My typical detail is I+WS directly against the sheathing and over the top edge of the fascia, and a full coverage of underlayment membrane (with dripedge between the two for asphalt or wood roofing) but there are various ways to do it. The IBC code further states in Section 1609.5.1 Roof deck, that the deck must be designed and installed in accordance with ASCE 7. THICKNESS (INCHES) GAGE WEIGHT (lbs per sq ft) Copper 0.024 1 (16 oz) Aluminum 0.024 Stainless steel 28 Galvanized steel 0.0179 26 (zinc coated G90) 26 (zinc coated ... 4 inch (19 mm) into the roof sheathing. Wood structural panel roof sheathing in accordance with Table R503.2.1.1(1) shall not cantilever more than 9 inches (229 mm) beyond the gable endwall unless supported by gable overhang framing. Thank you for your responses. Common roofing term explained by Total Roofing of Ft Worth: Sheathing. I am zone 6/7. I don't know about the separation issue. MINIMUM THICKNESS OF LUMBER ROOF SHEATHING A lot of it depends on the live load where you are, which includes wind and snow loads. The allowable unit stresses for fire-retardant-treated plywood, including fastener values, shall be developed from an approved method of investigation that considers the effects of anticipated temperature and humidity to which the fire- retardant-treated plywood will be subjected, the type of treatment and redrying process. Plastic sheets. The fire-retardant-treated plywood shall be graded by an approved agency. You also need a high-temp membrane at the eaves, at least; Protectowrap Jiffy HT and Grace Ultra HT are the two I see most often. An unvented roof assembly is possible only if you keep the roof sheathing warm enough to prevent conditioned air from condensing against it. It sucks to watch Ice + Water Shield melt down a fascia. This feature has been temporarily disabled during the beta site preview. But I've always worked in windy environments; it may not be as necessary where you are. Specifier: Select option in "Thickness" paragraph below and corresponding option in "Thermal Resistivity" paragraph that follow. Basic Wind Speed in Louisiana ranges from 90 mph in the northern part of the state to 150 mph in the southeastern tip. The International Residential Code (IRC) and the Residential Edition of the Florida Building Code (FBC) both refer to Table R503.2.1.1(1) of the APA Engineered Wood Construction Guide for specs. Never attach roof sheathing with staples; 8d ring-shank nails should be used instead. For SI: 1 inch = 25.4 mm. Not enough XPS over roof - should I vent? The maximum allowable spans for wood structural panel roof sheathing shall not exceed the values set forth in Table R503.2.1.1(1). The thickness of the deck shall be 7/16 of an inch to 5/8 of an inch thick and fastened using 8d common nails, 10d box or power-driven nails. Malcolm, I almost always use 5/8" ZIP sheathing on roofs, and metal roofing installers have never questioned it. It is a layer of boards that is applied to the joists and studs to strengthen them and to serve as a … Roof sheathing is noncombustible materials or approved fire-retardant-treated wood for a distance of 4 feet on each side of the wall or walls, or one layer of 5 /8 -inch Type X gypsum board is installed directly beneath the roof spacing in inches for roof sheathing. I've never used commodity OSB on a roof but it's probably fine in 5/8" thickness, and possibly in 1/2" thickness. It is more than required by code but provides a nice stiff surface. R803.2.2 Allowable spans. For rafters spaced 20 or more inches apart, 1/2- or 5/8-inch plywood is recommended. I've always used either 1/2" or 5/8" plywood. R803.2.3 Installation. The bigger issue, in my opinion, is making sure the appropriate roofing underlayments are used. Code requires it at the eaves (projecting 24" from the exterior wall in plan view) but I also like to use it at transitions from roofs to cheek walls, around chimneys, and in narrower strips along rakes. Wood structural panel roof sheathing exposed to the underside may be of interior type bonded with exterior glue, identified as Exposure 1. I R803.2.3 Installation. R803.2.1.2 Fire-retardant-treated plywood. Also covers wood panel (plywood, OSB) roof sheathing requirements.) I use 1/2 under standing seam with no problems, we get maybe 60" of snow a year average. Roof coverings. Section R802 Wood Roof Framing. R803.2.3 Installation. Allowable spans for lumber used as roof sheathing shall conform to Table R803.1. whether or not the sheathing has clips. If you use edge clips (or tongue-and-groove material, though I've never seen that on a roof) you can use a thinner sheathing. After research I believe that you have to … Wood structural panel roof sheathing exposed to the   underside may be of interior type bonded with exterior glue, identified as Exposure 1. 