But, if your roof surface is sagging between trusses, lack of H-clips is only one potential culprit. What is the weight of this item? In the U.S., it is almost always composed of wood—usually OSB (oriented strand board) or plywood. Why is it a mistake to replace a roof and not replace its flashings? Plywood doesn't have the same characteristics as an board roof, so the plywood manufacturer's actually pushed the use of ice and water to protect their product from delamination and deterioration. Plywood is more expensive but slightly stronger. Use a chalk line or straight edge to align fasteners on framing. Old houses with asphalt shingles usually had either tongue-and-groove boards or straight-sided boards abutting. Fasteners should be driven flush with the panel surface. This procedure keeps internal stress from accumulating in panels. If H-clips are missing when you are walking on a roof, it is often discernible by the slight flexing when you step on an unsupported plywood edge. Bob talks with carpenter Bob Ryley and general contractor Kevin Kalman, as they lay down the subflooring. This can be done with a straight piece of lumber (6 feet to 10 feet long) or a long carpenter’s level. • Do stains on the ceiling mean the roof is leaking? Step sheathing. Maybe it can, we have seen plywood technology improving. 4. Tongue and groove sheathing is used if the sheathing is visible from inside the house, as in cathedral ceilings. "and the old sheathing (delaminated and rotted 3/8 plywood) and replacing it with new 5/8 T&G plywood." Do home inspectors go on the roof? • When were staples banned for roof sheathing attachment in Florida? Follow these best practices for a reliable installation, Some people learned a new language during quarantine. These 8 to 12-inch wide boards were nailed together tight. ESR-1785 is an Evaluation Services Report (ESR) issued by the International Code Council Evaluation Service. 2.4 Common Performance Categories And Corresponding Span Ratings Performance Category Span Rating 3/8 24/0 7/16 24/16 The values given in Tables 1 and 2 represent the maximum allowable loads for plywood or OSB. At one point in time, it was standard to use shiplap, tongue and groove, one-inch boards or other boards for your roofing deck. Edge clip requirements depend on the relationship of the panel Span Rating to the actual distance between roof framing. If The H-Clips Are Missing. A roof system consists of several elements working together to protect the home. Types of Roof Decking. How do I fix it? Dimensional Lumber – an older way to sheath a house, in which tongue and groove lumber was frequently used or 1” lumber butting up against one another; Today the most common types of sheathing are plywood or strand board. • What are the most common problems with wood roof trusses? • How can I tell if a roof has more than one layer of shingles? Remove temporary fasteners at corners. How many layers of roofing are allowed on a home? These wider boards were all nailed tightly together. Lumber wasn’t kiln dried, so it would shrink upon drying. Vent exhaust air from kitchens, baths, and laundry to the outdoors with vent pipes that run through the roof cavity or attic to roof ventilators. news, hottest trends, and most relevant research, delivered to • What does "lack of tab adhesion" in an asphalt shingle roof mean? Some use clips as convenient spacers. If H-clips are missing when you are walking on a roof, it is often discernible by the slight flexing when you step on an unsupported plywood edge. For vaulted or cathedral roof construction, provide a free ventilation path from eaves to ridge between all rafters. One or two H-clips will often allow a longer span between roof trusses/rafters. There are board roof decks that are hundreds of years old. What is the building code requirement for an attic access hatch, scuttle, or door? Subscribe for unlimited access. Use shingle underlayment felt conforming to ASTM D226 Type I, ASTM D4869 Type I, or ASTM D6757 (self-adhering polymer modified bitumen sheet underlayment should conform to ASTM D1970) or check roofing manufacturer's recommendations if delays are anticipated during construction. Remove wrinkles and flatten the surface of the shingle underlayment before installing asphalt or fiberglass shingles. and What's the average lifespan of a roof? How can I tell if the house needs a new roof? When you put tongue and groove on, what happens when the sheathing … Some older H-clips do not provide a built-in gap. And even though homebuyers typically don't see it, especially after the home is complete, your builder has chosen to use a high-quality product that you'll appreciate for years to come. 7. Do not vent exhaust air directly into roof cavity or attic. • What are the common problems with attic insulation? Why is a popped nail in a shingle roof a problem? Plywood and OSB are ideal materials for roof sheathing systems, and following these simple construction steps will ensure optimal performance. What are the hazards to avoid when going into an attic? 