plywood over tongue and groove roof
Eight years ago, I had a new city bank roof installed on my 55-year-old home. 18mm Softwood Plywood Tongue & Groove Flooring 2400mm x 600mm (8' x 2') Softwood plywood T&G (4) panels are specifically designed for use in domestic flooring - although could be used for example on roofs where a high level of engineering, such as high snow loading, is required. This Tongue and Groove Decking combines appearance grade with unsurpassed quality of finish, making them ideal for exposed ceiling applications. Errors will be corrected where discovered, and Lowe's reserves the right to revoke any stated offer and to correct any errors, inaccuracies or omissions including after an order has been submitted. On the four foot edges, your seams will fall on joist tops, so no need for tongue and groove. A. Have a helper stand on the seam to align the tongue with the groove, then rap the 2x4 with the sledge. Plywood presents a smooth, continuous surface whereas OSB’s surface looks like a pieced-together puzzle of wood fragments. For subflooring, you use tongue and groove plywood. By putting a plywood overlay on top of the boards we can then ensure that we have a roof deck that is going to adequately support our roofing system properly and not cause issues later. 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. Say what you want about them but OSB and plywood do not offer a very attractive “finished” look. Once the joint is tight, drive in a couple of screws or nails to hold it, then slide the 2x4 down along the edge of the plywood sheet and repeat the process. But many contractors still have mixed feelings when it comes to using the material on a roof. For example if your joists are 16" on center, they will warranty ceramic tile on as thin as 5/8" tongue and groove span rated plywood. 6. When exposed to moisture or high humidity, plywood is up to seven times more resistant to thickness swell than substitute wood-based panels. Image Source: Q. With tongue and groove decking you don't have these gaps, therefore no reason to cover with plywood. 3 4 Tongue And Groove Roofing Plywood Home Depot October 24, 2003|By Tim Carter. Types of Roof Decking. Find Tongue and groove plywood at Lowe's today. Prices, Promotions, styles, and availability may vary. Step sheathing. 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. So my house has 2x6 car decking/tongue and groove/whatever-you-want-to-call-it subfloor that I am going to tile over, both in the kitchen and the bathroom. Bob talks with carpenter Bob Ryley and general contractor Kevin Kalman, as they lay down the subflooring. Our local stores do not honor online pricing. Sign up below for news, tips and offers. Coupled with OSB's weakness to moisture resistance (especially at the edges), some people just feel safer with plywood and are willing to pay extra. Leaks afresh started to arise in several areas of my home, and, aloft inspection, beam nails absolutely had backed out and popped through the shingles. Rigid foam is very similar to wood fiberboard in application. Also, routing six V-Grooves into the full length of a 8′ sheet of plywood would probably take more time than what it took me to rip and bevel. Step sheathing is typically reserved for shingle, shake, and tile roofs. Obviously, the surface material of a roof is very important. How Much Square Footage Do I Need for a New Home? The panels may vary in thickness somewhat, but typically 1/2-inch-thick structural wood panels are used on roofs with trusses/rafters at 2 feet on center, though panels down to 7/16 inch may be used, particularly stronger plywood. The keyword here is “solid.”. As roofing contractors in Seattle we are often asked, why do we need plywood over our old solid sheathing? Other roof decking materials include: Tongue and groove. You can tell the difference between plywood and OSB with one glance – externally anyway. Screw 4" on center over the whole floor, and into the joists with stainless or coated deck screws. If the current subfloor has tongue-and-groove hardwood planks, check to see if it is attached directly to the joists or if it’s on top of another subfloor. 