If you install your metal roofing directly on plywood without the protective layers, you greatly increase the odds of the roof leaking. I would recommend a minimum 5/8" plywood with 30 lb felt under the steel to provide a good base for the screws. I don't think I explained it well. Cross-linked polyethylene, also known as PEX, is a lightweight and durable polyethylene thermoplastic with cross-links. Hammer down all raised nails. I was planning on putting plywood over the rafters and cross the rafters with a 2"x4" every 16" to secure the metal … I guess at 14x16 you won't be towing this one, but the wind still blows, and OSB does not have adequate holding power to resist the wind trying to rip the metal roof sheeting off. Use the reinforced SOLITEX MENTO Plus roof underlayment on top of your rafters. As my house is two stories, the wall above the roof will need the siding replaced as I tore it off for construction. The most common materials for this are oriented strand board (OSB) or plywood. Product recommendations not personally owned are based on the author’s knowledge of the company, product, reliability, and reputation. Do you have to build a sub-structure for metal roofing, or can you install it directly onto plywood? Why is plywood … Although it may seem counterintuitive, metal roofing can be attached directly to your building's roofing structure without the need and expense of plywood sheeting. How to Install Standing Seam Metal Roofing, link to Can PEX Tubing Be Buried? Cut the gutters to fit using metal snips. The metal can heat up from exposure to the sun and adhere to the tar-infused felt sheeting. You can start with this excellent YouTube video: This YouTuber also installed solar panels on the roof. Step 1: Use seam tape on plywood joints and flashing where deck meets the house (seam tape can be seen upon finished system.) Begin on the left side of the roof, working to the right. On top of this underlayment goes a slip which protects the material from tearing as the metal roof expands and contracts with changing weather. There is 9 in. Take care the first piece As a key part of the metal roofing system, the substrate (or substructure), which rests underneath the metal roof panels, serves two main functions. There are many factors that must be considered, including the appropriate installation method for the... My name is Paul (that’s my little helper, Mason, in the picture with me) and I am a bit of a fanatic when it comes to making sure my home is energy efficient. This is by far the most common way to install a metal roof. Closed cell polyurethane foam is the only type of insulation that meets or exceeds all international building codes, doubles the strength of frame structures, gives you the highest “R” rating per inch, forms its own vapor barrier and has an efficiency rating in the 90’s when all other insulation is in the 30’s and 40’s. Here at Roofing Superstore, we have a range of plywood boards that can be used for your project. This was in the days before various scaffolding and other equipment was commonly available. Metal roofing should serve both these purposes (I'm assuming by metal roofing you don't mean metal shingles). Talking about metal roof insulation, this thing is one of the most challenging things people work in this field is facing.It demands and requires excellent skill and expertise which you may only get from a reputable roofing contractor. Always begin working at the point with the longest peak-to-eave distance. Get it as close to the edge of the roof as you can without it sticking out past the eaves. If you attach metal directly to the plywood with no felt or slip sheet, it will not last as long as it should. Repair any rotted sections of plywood before installing the metal panels. My rafters are in place and now I’m getting ready to purchase and install my flashing and sheathing. Metal roofing screws need to go into framing. Also, on steep roof surfaces, the battens provided a “ladder” of sorts for roof access. A few basic safety precautions should always be observed when installing a metal roof: If you are installing metal roofing onto plywood, it is even more imperative that you have a solid base to place the metal roofing on. Even without heavy rain, humidity can build up between the metal roofing and the plywood and ruin the wood. Once you determine the structure to be safe and sound, you can begin installing the new metal roof. Wind will be able to get underneath the roofing and pull it off your roof. In order to avoid a “hump” at the transition from two layers of materials to one, the notation on the building plans advises to lower the roof purlins in these areas by 7/16”. This can be done in a few ways, including installing the metal roof on top of the existing asphalt shingle roof. If you are installing a metal roof on a structure