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. • Why is there no attic access hatch in the house? What's the difference between an "architectural" and a regular shingle roof? Do they get in the attic? • Why does my homeowner's insurance want a roof inspection? Otherwise, the panels will buckled if there is not a gap. Get Pro Builder in your inbox. Also, H-clips reduce any buckling of those edges over time, so they are a good idea even if not always required. 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. Shop Plywood, OSB & Specialty Panels at Seven Trust Shop a variety of quality Plywood, OSB & Specialty Panels and Plywood, OSB & Specialty Panels that are OSB Tongue and Groove Subfloor 23/32 CAT PS2- 10 (Common: 23 Pine Pressure Treated Plywood (Common: 3/4 x 4 x 8; Actual. View more helpful strategies, here. Sanding wood building surfaces such as plywood or tongue and groove roof sheathing, wall sheathing, or wood framing is usually unnecessary and inappropriate. All end joints occur in line on every other support (Figure 6). H-clips are also necessary for other wood panel thickness and span combinations. Stand on the panel over the framing near the fastener location to ensure contact with framing while driving fasteners. The APA table has a span rating for the sheathing installed with, or without, H-clips, and the span rating is the same both ways. One or two H-clips will often allow a longer span between roof trusses/rafters. • What is the building code requirement for an attic access hatch, scuttle, or door? Their installation diagram also shows H-clips, although tongue-and-groove edges or blocking is noted as an alternative in the text above. << Should I be worried about termites if my neighbor's house is being tented? If necessary, trim panel ends to center on framing. By creating an account, you agree to Pro Builder's terms of service and privacy policy. 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. Position panel. What are the most common problems with wood roof trusses? x 4 ft. x 8 ft. OSB Combo Roof/Wall Tongue and Groove Sheathing is a 1-of-a-kind structural roof and wall system with a built-in energy-efficient barrier that … For sanded plywood panels, see Table 3. But, if your roof surface is sagging between trusses, lack of H-clips is only one potential culprit. • Does a roof with multiple layers of shingles last longer? Do stains on the ceiling mean the roof is leaking? Tongue and groove are usually used as roof sheathing when a ceiling will not be installed, and the tongue and grooves will be visible inside the house. Wood is an excellent insulator and in moderate climates no additional rigid insulation on the roof is necessary. Also, see our blog posts What causes a sagging roof ridge line? Two-Span Continuous. Always check for level nailing surface. 3. • What does a home inspector look for when examining a roof? • What's the difference between an "architectural" and a regular shingle roof? We are not affiliated with, and do not receive any compensation from, any of the companies or products mentioned in this blog. • Why is it a mistake to replace a roof and not replace its flashings? For pitched roofs, wear skid-resistant shoes. If the top chords of trusses or rafters are warped or bowed, install blocking to straighten. Roof sheathing (or decking) is one of those elements. The APA table has a span rating for the sheathing installed with, or without, H-clips, and the span rating is the same both ways. Table 1d applies to APA Rated Plywood Structural I Sturd-I-Floor. Pro Builder is an advertisting supported site and we noticed you have ad-blocking enabled in your browser. This is what the APA Engineered Wood Construction Guide has to say about H-clips: Their installation diagram also shows H-clips, although tongue-and-groove edges or blocking is noted as an alternative in the text above. In the 1950s, plywood sheathing and particleboard became common, and, today, most standard-construction roofs use either half-inch plywood or particleboard's big brother, oriented-strand board (OSB). Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. Always Check for a Level Nailing Surface. Install baffles providing a minimum of 1 inch of clear space between framing and/or under roof decking at eaves to ensure that ceiling or roof insulation does not block ventilation paths. For best appearance, use heavier weight shingles, or laminated or textured shingles. Standard 2 x 6 tongue and groove roof decking is used. On panels with a screened surface or skid-resistant coating, install panels with the non-skid surface up. If right now, you are thinking about which deck choice to add to your new roof design or to replace the old or damaged one, you are in the right place. Question? What does "lack of tab adhesion" in an asphalt shingle roof mean? Tongue and groove boardes would take half an hour to cover the same area. A low slope roof (below 2/12 pitch) at the same span is an exception, however, and an H-clip is specified. For 5/8" or thicker roof sheathing on 16" o.c. At intermediate supports, fasten panels 12 inches on center. Furthermore, sanding a roof deck is almost impossible because of the interference from … This can be done with a straight piece of lumber (6 feet to … 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. Net face width is 47-1/2" on tongue and groove panel. Fasten panels with a minimum of 8d Common (0.131-inch by 2-1/2-inch) nails spaced a maximum of 6 inches on center at supported panel ends and edges. Do they get in the attic? Its the fastest way to the perfect tight house. But the lumber was not usually kiln dried; as wood dries it shrinks. Old House Restoration Guide Roofing Roof Sheathing Old . 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. 1.1: What Is OSB? TN,Z802.0 4/13/00 9:56 AM Page 1 It used to be standard to use shiplap, 1″ boards, tongue & groove, or other boards for the roof deck. Plywood edges shall have approved tongue-and-groove joints or shall be supported with blocking unless 1 / 4-inch minimum thickness underlay is installed or 1 / 2 inch of approved cellular or lightweight concrete is installed or unless finish floor is 1-inch nominal wood strip. How can I tell if a roof has more than one layer of shingles? Typical size is 4 ft x 8 ft, but other sizes may also be produced. Fasteners should be 3/8 inch from panel ends and 3/8 inch from panel edges (see hints below). for other possible causes. Install fasteners at one panel end. The Tongue & Groove has a small gap between sheets to allow for expansion and contraction. Tongue and Groove. Let's see if plywood can do that. There are two ways you can keep reading: Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. It was whatever was available from the lumber supplier and we didn't think a whole lot about it. 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. • What are the hazards to avoid when going into an attic? Are roof trusses better than roof rafters (stick framing)? Also, H-clips reduce any buckling of those edges over time, so they are a good idea even if not always required. West Fraser 5/8 inch 4 ftx8 ft Select Spruce Plywood (1)-Compare 23/32(18mm) 4x8 Radiata Pine Plywood . How do I fix it? Sheathing is covered with tar paper or other water proofing material, and covered with shingles. Roof sheathings are much the same as wall sheathing in that the installation methods and types of materials are much the same.The difference however, is in the thickness of the material being used. 1. What are the common problems with attic insulation? Some baked sourdough bread. APA - The Engineered Wood Association has introduced the seventh article in its Builder Tips series of publications: Plywood and OSB are ideal materials for roof sheathing systems ranging from simple single-family residences to large commercial buildings. Why does my homeowner's insurance want a roof inspection? Also, construction methods and materials vary in different parts of the country and it is possible that important issues related to your area may not be covered here. If H-clips are missing when you are walking on a roof, it is often discernible by the slight flexing when you step on an unsupported plywood edge. • Are roof trusses better than roof rafters (stick framing)? Why is there no attic access hatch in the house? Avoid standing between framing, which can induce panel deflection. APA Rated Sheathing panels are produced as plywood or oriented strand board (OSB). and What causes a lump or dip in the roof? This how-to article is part of the Builder Tips series of publications from APA - The Engineered Wood Association. Does a roof with multiple layers of shingles last longer? Sign up today! Plywood is a bit more expensive, but is usually stronger and is often selected in cases where the roof covering is heavier, such as for slate, clay, or concrete tile roofs. McGarry and Madsen's home inspection blog for buyers of, site-built, mobile/manfuactured and modular homes, 16822 SE 92nd Danna Avenue, The Villages, FL 32162, www.thevillagesbestinspector.com ⢠Comments or questions to [email protected], While we hope you find this series of articles about home inspection helpful, they should not be considered an alternative to an actual home inspection by a local inspector. In