2 in. The main reason to use tongue-and-groove boards these days is appearance – from beneath the roof. Notwithstanding that fact, a lot of people still prefer using OSB. Thankfully, there are OSB materials today that are designed to be moisture-resistant. Once you have that, go lay your new plywood on top of your existing plank subfloor. T&G roof decking, however, looks classy and rich. The main reason to use tongue-and-groove boards these days is appearance – from beneath the roof. Once that moisture is gone, both types can return to near original dimensions and strength. Assuming it looks like what I am thinking, the tongue and groove will likely last a century longer than the plywood ever will. But it's nice to know that if you do have special needs – such as an exposed interior ceiling – there are options that can accommodate you. 5/8 in. luckydriver. Lumber wasn’t kiln dried, so it would shrink upon drying. Foam, like fiberboard, can be installed over the top of OSB, plywood, or T&G boards in a cathedral ceiling application, but for roofing purposes it is most commonly installed on flat surfaces with built-in support underneath. Crawl Space vs. One way to install the upper cabinets is to hang the cabinet front face from the roof ribs. The Tile Council of North America (TCNA) calls for a subfloor of 19/32-inch tongue-and-groove plywood to be installed over wood joists spaced 16 inches on center, with a 1/8-inch gap between sheets. The rest of … But I … It has a dimensional stability and high strength. Plywood is a highly stable panel. Sheathing works with other components of the roof as well. Then just use a plywood floor between the front face and the wall. As long as you are using a durable, substantial 4 x 8-foot sheet of building material, the trusses should have something to keep them together and the roofing material something to fasten to. Why re-sheet over shiplap? The only resolution I can come up with is to deck over the t&g with plywood of a thickness that when combined with the t&g won't allow the nails to penetrate all the way through. Ventilation, for example, is needed so that the sheathing doesn't warp or swell under humid conditions. Say what you want about them but OSB and plywood do not offer a very attractive “finished” look. Upvote. What is included in a set of house plans? Most of your decisions about roof sheathing will come down to OSB vs. plywood. Simply because it outperforms all substitute wood-based panels on the market today. Felt wrap is installed over the sheathing to create a barrier between it and the bottom of the roofing material above. Plywood can be painted, stained, or ordered with factory applied stains or finishes. Here's how some popular sheathing options stack up in those categories. The best builders use ZIP System sheathing and tape. A. Why did this happen? Whenever your roof was first installed, the nails were put into the solid wood. For improved performance, consider thicker roof sheathing panels, panel edge clips, or panels with tongue-and-groove edges. Sheathing is installed over multiple trusses/rafters, so it essentially turns them into one cohesive unit instead of individual structural members. The contractors want to replace this sheathing with plywood (1/2" CDX) because the tongue-and-groove planking is “expensive” and “hard to get”. Why Multiple Bedroom Suites Are a Hot Feature in New Homes, What You Need to Know about Vertical Siding, No thanks, I prefer paying the full price, Follow us on these social networks to stay connected. 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. (Building codes require the roofing underlayment.) Roof sheathing provides an area where the surface material can be attached, but it also helps keep the trusses and/or rafters properly spaced. … Sheathing for the roof can be materials such as lumber,square edge or tongue and groove, plywood or particle board panels. 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. Is This the Year You Finally Build Your Dream Home? novice: want to insulate over asphalt shingle cottage roof Any help gratefully received: 1953: northern Michigan near Traverse City, my parents had a 900 s f tongue and groove cottage built. It used to be standard to use shiplap, 1″ boards, tongue & groove, or other boards for the roof deck. Q. " 5/8 inch 4 ft. x 8 ft. Tongue-and-groove boards were used for decades prior to the widespread adoption of plywood as a sheathing material in the 1950s and 1960s. If the tongue-and-groove joint doesn't close up, the plywood might be slightly warped. No matter the material, however, a roof wouldn't be possible without the sheathing below. Today, a shiplap roof is usually 60+ years old. 7. For more information, click here. What to Expect When You’re Building a Home from the Ground Up, 10 Features to Look for in House Plans 2000-2500 Square Feet, 2x4 vs 2x6 Exterior Walls for New Home Construction, A Guide to Garage Shop Plans, Mother in Law Suite Plans & Other Garage Ideas, 1. T&G boards must be 5/8 inch thick if used on 2-foot-on-center rafters. At one point in time, it was standard to use shiplap, tongue and groove, one-inch boards or other boards for your roofing deck. If you have gaps in your decking boards, there is no way to guarantee that the "true" nail line won't end up over a gap. I still have the question that I raised previously about why I should use a material that allows water vapor to pass through it." Yes. This will ensure that the strength of the plywood is enough to bridge spots on the roof where the old plywood was weakened to the point that it would sag under the load on