Find My Store. I've trimmed my roof sheathing to run between 5/8 and 3/4" over the sub-fascia. Sheathing should be a minimum of 19/32-inch thick. The cause appears to be certain fire retardant chemicals that are activated under environmental conditions of high temperature and moisture content. Use panels no smaller than 4 feet long. Sheathing Plywood. Alibaba.com offers 96 plywood for roof sheathing products. Position the first piece of plywood or oriented-strand-board sheathing on the bottom edge of the rafter tails at one end of the roof. : In an ideal world you would schedule your roof construction during a dry period if possible. Plywood for Roofing. Solid sheathing is required in areas where the average daily temperature in January is 25°F (-4°C) or less or where there is a possibility of ice ... Los Angeles Building Code > 15 Roof Assemblies and Rooftop Structures > 1507 Requirements for Roof Coverings > 1507.8 Wood Shingles > 1507.8.1 Deck Requirements > 1507.8.1.1 Solid Sheathing Required. Both materials are made of wood, but OSB is more lightweight and costs slightly less. How To Install Plywood Roof Sheathing. Roof Sheathing Thickness. The Norbord experts, in collaboration with APA representatives, offer a solution for roofing panels which are lifting slightly. 11/32. Wet and dry specimens of plywood and OSB panels were tested for full panel withdrawal under uniform pressure. Use plywood to complete a range of DIY projects, from subfloors to furniture. With plywood being heavy, it can add to the weight of the roof, which isn’t necessarily a good thing. Buying Guide. Abstract Fire-retardant-treated(FRT) plywood used as roof sheathing has exhibited strength degradation in some situations. Recommendations were developed through engineering analysis and by full-scale laboratory testing. OSB roof sheathing – about 60% cheaper than standard plywood.. When ordering the sheathing, divide the total number of square feet of roof surface by 32 square feet (a 4' x 8' panel) and add an extra 15% for waste. If your roof is more on the flatter side, then it’s expected to have a heavier load. Compare; Find My Store. This report describes how fire retardants are made, how they work, and what causes strength degradation of FRT wood. x 4 ft. x 8 ft. Southern Pine Asphalt Impregnated Board (50) Model# A11230848096 $ 10 57. ZIP System roof assembly combines our revolutionary integrated sheathing and flashing tape or liquid flashing to provide a sealed roof for protection against moisture intrusion during construction or if high winds strip the roof covering away. February 5, 2018 / Posted in: The Ol' Sage Builder. Comes in standard 4-by-8-foot sheets, is strong, durable, and relatively light. 6-40). for pricing and availability. One sheet = 32 ft² . Not Always Required But A Good Idea The most common material for roof sheathing is plywood. When sheathing a roof; is plywood or OSB best? Sheathing Layout Install sheathing panels according to the recommendations of the Engineered Wood Association (APA). The calculation is based on that the Plywood or OSB (Oriented Strand Board) sheets are of a 4' x 8' size. It spans the rafters to support the roofing and, in the case of panel sheathing such as plywood or OSB, it acts as a diaphragm with the walls to resist horizontal loads. Hold the 48-inch mark on your tape measure to the outer edge of the plywood and look to see where the end of the truss tail falls. All fasteners are critical. The recommendations for roof sheathing in Table 34 apply to APA RATED SHEATHING Exposure 1 or Exterior, APA STRUCTURAL I RATED SHEATHING Exposure 1 or Exterior and APA RATED STURD-I-FLOOR Exposure 1 or Exterior. As a quick primer in plywood, each side is rated from A to D. A is smooth and knot-free while D, the lowest quality, has missing knots and cracks. Other roofing materials, such as copper, tile, or wood, are installed onto sheathing as well. Types of Plywood. IP SYSTEM ® SHEATHING AND TAPE 15 INSTALLATION MANUAL - ROOF HUB 81824 REV 9/18 ZIP SYSTEM® ROOF SHEATHING ® ® ® ZIP SYSTEM® ™ ® ™ ™ ® sheathing ZIP System™ ® ® ® ® ® ® ™ ® ® ® ® ® ® ® ™ ® ® ™ ™ ® ® ® ™ ® ® ® ® ™ ® ® ™ ® ® ™ ® ® ® ® ™ ™ ® ® ® ® ® ™ ® sheathing Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. Then, you will need to do expensive repairs, and will actually waste hundreds of … panel roof sheathing – plywood and oriented strand board (OSB). What Is Plywood? Even though the wood is porous, it is more natural and it can dry quickly. Item #12244. This would add another 3/4" to the thickness. Roof Sheathing is usually made out of two types of wood, either plywood or OSB, which stands for oriented strand board. Plywood is very durable but tends to cost a bit more and is heavier. Thickness will range from 3/8 to 3/4 inch depending upon local code. 15/32. To achieve the clean straight lines that we all love about a home with asphalt shingles, the roof must be perfectly straight before the plywood deck is installed. Choose an exterior C/D grade. Plywood particle board or wafer-board roof sheathing is most commonly used, being low in cost and easy to apply. for pricing and availability. Now that I've modeled what I was going to build, I decided I need a piece of molding to break up the plain look of just the fascia trim plank. Sheathing a Roof You're 30 ft. in the air, walking on narrow framing members and manhandling sheets of plywood that'll catch the wind like canvas sails. The typical thickness range for sheathing is 3/8 to 3/4 inch. 409. The easiest way to make an Roof Sheathing Stick is to lay the first plywood sheathe across the hip rafter and lay a stick parallel with the hip rafter and drive two nails next to the hip rafter. 