like a patio cover, you may not need this insulation layer. To secure it, measure it, roll it out over the plywood, cut it to the dimensions of the roof with a roofing or utility knife and finally hammer it securely to the plywood with 1/2-inch roofing nails. The roof decking should never sustain water damage for the following reasons: Remove all unused vents, pipes and protrusions. Metal should be installed using a cold roof design so the typical metal assembly would be: (1) metal, (2) air space of 3/4" or greater using 1X4" or 2X4" purlins, (3) WRB, and (4) 5/8" to 3/4" of ply or OSB. Warping signifies that the wood is prone to rot and will prevent you from laying the metal roofing flat. Fortunately, it isn’t rocket scienceSF Gate Measure the length needed for the final top panel, mark the measurement with a pencil and cut the panel with metal snips. No - the purposes of the plywood roof decking are to give lateral stability to the rafters/trusses, and create a walking surface. There are two ways to do this - put in firring/nailing (though nails are not used any more for this) strips or purlins (in steel frame construction) on the roof to support it, or place the metal roofing directly on a flat surface like foam Take your first sheet of metal and place it on the roof so that it overhangs the edge at least 3 ⁄ 4 in (1.9 cm). This will also ensure the longevity of your investment. not directly … The attic does have ventilation from the soffit vents and ridge vent, the same with the back roof. Over the past two decades, my family has rehabbed houses and contracted new home builds and I've learned a lot along the way. plywood. Roof sheathing is made from wood, which is an organic material. The ends of an OSB … Overlap each row by 2 inches. Measure the length of the roof edge with a tape measure. of fiberglass insulation between the ceiling and roof on the back and about 9 or 10 inches in the attic floor. How to Install a Tin Roof on an Outbuilding. Roof Framing: The metal roofing panels must be installed over nominal 15/32" plywood or nominal 7/16" OSB. It is also advisable to use a slip sheet to protect the felt. About Experts Sitemap – Group 207 – Page 10 2012-07-20 I would use treated plywood as the subfloor then cement board on top of that and finally the stone using a standard liquid nails, stud walls: Hi Gary, You are going to want to blind nail it directly to the metal roofing, roofings, rubber roof: Hi Jim, The state of the art seems to … Read Article Cut the material to fit around the base of all protrusions using a roofing knife. Or, installing the new metal roofing over furring strips (1 x 3s or similar) will raise the metal and provide a … 1. Cut the roofing felt to fit with a … Be sure the larger edge is laid so that the small edge of the next panel will overlap it. I don't want the extra expense of the 1"x4"s if I don't have to use them. The plywood … The roofing felt will lay horizontally along the plywood deck of the roof. Also, there are numerous better underlayment products as mentioned above, including Grace Products and a host of others....all better than felt. As long as the plywood under the shingle roof is in good condition, this way can provide many benefits. Decking should be in place before other roof materials can be applied. Secure the metal panel to the deck by drilling 1-1/2-inch galvanized metal screws through the peak of the rib in 12-inch to 16-inch intervals. Now, if your plywood roof is currently sagging or rooted, there’s a great chance you have to fix is as soon as possible. In roofing, plywood can be used as roof decking. Lay waterproof felt material on the flat area of the roof. She works daily as a professional painter/home remodeler/handywoman while lending her husband's roofing business a helping hand in her spare time. 2. Roof decking is the material that lies on top of the main roofing structure, and the underlayment and roof covering are applied on top. While it’s not the main material for the roof itself, roofing plywood is an important part in a roofing structure. Weather conditions could affect this time, as well as other factors like the slope of the roof. Within minutes, beads of water form on the cold vessel and begin to drip down to the table or countertop. The panels are installed directly onto the roof’s plywood sheathing. Curved deck The deck layout doesn't have to be a simple square at the rear portion of your premises. Secure the metal panel to the deck by drilling 1-1/2-inch galvanized metal screws through the peak of the rib in 12-inch to 16-inch intervals. You may also want to install a slip sheet to protect the felt sheet from potential damage caused by the metal roofing. Install metal flashing along the edge of the roof using a hammer and 1/2-inch roofing nails. Sheet metal is the alternative to the asphalt shingle that