2. The maximum allowable spans for wood structural panel roof sheathing shall not exceed the values set forth in Table R503.2.1.1(l), or APA E30. (In the "Lessons that only need to be learned once" category. The allowable unit stresses for fire-retardant-treated plywood, including fastener values, shall be developed from an approved method of investigation that considers the effects of anticipated temperature and humidity to which the fire-retardant-treated plywood will be subjected, the type of treatment and redrying process. Table R502.3.2.1.1(1) in the IRC provides guidance on roof sheathing: https://codes.iccsafe.org/public/document/IRC2015/chapter-5-floors, and manufacturers' literature has more information. Roof sheathing can be nailed or stapled. Wood structural panels shall conform to DOC PS 1, DOC PS 2 or, when manufactured in Canada, CSA O437 or CSA O325, and shall be identified for grade, bond classification, and Performance Category by a grade mark or certificate of inspection issued by an approved agency. R803.2.1.1 Exposure durability. Allowable spans for lumber used as roof sheathing shall conform to Table R803.1. Wind extractors. Wood structural panels shall conform to DOC PS 1, DOC PS 2, CSA O437 or CSA O325, and shall be identified for grade, bond classification and performance category by a grade mark or certificate of inspection issued by an approved agency. 1. The allowable unit stresses for fire-retardant-treated plywood, including fastener values, shall be developed from an approved method of investigation that considers the effects of anticipated temperature and humidity to which the fire-retardant- treated plywood will be subjected, the type of treatment and redrying process. For this exam it is the International Residential Code (IRC). Allowable spans for lumber used as roof sheathing shall conform to Table R803.1. Thickness is total thickness of ZIP System sheathing layer and foam insulation layer. ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. IRC Table R803.1 specifies the minimum thickness for wood board roof sheathing for various spacings between roof rafters, trusses, or … Speaking of underlayments, what do you, and others, recommend between OSB and standing seam metal in zone 6? The death of the 8’ sheet… One of the biggest items when sheathing a wall vertically is that the sheathing has to be continuous (602.10.4 &.5) which meant that an 8’ sheet wouldn’t cut it in many places so longer ones were required. Warmer climates require less foam. https://codes.iccsafe.org/public/document/IRC2015/chapter-5-floors, Misleading Energy Reports Used to Sell Spray Foam. or Less Roof Fastening Zone Wind Main Sheathing-to-Gable- Overhang Velocity Roof End-Wall Framingg (eaves) (3-Second Panel 123 2 3 2 3 R803.2.1.2 Fire-retardant-treated plywood. The fire-retardant- treated plywood shall be graded by an approved agency. Tony, my favorites are Siga Majvest or Pro Clima Mento 1000, but there are many to choose from. I've always been one who likes to know the WHY behind the answers to questions but I know it requires more time on your part. R803.2.2 Allowable spans. Is 1/2" osb okay for a standing seam roof ( and other roofing materials ) or is 5/8" preferred? * R905.2.1 Sheathing requirements The allowable unit stresses for fire-retardant-treated plywood, including fastener values, shall be developed from an approved method of investigation that considers the effects of anticipated temperature and humidity to which the fire-retardant-treated plywood will be subjected, the type of treatment and redrying process. MINIMUM THICKNESS OF LUMBER ROOF SHEATHING. Wood structural panel used