the roof. These wider boards were all nailed tightly together. Tongue-and-groove boards were used for decades prior to the widespread adoption of plywood as a sheathing material in the 1950s and 1960s. One of the main problems in using gypsum board as a dedicated roof sheathing is the fact that it's not designed to hold fasteners. It eliminates the problem of moisture absorption! The material is soft and dense which means it doesn't stand on its own as a pitched roof sheathing. Upper Rear | Orton Travel Transit (ortontransit.info) Asphalt shingle roof. But to start off, we will need to remove the tongue so the plywood is tight with the exterior ICF walls. Products under $300 excluded. Most Western Washington residential homes during this time were built with shiplap roof decks rather than plywood. This then creates a weakened area more prone to cupping, curling, splitting and even cracking over time. Over time, shiplap fir wood resin dissipates, causing the boards to shrink, crack, form knot holes, and become extremely brittle. Select Fir Plywood Tongue & Groove Why Plywood? Prices and availability of products and services are subject to change without notice. Made from strands of wood that are cut and stripped from logs and glued together in cross layers using a strong adhesive under high pressure to form a strong structural board, OSB has cornered the lion's share of the market when it comes to walls and flooring. Advantages / Disadvantages, Beachfront, Key West Style, and Other Waterfront Home Ideas. Plywood can delaminate and solid wood swell when exposed to moisture. Plywood is more expensive than OSB, however, it is reputed to perform better on the roof. Shop plywood and a variety of building supplies products online at Lowes.com. You also should consider the design parameters of the roof to ensure that the extra weight of the added plywood is well within the static load capability of the roof support structure. 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. In actuality however, the perfect sheathing materials are lightweight, dimensionally stable, strong, and affordable. The standard fir plywood is ideal for interior and exterior roof, wall and floor sheathing. Plywood is made of thin veneers stripped from a spinning log and laminated together perpendicularly under pressure, usually 5-7 layers thick. Its the fastest way to the perfect tight house. U-Shaped House Design: A Mix of Function, Form, and Style, 10 Home Building & Design Trends from the International Builders' Show, Tricks, Tips, and Uses for Architectural Trim Work, Modern Farmhouse: Contemporary Twist on a Classic, Stick-Built vs. Truss-Built Roof: The Pros and Cons of Each, 8 Common Home Lighting Mistakes – And How to Avoid Them, Winter Preparedness Checklist for Your Home. They are the most readily available sheathing and can accommodate virtually any type of roofing material. So I want to insulate, but on top of the roof. Forget how I attached the cabinet floor to the wall. These 8 to 12-inch wide boards were nailed together tight. Even delaminated plywood can have near new strength. 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. After the 1960s, the predominant residential roofing substrate became 1/2″ CDX plywood. Basement? Almost every roof sheathing comparison/debate comes down to plywood vs. OSB. To receive your discount, enter the code "NOW50" in the offer code box on the checkout page. It is dense and insulating but not sturdy enough to be the sole sheathing on a pitched roof. It is light and easy to work with. Plywood floor at the wall sits on edge of plywood that is bolted to the wall. The “big two” when it comes to roof sheathing is oriented-strand board (OSB) and plywood. As long as the new plywood itself can span the distance and carry the roof, wind, seismic and snow loads for your region, adding new ply over old is just fine. The question that arises is, “does sheathing material matter?” At first glance it wouldn't seem so. It can be installed over plywood or OSB sheathing, but the most common use is on flat slope roofs where there is already a hard surface underneath. Whether you choose to install metal, asphalt, tile, fiber cement, wood shakes, etc., the top of your roof is what gives it its aesthetic value and durability characteristics. Building on Slab vs. A panel of OSB is typically heavier than plywood, yet not as stiff, so it could be prone to some sagging between trusses/rafters, especially if they are set 2 feet on center. For spans greater than 2 feet – up to 6 feet – the boards must be 1-1/2 inches thick. The tongue and groove are only along the 8 foot edges. Link to Lowe's Home Improvement Home Page, 23/32-in x 4-ft x 8-ft Pine Plywood Subfloor, 23/32-in x 4-ft x 8-ft Douglas Fir Plywood Subfloor, 1-1/8-in x 4-ft x 8-ft Douglas Fir Plywood Underlayment, 1-1/8-in x 4-ft x 8-ft Pine Plywood Subfloor, 3/4-in x 4-ft x 8-ft Douglas Fir Plywood Sheathing. We will never share your email address. This is one of the reasons why some people prefer using plywood for their roof or subfloor. 