is used today to cover sloping roofs. When installing metal roofing, you should always use a roofing felt layer between the metal roofing and the plywood. Hunker may earn compensation through affiliate links in this story. Install the ridge metal along the peak of the roof. 1/2" OSB alone won't hold the screws securely in the long run. R905.2.8.2 Complete and separate roofing systems, such as standing seam metal roof systems, that are designed to transmit the roof loads directly to the R803.2.1.2 Fire retardant treated plywood. Lipinskiy says that both plywood and OSB are sufficient, but that he does prefer OSB. I was planning on putting plywood over the rafters and crossing the rafters with a 2-by-4 every 16 inches as strapping to secure the metal roof. Begin on the left side of the roof, working to the right. As a homeowner, I am constantly experimenting with making the structure of my house more energy-efficient, eliminating pests, and taking on DIY home improvement projects. When the metal expands or contracts with changing temperatures, it can tear or wear away the felt sheeting. (Note: fasteners and clips would be attached into the substructure.) Metal roofing screws need to go into framing. 2. Building paper on a roof in the desert SW or high elevation climate is a quick way to destroy your roof sheathing and you will be tearing up that roof in a couple years. Cross purlin designs with 16 OC are sometimes called for; using nominal lumber 1X horizontal underneath and 2X vertical. Ensure that the line is square with the eave. Energy efficient and available in a variety of colors that will add value to your home, metal roofing is a wise choice for homeowners. Although adding a metal roof will add dead weight of only 0.8 to 1.5 pounds per square foot, it is crucial that you figure the weight capacity before determining whether it is safe to install the roof on top of another. Overlap the edge of the roof by 1 inch. If you have a bad leak in your roof for a long time, it might be best to get into the attic and look up at the roof to see if you notice any plywood that needs to be replaced. Homepage / Roof Insulation / The Guide on How to Insulate Under Metal Roof Panels Talking about metal roof insulation , this thing is one of the most challenging things people work in … Metal roofs are isolated structural components, with no direct path to ground inherent in their design. The metal will be attached to at least 3/4″ purlin and 1/2″ plywood instead of just 1/2″ plywood, which should make the overall roofing system stronger. Align the second panel straight above the first panel. If purlins are installed properly before the metal roof sections go on, it shouldn't be any less safe to walk on, or prone to damage, than any other type of roofing (probably less so). But the probably best benefit that comes from using purlins is the air gap it creates from the metal roof and the existing shingle roof. Even some metal roofing companies install the metal panels directly on the plywood. I was planning on putting plywood over the rafters and crossing the rafters with a 2-by-4 every 16 inches as strapping to secure the metal roof. The guide below will tell you on how to install metal roofing over plywood. In 2005, she began a career in roofing, interior design and remodeling. Once the slip sheet is installed, be careful when walking on it. Epilay™ Superior is specifically manufactured to replace the #30 felt. Mona Culberson began working on the assembly line at a large manufacturing company in 1983, where she worked her way up into several positions of business responsibility. Going back to SF Gate Home Guides, it’s pretty straightforward to install roofing plywood before installing your metal roofing panels: Sheathing comes in 4-foot by 8-foot sheets to install on rafters spaced 16 or 24 inches apart. Hi Todd, I have a pole barn design structure that had been turned into a livable dwelling with cathedral ceilings using rigid foam between the metal roof and the ceiling sheetrock, I am redoing this and putting a decking down with Tyvek Protec 200 and then reattaching the metal roof and adding circular pest resistant soffit vents at the end rafters of the roof between purlins for ventilation. Both plywood and OSB will meet the code. You also run the risk of premature wood rot, as the felt sheet provides a layer of moisture prevention that keeps the wood dry. If you are installing the metal roofing yourself, you can expect a significant time investment. The plywood should be clean and free of raised nail heads to provide a uniform deck structure for the metal. Warped wood should also be replaced. In this article, we are going to explore both financial and technical aspects when it comes to looking for the best method to insulate the metal roofing. Roof framing (rafters or trusses) shall not exceed 24 inches on center. Use metal snips to cut flashing material. It’s applied under all of the other materials, and it provides an extra layer of protection against extreme weather conditions. The back roof drops 12 ft in a 16 ft span. The goal of this website is to share with you all of the helpful tips and solutions that I have found so that you can ensure an energy efficient home for you and your family. 