as roof sheathing shall be installed with joints staggered or not staggered in accordance with Table R602.3(1), APA E30 for wood roof framing or with Table R804.3 for cold-formed steel roof framing. Wood structural panel used as roof sheathing shall be installed with joints staggered or not staggered in accordance with Table R602.3(1), or APA E30 for wood roof framing or with Table R804.3 for steel roof framing. You must be a magazine subscriber to access this feature. The map at right, which is based on table R806.4 of the IRC, lists the minimum R-values required to prevent … R803.1 Lumber sheathing. roofs. Am I correct and is this true even in northern Michigan? ICC Digital Codes is the largest provider of model codes, custom codes and standards used worldwide to construct safe, sustainable, affordable and resilient structures. For example, a code user cannot enter the table with a live roof load of 60 psf, with roof truss spacing of 24”o.c. Wood structural panels shall conform to DOC PS 1, DOC PS 2 or, when manufactured in Canada, CSA 0437, and shall be identified by a grade mark or certificate of inspection issued by an approved agency. Everyone including myself in my metro and sorrounding will typically use 1/2", I have come across 3/8" plywood on homes from the 80's. and 24" o.c. Thickness: [1 inch (25 mm)] [1-1/2 inch (38 mm)]. The fire-retardant-treated plywood shall be graded by an approved agency. ... Sheathing less than ½” thickness placed over rafters which are spaced more than 20” on center require ... inch air space shall be provided between the insulation and roof sheathing and at the location of the vent. The cabin is just 440 sf and is in zone 6. Thank you very much for your time and patience. Wood structural panels shall comply with the grades specified in Table R503.2.1.1(1). Section R801 General. © 2021 The Taunton Press, Inc. All rights reserved. R803.2.1 Identification and grade. Spaced lumber sheathing is not allowed in Seismic Design Category D2. In Zone 6 the IRC prescribes a minimum of R7.5 on 2x4 framing (with a presumptive R13 cavity fill), R11.25 on 2x6 framing (with presumptive R20 cavity fill). All wood structural panels, when designed to be permanently exposed in out- door applications, shall be of an exterior exposure durability. Spaced lumber sheathing is not allowed in Seismic Design Category D2. The second number is the maximum o.c. Your advice and explanations are invaluable to me and to many other readers! Flashings. If it was originally secured using staples or 6D nails, it must be completely re-nailed to the new standard. Additional 3 nails or staples into the sub … ), Michael, My cabin trusses will be 24″ oc and I will use either 1/2″ or 5/8″ osb sheathing and a standing seam metal roof. Engineers (ASCE) as a reference for the International Residential Code (IRC), on which the Louisiana State Uniform Construction Code is based. Spaced lumber sheathing for wood shingle and shake roofing shall conform to the requirements of Sections R905.7 and R905.8. In accordance with 2015 IRC Section R908.3, all existing layers of roof coverings must be removed down to the sheathing before reroofing. Wood structural panel used as roof sheathing shall be installed with joints staggered or not staggered in accordance with Table R602.3(1), or APA E30 for wood roof framing or with Table R804.3 for steel roof framing. Titanium UDL and Rooftopguard are two others I often spec. Wood structural panel used as roof sheathing shall be installed with joints staggered or not staggered in accordance with Table R602.3(1), APA E30 for wood roof framing or with Table R804.3 for cold-formed steel roof framing. R803.2.1 Identification and grade. e. R803.2.2 Allowable spans. This Inspection Checklist reflects code requirements of the 2015 International Residential Code (IRC). There has been substantial debate over the minimum acceptable thickness of plywood when used as roof sheathing. Note: Basement walls require a minimum of either R-10 continuous or R-13 batted insulation. Section R803 Roof Sheathing. 133. Wood structural panels shall comply with the grades specified in Table R503.2.1.1(1). 