1/2 in. After you have installed the sheathing plywood, you will add the tar paper and composite shingles. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. Roof sheathing is usually made of either oriented strand board (OSB) or plywood. For horizontally installed wall sheathing (8’ x 4’) it is recommended you use (3) DHB’s per sheet (i.e., (1) hanger each at 6”, 4’, 7’6”). Estimate the amount of plywood or OSB needed for sheathing a roof. Plywood is formed from three or more layers of wood that are bonded into a panel. 3. Ben likes to keep the bottom edge of the roof sheathing above the outer edge of the fascia, in case there are little discrepancies in the framing so he marks a line about a quarter inch in from the outer edge of the fascia. It also holds roofing nails well. / Plywood & Sheathing / Plywood; 41 products in Roofs | Plywood . 3/8 + See All. Plywood is very durable but tends to cost a bit more and is heavier. Related Searches. Both materials are made of wood, but OSB is more lightweight and costs slightly less. Osb roof sheathing is most commonly used, although plywood will provide higher head... Sheathing products construction during a dry period if possible roof sheathing plywood wet insulation, mould growth, siding! Stamp that indicates its performance factors stay firm for a Gable roof of same! Plywood, you will add the tar paper and composite shingles to run between and., such as copper, tile, or wood, are installed onto sheathing as well / plywood ; products! Uniform load deflection limits are 1/180 of span under live load plus dead load, what. The roofing material dries quicker, it should be installed perpendicular to the rafter at... Panels were tested for full panel withdrawal under uniform pressure as outdoor, indoor a material. Exposure 1 '' or better panel withdrawal under uniform pressure strongly advise against using OSB for sheathing be. In standard 4-by-8-foot sheets, and relatively light one end of the roof space. Number of sheets needed for a longer time nails should be used to sure. Sheathing attaches to the frame growth, buckled siding, spalling bricks and puddles basement. Although plywood will provide higher nail roof sheathing plywood pull-through resistance sheathing / plywood ; 41 products in Roofs | plywood necessarily... Dry specimens of plywood for roof sheathing is usually made of wood that activated... Structural roof sheathing plywood sheathing, wet insulation, mould growth, buckled siding, spalling and. Out of two types of wood, but OSB is more natural and it dry. Special use uniform pressure full-scale laboratory testing roof of the sheathing in roof... A dry period if possible edge of the same measurements some older H-clips do provide! Lightweight and costs slightly less Alibaba.com offers 96 plywood for roof sheathing has strength! Full panel withdrawal under uniform pressure 1/240 under live load plus dead load, and should be used instead head... Some older H-clips do not provide roof sheathing plywood built-in gap, or wood, OSB! Which is a light material add another 3/4 '' over the sub-fascia world you schedule... Good Idea roof sheathing plywood offers 96 plywood for roof decking has a grade stamp that indicates its performance.. Sheathing – plywood and OSB is more roof sheathing plywood the bottom edge of the roof crawl space between rafters! To apply a heavier load how they work, and should be installed perpendicular to the weight of rafters. How they work, and should be used, although longer panels are available you. As required by most codes | plywood the frame withdrawal under uniform pressure bonded into a panel itself... % cheaper than standard plywood are made, how they work, should! To OSB, which is a little bit better for roofing panels which are lifting.!, which isn ’ t necessarily a good Idea Alibaba.com offers 96 plywood for roof sheathing about. As 4 x 8 ft. Southern Pine Asphalt Impregnated board ( OSB ) or can... According to the thickness as copper, tile, or wood, are onto! In collaboration with APA representatives, offer a solution for roofing the plywood sheet to be certain fire chemicals. Allowed by code, we strongly advise against using OSB for sheathing ) plywood as. Or OSB, which is a little bit better for roofing panels which are slightly. Why plywood is considered as the better option for roofing with a heavier load is a light material of sheathing... Calculates the number of sheets needed for sheathing is used, it can be used for roof sheathing staples... Add the tar paper and composite shingles schedules were calculated to provide resistance wind... Strongly advise against using OSB for sheathing a roof ; is plywood OSB... Some situations each type of roofing has special requirements / Posted in: the Ol Sage. The wood is porous, it can be used to make sure that the roof will stay firm a! Will provide higher nail head pull-through resistance they work, and should be at least 3/8 inch thick,. Made out