2 Measure the Roof Use measuring tools to find the length and width of the roof from the ground outside. Metal panels can be precut to fit the length of the roof, eliminating the need for trimming at the peak. As an Amazon Associate this website earns from qualifying purchases. Lay and attach plywood or OSB (oriented-strand board) to the exterior roofing structure of the shed. The plywood or OSB you use for a base underneath your metal roofing should be at least 7/16 inch thick. Install gutters in valleys as needed. You may be able to layer it on top of your current roofing, but you need to check with your local building codes before doing so. Overlap the edge of the roof by 1 inch. Install the first metal panel on the low end of the roof, square to the eave. Use galvanized staples to secure the felt paper onto the sheathing. Most construction sites will consider the use of either OSB or plywood for the roof. Metal roofing should not be installed directly over the top of bare plywood. Then the top of all your purlins, once OSB under metal roof panels is placed – will be in the same plane and the roof steel will lay flat. Division 07 Section "Sheet Metal Flashing and Trim" for formed sheet metal copings, flashing and reglets, and roof Tin sheets are an affordable alternative to adding shingles to the roof of your outbuilding, and they are much faster to lay than shingles. Snap a vertical chalk line 1/4 inch from the rake edge of the roof using a chalk box. Depending on the size of the roof, you can easily spend a week or more on the installation. Corrugated metal roof panels: While they didn’t used to be considered the best metal roofs for houses, corrugated metal panels are gaining popularity due to their strength, energy-efficiency and resistance to corrosion. You do not have to install roofing shingles or other roofing material, but a felt sheet over the plywood is the bare minimum. Always begin working at the point with the longest peak-to-eave distance. Guidelines, Differences, And Specs. Install waterproof felt over the plywood to add protection against moisture. (Instead, you can just secure the metal roof directly to the wooden beams.) This thickness will ensure that the wood is sturdy enough to hold the screws in place and support the metal roofing. Generally made from half inch OSB or plywood, this is what provides the bulk of the support for anything that hits, lands, or walks on top of your roof. If weight allows As long as the interior of your roof is protected from moisture accumulation, underlayment is not required, though homeowners planning to insulate their house heavily may choose to install plywood to protect their investment. Return to the low end of the roof and begin installing the next row of metal panels. To install the felt sheeting, roll it out, and attach it to the plywood with an industrial staple gun. Step 2: Apply 2 gallons per 100 sq. If trapped between the metal roofing and old roofing, moisture can build up and cause mold and rot. Add purlins on top of this for venting and drainage, then add horizontal purlins to mount the metal roof to. But roofers can install a vented metal roof that eliminates this potential problem. Inspect the plywood for damaged areas. The felt can be cut with a box knife to make sure it fits. Snap lock standing seam metal roof panels installed over a plywood roof deck with related metal trim and accessories. I share my hard-learned lessons so that you can save time and money by not repeating my mistakes. It serves as a structural member, transferring the weight of both live (ex: wind, snow, rain) and dead (ex: HVAC units, roof materials, etc.) Most metal roof companies recommend installing felt paper on roof sheathing before you install the metal roofing. Selecting the right underlayments for a lifetime metal roof should be a primary concern for anyone thinking about specifying or choosing to install a metal roof on their home. If the roof is not a walk-on deck, roofing by nailing down a metal drip edge to protect the exposed lower edge of the plywood and keep it from getting wet (see Illustration 1.) I've just put a plain, galvanized (shiny, no paint or color) metal roof on my home addition. The best system, as Martin alluded to above, is 1/2" OSB with 30 lb felt and then 1x4 purlins to allow an air gap between the felt and the bottom of the steel and to hold the roofing screws to attach the steel. Cut the roofing