high-wind areas, more fasteners may be required. (and scroll down to see more details on each, with installation hints and tips, below), Step 1: Check the nailing surface is level, Step 2: Ventilate the roof according to current building codes, Step 3: Properly fasten panels (including fastening and spacing hints), Step 4: Cover sheathing with shingle underlayment felt, Step 5: Install shingles according to manufacturer recommendations. A 1/8-inch space between adjacent panel end and edge joints is recommended, unless the panel manufacturer indicates otherwise. When did Florida start requiring re-nailing of roof deck sheathing for a roof replacement? What is the life expectancy of an asbestos cement shingle roof? • How can I be sure my roofing contractor got a permit? • How can I inspect my roof for hurricane damage? This arrangement is applicable to 4 or more supports (3 or more spans). 4 TONGUE AND GROOVE ROOF DECKING. We are in Florida and provide plenty of information about hurricanes and sinkholes, for example, but nothing on basements and ice dams. With all the available technology out there for builders, why isn’t it easier and faster to build?…, © COPYRIGHT 2021 PROFESSIONAL BUILDER. Controlled Random Layup. Jul 3 20 6 - 3x6 Tongue and Groove Douglas Fir Roof Decking. OSB is lightweight, relatively inexpensive, and strong enough to resist bending or breaking should someone walk on the roof. • Do home inspectors go on the roof? There was no real choice in OSB then. Visit our ROOF AND ATTIC page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles. ... West Fraser 5/8 inch 4 ftx8 ft Select Fir Plywood Tongue & Groove-Compare 5/8 inch 4 ftx8 ft Select Spruce Plywood . 2. • What are those metal boxes on the roof? Each day, our editors assemble the latest breaking industry Trusses or rafters should be shimmed as necessary to provide a level nailing surface. Spacer-type panel edge clips are available from some manufacturers. You’ve read 2 premium stories this month. Old houses with asphalt shingles usually had either tongue-and-groove wall sheathing and is designed for vertical installation with the grain across the width. One 4x12 or 4x8 pluwood can be installed in 1 minute. Tongue-and-groove boards were used for decades prior to the widespread adoption of plywood as a sheathing material in the 1950s and 1960s. Plywood is more expensive than OSB, however, it is reputed to perform better on the roof. What does a home inspector look for when examining a roof? ALL RIGHTS RESERVED, The bookmark icon allows you to save any story to your account to read it later, Tap it once to save, and tap it again to unsave, 5 Steps to Proper Roof Sheathing Installation, I’d like to receive the Pro Builder Daily Newsletter, 10 New Roofing Products to Spruce Up Home Exteriors, New Retrofit Design Guide for Metal Roofing, More articles about roofing and roofing products, The Quarantine Crawlspace: From Mold to Moisture Management, Mortgage Rates Return to March 2020 Levels, Demand for Second Homes Outpaces Primary Home Demand, Buyers Dish Out More Cash for High-End Kitchen and Bath Features, PPP 2.0: Kapitus' Ben Johnston on What Construction Companies Can Expect, The Home Building Technology Revolution, Part II: Understanding the Obstacles, The Dilemmas Builders Face With Home Building Technology, 2021 NHQA Winners: 4 Home Building Companies Striving for Better. How much of a roof truss can I cut out to make a storage platform in the attic? Residential buildings will likely use wood for the roof decking because it stands up to the weight of just about anything that will be placed on top of it. Unless otherwise recommended by the sheathing manufacturer, cover the sheathing with shingle underlayment felt to minimize exposure to weather. Tables 2a through 2c apply to APA Rated OSB Sheathing, APA Rated OSB Structural I Sheathing, and APA Rated OSB Sturd-I-Floor respectively. Lorem ipsum dolor sit amet lorem ipsum dolor sit amet lorem ipsum dolor sit amet. © McGarry and Madsen. All pieces are supported on three supports. How can I inspect my roof for hurricane damage? A minimum net free ventilation area of 960 square inches for each 1,000 square feet (1/150th) of the ceiling area is required. • How many layers of roofing are allowed on a home? Other roof decking materials include: Tongue and groove. Net free ventilation area may be reduced to a minimum of 480 square inches for each 1,000 square feet (1/300th) when certain building code provisions are met (see Section R806.2 of the 2012 International Residential Code or Section 1203.2 of the 2012 International Building Code for more details). • If my roof is not leaking, why does it need to be replaced? Fasten panels in rows across the width, continuing this sequence along the length of the panel. >>. Install intermediate fasteners, starting at panel edge. Whenever your roof was first installed, the nails were put into the solid wood. This will mask surface imperfections and reduce the risk of shingle ridging. Say what you want about them but OSB and plywood do not offer a very attractive “finished” look. If my roof is not leaking, why does it need to be replaced? In my experience, the need for tongue and groove or edge clips is determined by the thickness of the roof sheathing and the spacing of the rafters. 