5/8x4x8 - Plywood Fir Standard - Tongue and Groove. Plywood is available with squared or tongue and groove edges, the latter of which can help to reduce labour and material costs by eliminating the need for panel edge blocking in certain design scenarios. If it is attached to the joists, you can use the 1 ⁄ 4 -in. The reason to use OSB would be cost – about $3 less per sheet than plywood – but the reason to avoid it would be that OSB is more susceptible to damage from moisture than plywood. You need an air barrier of some type above the tongue-and-groove boards, and you need roofing underlayment under the roofing. Tongue and Groove Decking provides the customer with an outstanding solution for roof and subfloor structure where exposed to the lower level. Dream House Wish List Ideas and Must Have Rooms, Building a Home Plan with an Indoor Basketball Court, Exterior Sheathing – Top 5 Exterior Wall Sheathing Options for New Home Builds, What Comes Next? The sheathing for the roof was originally tongue-and-groove planking (it’s a 1950’s brick ranch with a typical sloping roof, in NC). 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. This should be followed by a second layer of 15/32-inch-thick plywood installed with a … It was, sadly, too heavy and expensive to use as subfloor material and would be way too heavy for roof sheathing. Footnote: The lead image of this article is courtesy of Lowes, where you can buy roof sheathing. It is manufactured with waterproof glue. Both OSB and plywood should be installed with the long edge perpendicular to the trusses/rafters. BCIN - Is This Something I Need When Building My Home? x 6 in. A 1/8-inch space between adjacent panel end and edge joints is recommended, unless the panel manufacturer indicates otherwise. Wood fiberboard is most commonly used in wall sheathing because it provides insulating and soundproofing properties. The underside of the roof, the supporting beams, all are visible and beautiful to me. Generally speaking, there are three different types of roof decking to keep in mind: tongue and groove, plywood or … Product specifications. When it's used as a sheathing for siding for example, fasteners need to go through the gypsum but also only into wall studs. If you simply routed a V into 1/4″ plywood you would end up with a very shallow V-Groove which wouldn’t mimic the look of a true 1x tongue and groove plank. Using gypsum as sheathing is rather rare for residential jobs, but it is still found in commercial / low-slope roofs in the same manner as fiberboard and rigid foam. How to Present Your Best Self: 9 Tips on Selecting the Perfect Bathroom Lighting. The other one is plywood. Check building code requirements for installation of panel edge clips. Have that, go lay your new plywood on top of the roofing.! Code requirements for installation of panel edge clips needed so that the sheathing below to. Are often asked, why do we need plywood over our old solid sheathing plywood on of... Installed with the exterior ICF walls usually 5-7 layers thick however, lot. 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Use as subfloor material and would be way too heavy and expensive to use tongue-and-groove boards days..., plywood or particle board panels cover with plywood question that arises is, “ does sheathing material the!, Key West Style, and affordable bank roof installed on my 55-year-old Home bcin - is this the you... To insulate, but on top of the reasons why some people prefer using plywood their! We are often asked, why do we need plywood over our old solid sheathing thick! Will come down to plywood vs. OSB are the most readily available sheathing and tape were nailed tight... Under the roofing advantages / Disadvantages, Beachfront, Key West Style, and may. The supporting beams, all are visible and beautiful to me is bolted to the joists you. And insulating but not sturdy enough to be moisture-resistant tongue with the long edge perpendicular to the trusses/rafters,... To me it would n't seem so arises is, “ does sheathing in! For news, Tips and offers underlayment under the roofing OSB,,. Boards must be 1-1/2 inches thick solid sheathing floor sheathing plywood that is bolted to the lower level does warp., why do we need plywood over our old solid sheathing this article is courtesy of Lowes, you! Unsurpassed quality of finish, making them ideal for exposed ceiling applications roof as well sadly, too for! Checkout page had a new city bank roof installed on my 55-year-old Home edge,..., looks classy and rich roof or subfloor and laminated together perpendicularly under pressure, 5-7. Any type of roofing material above residential roofing substrate became 1/2″ CDX plywood and exterior roof the.