felt to fit with a utility knife. loads to the supporting joists or pur… Installing roofing tiles can be a complex process if you have never performed the task before. (Source: International Association of Home Inspectors). Install the first metal panel on the low end of the roof, square to the eave. Snap a vertical chalk line 1/4 inch from the rake edge of the roof using a chalk box. Guidelines, Differences, And Specs, International Association of Home Inspectors. DEAR TIM: I’m in the process of installing a metal roof over an outside deck. It acts as a base to which the metal roof material is attached-securing the fasteners and clips used to hold the panel. Metal roofing should not be installed directly over the top of bare plywood. Division 07 Section "Manufactured Roof Specialties" for manufactured copings, flashing and reglets, and roof OSB Under Metal Roof Welcome to Ask the Pole Barn Guru – where you can ask questions about building topics, with answers posted on Mondays. Trim the metal panels around all protrusions with the metal snips. The only thing that may impact this life expectancy would be a significant weather event or improper installation. When it comes to choosing what kind of plywood you need for the roof, it is important to understand the basic categories that you can choose from. The asphalt in the felt paper is waterproof and does a great job of protecting the untreated wood roof sheathing. Repeat step 7 for each row until all panels have been installed. You do not have to install roofing shingles or other roofing material, but a felt sheet over the plywood is the bare minimum. There is nothing wrong with plywood, but for me personally, we always go with the OSB, he says. The weight of your roof is not distributed on the plywood like it is in the case of installing asphalt shingles. Be sure to use plywood that is thick enough. That is why there is no "general rule" or "one size fits all" type of layup for metal roof underlayment. Add the metal panels. If we tend to book the corrugated iron for a shed, a garage or other shelter, it would be wrong to dismiss this type of roof for his house. You may also want to install a slip sheet to protect the felt … Attach the roofing felt with roofing staples. Ensure that the line is square with the eave. Underlayment is a vapor barrier or water-resistant material that’s put under metal roofing and installed directly onto the roof deck. Be sure to use stainless steel or galvanized nails. ... and then work directly with the manufacturer to find a qualified contractor in your area. Falling is the most obvious danger, but injuries from handling sharp metal edges and power tools are also common. It’s so important that you have to arm yourself with knowledge and know everything there is to know so you’ll know the best way to utilize it for your roof. By creating an account you agree to the Hunker, Yellow Pages: How to Apply Metal Roofing Over Plywood, YouTube: How To Measure And Install Multi Rib Or Armour Rib Metal Roofing. I wonder if it is okay to fix the metal roof panels directly to the plywood roof deck (with underlayment in between) or do I need to attach the panels to 1"x4" lath. Secure the felt to the plywood using a hammer and 1/2-inch roofing nails. Ensure that the plywood deck is strong enough to withstand the added weight of the metal panels. Take your first sheet of metal and place it on the roof so that it overhangs the edge at least 3 ⁄ 4 in (1.9 cm). This smooth, industrial paper is laid on top of the felt to protect the felt from the metal roofing material. Different Material Options & Types of Roof Plywood Yes, there are several different material options and types of roof plywood. Metal roofing is affordable, durable, and easy to install. Secure the gutters using a hammer and 1/2-inch roofing nails. This entry was posted in Architects, Building & Homeowners, Contractors, Metal Roofing, Standing Seam Metal Roof Panels and tagged Metal Roofs, Standing Seam Metal Roof, Underlayment on June 12, 2014 by Mitch Gaber. Remove the existing roof, if you have one. Installing metal roofing over plywood is less time-intensive and more affordable than a shingle roof, but there are still several steps you should take when installing a metal roof to plywood to ensure that your roof does not leak and will stand the test of time. If you ensure the plywood is in good condition and well protected before placing the metal roofing, you can expect the average life expectancy of your metal-on-plywood roof to be 40-70 years. I'm looking at replacing the roof. Yes, metal roofs are placed directly to the plywood over Icynene insulated roof sheathing, thats how I always had it done and warranteed! Over the years, a problem has developed with metal roofing installed over battens. Properly installed over plywood sheathing and the recommended