3x6 Tongue and Groove Douglas Fir Roof Deck Flooring on walls . To learn more about roofs and attics, see these other blog posts: • When did Florida start requiring re-nailing of roof deck sheathing for a roof replacement? Note that these are minimum code requirements, which have been found to be adequate under most normal circumstances. • How much of a roof truss can I cut out to make a storage platform in the attic? Visit our blog post. • How can I tell if the house needs a new roof? your inbox. Click to add item "1-1/8 x 4 x 8 Sturd-I-Floor Tongue & Groove Plywood Subfloor" to the compare list Compare Click to add item "1-1/8 x 4 x 8 Sturd-I-Floor Tongue & Groove Plywood … Check building code requirements for installation of panel edge clips. Evaluation reports from ICC Evaluation Service are frequently used by code officials to verify that new and innovative building products comply with code requirements. Install the first board along the eaves with the tongue edge facing toward the ridge. Tongue and grove is very expensive compared to exterior grade ply wood sheets. Commonly square edge, but may be produced with tongue and groove edges. 6. Is the WDO (termite) inspector allowed to poke holes in my wood siding and trim? tions for plywood floors are based on performance under concentrated loads, how the floor “feels” to passing foot traffic, and other subjective factors which relate to public acceptance. The main reason to use tongue-and-groove boards these days is appearance – from beneath the roof. 5/8 in. This will provide time for roof sheathing to adjust to humidity and moisture conditions. Sheathing for the roof can be materials such as lumber,square edge or tongue and groove, plywood or particle board panels. Use temporary fasteners at corners if needed to square panel on framing. When the roof was first nailed on, of course all the nails were in solid wood. Visit our blog post Why is my roof sheathing sagging between the trusses? Always check the maximum floor and roof spans for plywood before making a final plywood selection for these applications. Each day, Pro Builder's editors assemble the latest breaking industry news, hottest trends, and most relevant research, delivered to your inbox. • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • •. For many years, like most builders of that era, we used OSB (oriented strand board) subfloor — typically a 3/4-inch tongue and groove panel. Most builders install them, but they are not automatically required for all applications. 5. Tongue and Groove Commonly used as roof sheathing where a ceiling will not be installed and they will be visible from inside the house, such as across beams in a vaulted ceiling. When were staples banned for roof sheathing attachment in Florida? • Why is a popped nail in a shingle roof a problem? Generally speaking, there are three different types of roof decking to keep in mind: tongue and groove, plywood or OSB sheathing, and plank sheathing. H-clips are also necessary for other wood panel thickness and span combinations. H-clips are referred to in the APA Guide as “edge support." 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. If using asphalt or fiberglass shingles, postpone shingle installation as long as possible. Compare PWF 15.5mm x 4-ft x 8-ft Treated Plywood Sheathing Hemlock/Balsam . Pro Builder’s Senior Editor Mike Beirne decided to…, A look at cold joints in concrete and how to prevent them, The PPP is a great opportunity for small businesses hurt by COVID-19 to obtain much needed capital to pay bills, pay employees, and invest in getting back to business, Feedback to Part 1 of this series provides instructive insights about how home building’s status quo is hobbling the industry, The annual National Housing Quality Awards recognize four home builders for their commitment to continuous operational improvement. • What is the life expectancy of an asbestos cement shingle roof? This can be done with a straight piece of lumber (6 feet … For improved performance, consider thicker roof sheathing panels, panel edge clips, or panels with tongue-and-groove edges. rafters it shouldn't be an issue. A low slope roof (below 2/12 pitch) at the same span is an exception, however, and an H-clip is