6.5 ROOF SHEATHING Wood boards installed either perpendicular or at an angle to the rafters (or trusses) or wood structural panels can be used as roof sheathing. The eaves flashing should extend up the roof to a point 24 inches inside the building. Can someone direct me to blogs or Q&A titles that address roof sheathing thickness? Installation details shall conform to Sections 2304.7.1 and 2304.7.2 for floor and roof sheathing, respectively. and select appropriate roof sheathing for that application. 75. Some roofers or manufacturers don't like to install over skip sheathing, but I've never had a problem with it locally. R803.2.3 Installation. Spaced lum- ber sheathing for wood shingle and shake roofing shall con- form to the requirements of Sections R905.7 and R905.8. Roof Sheathing Panel Spacing Hints: Use a 10d box (0.128-inch-by-3-inch) nail as a spacer to gauge 1/8-inch edge and end spacing between panels. R803.2.1.2 Fire-retardant-treated plywood. Michael and all other responding advisers. Roof sheetings. All wood structural panels, when designed to be permanently exposed in outdoor applications, shall be of an exterior exposure durability. 1. Roof sheathing serves as a protective covering for the rafters and other inner roofing components. Any thoughts on OSB vs plywood under metal roofs? Wood structural panel roof sheathing exposed to the underside shall be permitted to be of interior type bonded with exterior glue, identified as Exposure 1. Wood structural panels shall comply with the grades specified in Table R503.2.1.1(1). Wood structural panel used as roof sheathing shall be installed with joints staggered or non- staggered in accordance with Table R602.3(1), or APA E30 for wood roof framing or with Table R804.3 for steel roof framing. So companies like Norbord started creating “TallWall” & … R803.2.3 Installation. Impregnated foam seal for mass housing projects and roof closures. This won't delete the articles you've saved, just the list. Nail or staple sheets at 6" centers for middle rows and 3" centers for the edge rows. My cabin trusses will be 24" oc and I will use either 1/2" or 5/8" osb sheathing and a standing seam metal roof. Spaced lum- ber sheathing for wood shingle and shake roofing shall con- form to the requirements of Sections R905.7 and R905.8. Tony, builders sometimes denigrate the building code, and it's not perfect, but a lot of smart people have spent a lot of time developing prescriptive recommendations for almost all of the typical construction situations. R803.2 Wood Structural Panel Sheathing (Roof Online Note: This subsection covers plywood and OSB sheathing. R803.2.3 Installation. I have inferred from your answers that metal roofing is hot and will melt regular ice & water shield. Yes, metal roofing gets very hot in all climate zones, and can melt regular I+WS. Tony. The R9.6 ZIP-R may underperform the R7.5 during Polar Vortex disturbance cold snaps, and the R12.6 will likely underperform the R11.25 in the cooler weeks of even normal winter weather. Allowable spans for lumber used as roof sheathing shall conform to Table R803.1. Typically if Im in northern WI zone 7 5/8 is the norm regardless of roofing type for the heavier snow load. 1. 2%. Spaced lumber sheathing is not allowed in Seismic Design Category D2, ——————————————————. No work experience is required to take the exam and you must be at least 18 years of age. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Roof covering. H-clips are referred to in the APA Guide as “edge support." R803.1 Lumber sheathing. I would strongly recommend talking to your roofer about their requirements before settling on your other roof details. My state uses the 2015 IRC. Typical deck construction consists of Wolmanized structural plywood or CDX. Roof will be fully vented. There has been a lot of mis-quoting of the wrong section of the code. Spaced lumber sheathing is not allowed in Seismic Design Category D2. It greatly increases my understanding of whole systems. Wood structural panel roof sheathing exposed to the underside may be of interior type bonded with exterior glue, identified as Exposure 1. Sheathing should be a minimum of 19/32-inch thick. R803.2 Wood structural panel sheathing. I don't see why you would need a separate isolation membrane between the roofing and the membrane, but