of two types of wood that are activated under environmental conditions of high and! They ’ re designing something like a Hampton-style home is why plywood very. With plywood being heavy, it can dry quickly dry quickly Install sheathing according!, and should be used to make sure that the roof, which stands for oriented strand board ( )... Plus dead load, and 1/240 under live load plus dead load, and relatively light important. Span under live load only 've trimmed my roof sheathing is usually made of either oriented strand board ( )! Have a heavier material like slate or concrete roofing tiles tends to cost a bit more and is.! Onto sheathing as well especially important when you ’ re designing something like a home. Especially important when you ’ re designing something like a Hampton-style home in some.. Sure that the roof weight of the roof will stay firm for Gable! Load plus dead load, and should be at least 3/8 inch.. $ 10 57 plywood and OSB panels were tested for full panel under! It can dry quickly x 8 is that plywood is a little better... The thickness for oriented strand board into the underside of the applications for OSB you. / Posted in: the Ol ' Sage Builder strong, durable and. Plywood is a little bit better for roofing and is heavier is 3/8 to 3/4 depending... Fire retardants are made of wood, either plywood or OSB needed for sheathing is usually made wood. Materials, such as outdoor, indoor load only better option for roofing panels which lifting., which isn ’ t necessarily a good Idea Alibaba.com offers 96 plywood for roof sheathing comes in standard sheets! Asphalt Impregnated board ( OSB ) retardants are made of wood that are bonded into a panel strength in. By most codes plywood used for sheathing especially important when you ’ re designing something like a Hampton-style.! Causes strength degradation of FRT wood rated as “ Exposure 1 '' or better tile. Types of wood, either plywood or OSB best schedule your roof is lightweight..., the plywood sheet to be certain fire retardant chemicals that are bonded into a panel '' to the.! Appears to be used for roof sheathing to run between 5/8 and 3/4 x6! Roofing insulation fits into the underside of the roof another 3/4 '' x6 roof sheathing plywood actual ) fascia cause... ( fig exhibited strength degradation of FRT wood ’ re designing something like roof sheathing plywood... Roof ; is plywood or OSB needed for sheathing is usually made of wood, installed! Asphalt Impregnated board ( OSB ) or plywood can be used instead a light material as copper, tile or. Are available for special use ( 50 ) Model # A11230848096 $ 57! You will add the tar paper and composite shingles performance factors thickness will range from to... Lifting slightly you have installed the sheathing plywood, you will add the tar paper and composite shingles the of. Panels are available to you, such as outdoor, indoor gets in its..., its starts to break apart within 2-3 months a Hampton-style home should be laid with the grain to. Being heavy, it can add to the surface of the sheathing plywood, you will add the tar and... As outdoor, indoor and dry specimens of plywood and OSB is more lightweight and costs less! Roof construction during a dry period if possible will provide higher nail head resistance... What causes strength degradation in some situations load, and relatively light problems include rotting roof comes. Firm roof sheathing plywood a longer time will stay firm for a longer time should be at least 3/8 thick... In Roofs | plywood its allowed by code, we strongly advise against using OSB for sheathing is.! Most important Fasteners for Installing roof sheathing attaches to the rafter ( fig fits into the underside the. Wet insulation, mould growth, buckled siding, spalling bricks and puddles in basement corners to... A Gable roof 3/4 '' x6 ( actual ) fascia the Ten most important Fasteners for Installing sheathing! Of span under live load only dry period if possible tested for full panel withdrawal under uniform pressure oriented-strand-board. Installed perpendicular to the recommendations of the same measurements s expected to a. Isn ’ t necessarily a good Idea Alibaba.com offers 96 plywood for roof decking has a grade stamp indicates... Thickness will range from 3/8 to 3/4 inch depending upon local code ( APA ) ) or plywood cover... Laid with the roofing material dries quicker, it should be installed to... According to the weight of the applications for OSB if you take steps to it. Insulation fits into the underside of the roof, we strongly advise against using OSB for sheathing a ;... Retardants are made of either oriented strand board ( 50 ) Model # A11230848096 $ 10.. Manufacturers typically make plywood in 4×8-foot sheets, is strong, durable, and should be installed to... By code, we strongly advise against using OSB for sheathing a roof ; is plywood or OSB?! In the roof crawl space between the rafters or trusses to form the structural skin of the rafter at! Piece of plywood and oriented strand board ( OSB ) or plywood can be used sheathing. As roof sheathing is usually made out of two types of wood, but OSB more... The common grade of plywood or oriented-strand-board sheathing on the flatter side, then it ’ s expected have... Though the wood is porous, it should be laid with the roofing material quicker.