underlayment, a metal roof isn’t noticeably louder during a rainstorm than one made of asphalt (52 decibels versus 46). I was planning on putting plywood over the rafters and crossing the rafters with a 2-by-4 every 16 inches as strapping to secure the metal roof. This helps to weatherproof the roof. Make sure that you or the roofing company you hire uses the proper plywood protection and follows the correct installation steps to offer full protection to your home. Let’s go over how to correctly install metal roofing over plywood. A potentially easier option is to use purlins (on top of the rafters) rather than framing between the rafters. Adjacent areas of healthy plywood may eventually become rotten, and then the screws you have placed there will not hold. ft. Elasto-Barrier® and embed Contouring Roof Fabric™ into wet coating. Since your subroof will be waterproof, well drained and airtight this will be a cost effective solution to build your roof (saving the cost of plywood). The allowable unit stresses You will also find out what to look for when determining if the roof is stable enough to have metal directly installed over it. Take care the first piece is aligned precisely perpendicular (square) to the edge. That sheathing is covered with an underlayment that is designed to be waterproof, helping to stop any moisture that makes it past the shingles or metal. Install rubber pipe boot kits around all vent pipes. The quality and type of underlayments used on the project in the long term will affect the overall performance of the roof. Overlap the edge of the first panel by 12 inches. This site is a participant in affiliate programs such as Amazon Associates and earns from qualifying purchases. Not only can it be difficult to maintain traction on a sloped roof, but you could tear the slip sheet and cause it to slide out of place. Hip Roof vs. Gable Roof: What to Consider & How to Choose December 1, 2020 Types of Standing Seam Metal Roof Clips & Why They’re Essential October 29, 2020 Protecting Metal Panels from Rust October 15, 2020 There are many considerations and in-depth guides for installing metal roofing onto plywood, so if you are doing the installation yourself, be sure to educate yourself fully on the intricacies of the install. An experienced roofer can help you pick out the right one, but it’s good for you to know what these options are. There are two ways to do this - put in firring/nailing (though nails are not used any more for this) strips or purlins (in steel frame construction) on the roof to support it, or place the metal roofing directly on a flat surface like foam insulation board or the roof sheathing (with roof water barrier in the correct position in … (Source: McCoy Roofing). But deciding where and how to install it requires some knowledge of building materials and their potential pitfalls. (Instead, you can just secure the metal roof directly to the wooden beams.) 3) Install 1×4 Purlins down over the Shingles before Installing the Metal Roof The third way to install a metal roof over shingles is by applying 1×4 purlins over the shingle roof. Extend the roofing felt paper by 2 to 3 inches all round the roof perimeter. Can I install the metal roof over the Ice shield or do I need the 1 X 4 battens every 2 feet as well, It’s a low slope roof thus the ice shield for extra protection. You can install metal roofing over plywood; however, you need to carefully inspect the plywood to ensure it is safe to use, and you must use the proper materials. It is important that you cover the sheathing with standard roofing felt paper before placement of the panels. Add the metal panels. That is the core of why we do not add much weight to the roof. Make sure you overlap each layer by at least 4 inches. Roll excess Elasto-Barrier® over top of the Contouring Roof … Work toward the ridge. Work toward the … Sweep the plywood clean of all dirt and debris with a push broom. As anyone who has installed a roof can tell you, there are some inherent dangers when working on the top of a sloped roof. Continue until you reach the peak of the roof. If choosing this option, it is important to note that one layer of shingles weighs from 2.4 to 3.2 pounds/square foot. Mike the Pole Barn Guru also, on steep roof surfaces, the same with the eave this option it... Paper on roof sheathing before you install it directly onto the roof edge with a box knife attached! There will not hold easily spend a week or more on the roof, working to the table countertop. The roof edge with a tape measure roof perimeter until all panels have been.. Or pur… ( Instead, you greatly increase the odds of the other materials, and used regularly by author... Give lateral stability to the table or countertop but injuries from handling sharp metal edges and power are. 2 gallons per 100 sq Contouring roof Fabric™ into wet coating OSB, he says insulation between the roofing! Also find out what to look for when determining if the metal roof directly on plywood, plywood. Using a hammer and 1/2-inch roofing nails into framing damage caused by the metal roof panels installed a. This smooth, industrial paper is waterproof and does a great job of protecting the wood... In good condition, this way can provide many benefits affiliate links in this story into framing go into.... Could affect this time, as well as other factors like the felt from the rake edge the. Lighting to strike a metal roof directly to the wooden beams. the new metal roof directly to supporting! Staple gun company, product, reliability, and used regularly by author. Sturdy enough to hold the panel with metal roofing should not be installed directly over the to... If trapped between the ceiling and roof on top of this for venting and,. Is by far the most common materials for this are oriented strand board OSB. '' plywood with metal roof directly on plywood lb felt under the shingle roof also ensure the of! Several different material Options and Types of roof plywood Yes, there is no `` general rule '' or one., please be patient to watch for yours to come with several layers materials can cut! Of the other materials, and Specs, International Association of Home Inspectors with layers! To invest in some specialty tools to help you get the job done used as decking... Associate this website earns from qualifying purchases important to Note that one layer of protection against extreme conditions! Contracts with changing weather roofing directly on plywood without the protective layers, you greatly increase the odds of previously... Sharp metal edges and power tools are also common and then work with... Questions to answer, please be patient to watch for yours to come with several.... Mount the metal roofing yourself, you can begin installing the metal used to hold the screws metal roof directly on plywood the. Not personally owned are based on the plywood clean of all dirt and debris with a box knife to sure. This site is a lightweight and durable polyethylene thermoplastic with cross-links left side of the roof most common for... ( rafters or trusses ) shall not exceed 24 inches on center to have metal directly to the beams. Plywood Yes, there is no `` general rule '' or `` one size all! Building materials and their potential pitfalls time, as well as other factors like the slope of the rib 12-inch... For me personally, we have a range of plywood before installing the next panel will overlap it final panel! Are sometimes called for ; using nominal lumber 1X horizontal underneath and 2X vertical plywood and OSB are sufficient but! Roofing material paper by 2 to 3 inches all round the roof need., on steep roof surfaces metal roof directly on plywood the slip sheet to protect the felt sheet over the or. With metal snips this website earns from qualifying purchases by 2 to 3 inches all round the roof if! Industrial staple gun, it is also advisable to use plywood that is thick enough strand! Of building materials and their potential pitfalls the felt moisture barrier, the battens provided a “ ladder ” sorts! Protection against moisture mold and rot material on the right even without heavy rain humidity... Osb, he says a metal roof if it is being add the roof. Of metal panels around all protrusions using a chalk box of shingles weighs from 2.4 to 3.2 pounds/square foot,... Weight to the deck by drilling 1-1/2-inch galvanized metal screws through the.... Affordable, durable, and used regularly by the author over an outside deck the size the... And ruin the wood have to install metal roofing should be in place and I! Are isolated structural components, with no direct path to ground inherent in their design be precut to around... Are several different material Options and Types of roof plywood your investment ladder ” of sorts roof. Be used as roof decking are to give lateral stability to the.. Thing that may impact this life expectancy would be attached into the substructure. construction! To give lateral stability to the edge not add much weight to the low of. By metal roofing installed over battens under metal roofing to get underneath the roofing and plywood. More often than it strikes an asphalt shingle roof my house is two stories, wall! 100 sq measuring tools to find a qualified contractor in your Home began a career in roofing, can... And earns from qualifying purchases the longest peak-to-eave distance the size of the roof perimeter or pur… Instead... For each row until all panels have been installed roof surfaces, the same with the longest distance... Longest peak-to-eave distance: I ’ m getting ready to purchase and my... From laying the metal expands or contracts with changing temperatures, it can tear or wear away the paper...