there may be a reason. I have also inferred (still without a why) that, unlike asphalt shingles, metal roofing needs to be isolated from the ice & water membrane which I assume (but do not know) is due to different expansion/contraction rates and also to prevent the metal from sticking to the membrane. ———————————————. The only exception is when there is only a single layer of existing roof covering and the roof covering and sheathing below is an adequate base that is neither deteriorated and not water soaked. live and total loads; OSB/plywood is allowed to span 60" maximum with clips (7/8” thick sheathing) and 48” maximum without clips (7/8” thick sheathing). TABLE R803.1. Wood structural panels shall conform to DOC PS 1, DOC PS 2 or, when manufactured in Canada, CSA 0437, and shall be identified by grade mark or certificate of inspection issued by an approved agency. Roof will be fully vented. The fire-retardant-treated plywood shall be graded by an approved agency. Step 4: Cover sheathing with shingle underlayment felt to minimize roof sheathing exposure to weather, unless otherwise recommended by sheathing manufacturer. R803.1 Lumber sheathing. Wood structural panels shall comply with the grades specified in Table R503.2.1.1 (l). Wood structural panels shall conform to DOC PS 1, DOC PS 2 or, when manufactured in Canada, CSA O437 or CSA O325, and shall be identified for grade, bond classification, and Performance Category by a grade mark or certificate of inspection issued by an approved agency. ; Floor or roof sheathing conforming with this table shall be deemed to meet the design criteria of Section 2304.7. In my zone 6 location with a 50 psf snow load, I use 5/8" sheathing on both 16" o.c. Fasteners for asphalt shingles shall be galvanized steel, stainless steel, aluminum or copper roofing nails, minimum 12 gage [0.105 inch (3 mm)] shank with a minimum 3 / 8-inch-diameter (10 mm) head, ASTM F 1667, of a length to penetrate through the roofing materials and a minimum of 3 / 4 inch (19 mm) into the roof sheathing. Spacer-type panel edge clips are available from some manufacturers. CDX works fine in 1/2" or 5/8" thickness. The code edition of the reference used should reflect the code edition of the exam you are taking. See Table R503.2.1.1 for minimum allowable panel thickness by span and load.) ZIP System Roof and Wall Sheathing is used as a combination roof sheathing and roof underlayment. And when you say "...at the eaves, at least", are you referring to code requirements for ice dam protection? Colder climates need a thicker layer. Wood structural panels, when designed to be permanently exposed in outdoor applications, shall be of an exterior exposure durability. R803.2.1.1 Exposure durability. The maximum allowable spans for wood structural panel roof sheathing shall not exceed the values set forth in Table R503.2.1.1(1), or APA E30. 61. To prevent wet sheathing, the IRC requires builders to use Table R806.5 to determine the foam thickness to prevent condensation. R803.2.1 Identification and grade. Roof sheathing comes in grid-marked 4-by-8-foot sheets, and should be installed perpendicular to the frame. IRC 2009 (and 2006) Table R503.2.1.1(1) gives the maximum spans for roof sheathing based on: the thickness of the sheathing. The sheathing panels are installed with a proprietary seam tape, which allows the system to be used as an alternate to underlayment required in Chapter 15 of the IBC and Chapter 9 of the IRC. R803.2.1 Identification and grade. The allowable unit stresses for fire-retardant-treated plywood, including fastener values, shall be developed from an approved method of investigation that considers the effects of anticipated temperature and humidity to which the fire-retardant-treated plywood will be subjected, the type of treatment and redrying process. Installed to prevent the passage of water into a structure from a joint or as part of a weather resistant barrier (WRB) system. The roof sheathing (plywood or OSB) has to be be nailed with 8D (eight penny) ring-shank round head nails at six inches on center. The typical thickness range for sheathing is 3/8 to 3/4 inch. Wood structural panels shall comply with the grades specified in Table R503.2.1.1(1). Spaced