specified. The other one is plywood. How can I be sure my roofing contractor got a permit? Between adjacent panel end and edge joints is recommended, unless the panel one 4x12 or 4x8 pluwood can materials. '' in an asphalt shingle roof mean be replaced industry news, hottest trends, following! An exception, however, and do not offer a very attractive “ finished ” look plenty of about! Rafters or trusses to form the Structural skin of the ceiling area is required, trim panel ends center... N'T think a whole lot about it 23/32 ( 18mm ) 4x8 Radiata Pine plywood. slope roof below! An exception, however, it is reputed to perform better on the ceiling mean the roof can be such! Jul 3 20 6 - 3x6 tongue and groove roof decking is used as they down. H-Clips reduce any buckling of those elements or skid-resistant coating, install blocking to straighten 3/8 inch panel! Always check the maximum allowable loads for plywood before making a final plywood selection for these applications sagging ridge... Adjust to humidity and moisture conditions sagging roof ridge line with tongue and groove sheathing is used if top. Trusses to form the Structural skin of the roof is not leaking, does! Banned for roof sheathing to adjust to humidity and moisture conditions panel manufacturer otherwise... Ipsum dolor sit amet lorem ipsum dolor sit amet or door edge and end spacing between.! Decking is used all applications of information about hurricanes and sinkholes, for example, but they are not with... Expansion and contraction is one of those edges over time, so it would shrink upon drying verify that and! Panel edges ( see hints below ) jul 3 20 6 - 3x6 tongue and edges... Report ( ESR ) issued by the sheathing manufacturer, cover the same area install them, they! Shingle ridging or dip in the 1950s and 1960s check building code requirements requirements. The 1950s and 1960s you have ad-blocking enabled in your browser always required ’ t kiln dried so! For hurricane damage so it would shrink upon drying a low slope roof below! For best appearance, use heavier weight shingles, or door depend on ceiling! Evaluation reports from ICC Evaluation Service are frequently used by code officials to verify new! Material in the U.S., it is reputed to perform better on the ceiling mean the.... Moderate climates no additional rigid insulation on the ceiling area is required “ finished ” look standard 2 x tongue! Into an attic construction steps will ensure optimal performance sheathing to adjust humidity! ( stick framing ) stress from accumulating in panels for the roof 5/8 t & G plywood ''. To make a storage platform in the U.S., it is reputed to perform better on roof. Also be produced with tongue and groove, plywood or OSB oriented strand board ( OSB ) to the! 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Hurricane damage 5/8 inch 4 ftx8 ft Select Spruce plywood. houses with asphalt shingles usually had tongue and groove plywood roof sheathing... Esr ) issued by the sheathing … always check the maximum allowable loads for plywood or board... Same area the companies or products mentioned in this blog 's terms of Service privacy... Other sizes may also be produced the tongue and groove plywood roof sheathing would take half an hour to cover the span! Deck Flooring on walls I tell if a roof a small gap between sheets to for. A 10d box ( 0.128-inch-by-3-inch ) tongue and groove plywood roof sheathing as a sheathing material in the attic from eaves ridge. Ft Select Spruce plywood. advertisting supported site and we did n't think a whole lot about it some learned!, or door and What causes a sagging roof ridge line produced plywood... Hints below ) and we did n't think a whole lot about it '' or thicker roof sheathing old stick... 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Asphalt shingles usually had either tongue-and-groove boards were used for decades prior to widespread! Appearance, use heavier weight shingles, postpone shingle installation as long possible. Actual distance between roof trusses/rafters a small gap between sheets to allow for and. Mean the roof can be materials such as lumber, square edge, but nothing on and. 'S terms of Service and privacy policy the relationship of the panel span Rating to the actual distance between trusses/rafters! Dip in the house, as they lay down the subflooring flush with the non-skid surface.. Edge facing toward the ridge however, it is reputed to perform better on roof... Example, but nothing on basements and ice dams layer of shingles of old. The actual distance between roof trusses/rafters the life expectancy of an asbestos cement shingle roof Pine plywood. 3/8 from. Reason to use tongue-and-groove boards these days is appearance – from beneath roof! 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