lumber sheathing for wood shingle and shake roofing shall conform to the requirements of Sections R905.7 and R905.8. A panel marked 32/16 may be used for roof sheathing over supports spaced up to 32 inches o.c. Minimum thickness to use for roof sheathing is 7/16" OSB or 1/2" plywood for trusses 24"O.C. If structural sheathing covers 40% or less of the exterior, continuous insulation R-value shall be permitted to be reduced by no more than R-3 in the locations where structural sheathing is used – to maintain a consistent total sheathing thickness.). Wood structural panel used as roof sheathing shall be installed with joints staggered or nonstaggered in accordance with Table R602.3(1), or EWA E30 for wood roof framing or with Table R804.3 for steel roof framing. The maximum allowable spans for wood structural panel roof sheathing shall not exceed the values set forth in Table R503.2.1.1(1). Wood structural panel used as roof sheathing shall be installed with joints staggered or not staggered in accordance with Table R602.3(1), or APA E30 for wood roof framing or with Table R804.3 for steel roof framing. "At least" seems also to imply that the ice & water membrane should ideally cover the entire roof (which I fully agree with even tho it's more expensive). ROOF SHEATHING FASTENING SCHEDULEa,b,c,d,e 8d Common (0.131 x 2-1/2 inches) or Ring-Shank (0.135 x 2-1/2 inches) (Except Where Noted) for Exposure B, Enclosed Buildings, Roof Framing Spaced 24 inches o.c. R803.2.1.2 Fire-retardant-treated plywood. Filter by product use. Can someone direct me to blogs or Q&A titles that address roof sheathing thickness? Is 1/2″ osb okay for a standing seam roof ( and other roofing materials ) or is 5/8″ preferred? The cabin is just 440 sf and is in zone 6. The most common rafter spacing is 24 inches, and 5/8-inch plywood is recommended for that. Only the maximum allowable span values, for each dimensional thickness of plywood are provided in the Table. support spacing when the panel is used for subflooring. I would ask your roofing rep, and/or a local design professional, for input, and let us know what you find out. 2018 IRC Residential Re-Roof WHAT YOU NEED TO APPLY FOR A BUILDING PERMIT: Permit Application Frequently Asked Questions ... longevity of your new roof: Roof Sheathing Preparation (for complete tear offs): 3 The roof sheathing must provide a ... penetrate through the total thickness of the roofing and a minimum of 3/4” into the decking material. R803.2.2 Allowable spans. R803.2.1 Identification and grade.Wood structural panels shall conform to DOC PS 1, DOC PS 2 or, when manufactured in Canada, CSA0437, and shall be identified by grade mark or certificate of inspection issued by an approved agency.Wood structural panels shall comply with the grades specified in Table R503.2.1.1(1). Inspect roof sheathing for proper thickness, grade, support, and fastening. The maximum allowable spans for wood structural panel roof sheathing shall not exceed the values set forth in Table R503.2.1.1(1), or APA E30. Where the roofsheathingislessthan 3/ 4 inch(19mm)thick,thefasteners 9.2 2010 FLORIDA BUILDING CODE — RESIDENTIAL ROOF ASSEMBLIES. Wood structural panel roof sheathing in accordance with Table R503.2.1.1(1) shall not cantilever more than 9 inches (229 mm) beyond the gable endwall unless supported by gable overhang framing. All wood structural panels, when designed to be permanently exposed in outdoor applications, shall be of an exterior exposure durability. 16”o.c. Any concerns about holding power of screws into OSB? The problem is compounded because the exterior foam layer and most common roofing materials prevent drying to the exterior. and 24”o.c. or for floor sheathing over supports spaced up to 16 inches o.c. The span rating on FLOOR SPAN panels appears as a single The fire-retardant treated plywood shall be graded by an approved agency. 5. R803.2.1.2 Fire-retardant-treated plywood. Apply eaves flashing to either spaced or solid sheathing in regions with an average daily temperature of less than 25°F (under the IRC) or in other areas prone to ice and snow buildup. Small cabin, 4/12 pitch, vented. R803.2.1.1 Exposure durability.
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