– A popular technique for installing metal roofing over OSB is to make use of purlins. Install the metal roofing. Just wanted some clarification. OSB is incredibly more cost-efficient than plywood. There's a table in the installation guide. I have some sample two-square rolls of a good synthetic and would be happy to send you one or two if you pay the freight from Ohio. Now, I’m trying to decide between using 23/32 T&G OSB or 19/32 Structural Plywood as the decking material? For many applications, a layer of plywood underneath your metal roofing is an unnecessary expense. We have also been told it will be okay. 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. One option is to try some test fasteners in the OSB. Otherwise run your first panel flush with the rake edge of your roof and 1” over … For added durability, zinc metal smartroof can also be powder coated so that it’ll be virtually impenetrable, even in damp environments. A homeowner recently wrote and asked me the following regarding OSB roof decking: Q. – If you want to go for a really authentic look, you can actually use actual old-fashioned wooden boards as the purlins for your roof. ... we do install Tyvek under the purlins in case there is any condensation from outside air on the underside of the roof … He is president of Isaiah Industries, an organization recognized as one of the world’s leading metal roofing manufacturers. Not all decking is the same. All you’ll need to do is add the flashing and metal clips for the tops of the Osb modules. Then the top of all your purlins, once OSB under metal roof panels is placed … Most jurisdictions will require building permits for any structural changes, even when using asphalt shingles. Fabral makes metal roofing used by many installers and I followed their instructions when I built a small outbuilding using OSB decking for the roof. Unfortunately, if your old roof has damage, it will be necessary to remove the old roof and build a new one. Metal Roof .. OSB Problems . This particular contractor happens to admit to sheathing over 90 percent of all of the post frame buildings he has put up in 7/16” OSB (Oriented Strand Board) beneath the steel roofing … How To Repair Water Damaged Cabinet Doors, How to Install Laminate Flooring in a RV With Slip Outs. Use metal snips to cut flashing material. Is that true? Re: metal roofing screws into 7/16 OSB roof decking I think 5/8" is the minimum thickness that metal roofing needs to be applied over. I’d suggest a synthetic underlayment. In most cases, your house must meet building codes in order to install the metal. Always begin working at the point with the longest peak-to-eave distance. Your email address will not be published. … 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. You can easily install metal over old OSB with some simple changes to the existing framing. Todd Miller has spent his entire career in the metal building products manufacturing industry. Underlayment New underlayment must be immediately installed over prepared roof … TAMKO requires the fastening of every tile … 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. Synthetic underlayment is a roofing accessory created by weaving/spinning together polypropylene or polyethylene and a polymer to form an all-over protective barrier to put between the roofing material and the roof deck. Learn how your comment data is processed. The key is to drill and tap the holes for the screws, then place the metal over the roof material. OSB is widely used as roof decking material. Provide a 1/8-inch … Yes, you should use some sort of underlayment. Take your first sheet of metal and place it on the roof so that it overhangs the … That's common for metal roofing; … Score the edge of the roof with the blade and begin splitting the asphalt into strips that will form the purlins. If you get 45 or more pounds of pull out resistance, that’s considered acceptable for most applications. You may pull quotes from this article provided you include a link back to the original article on this site. Install the flashing and metal clips and, if you’re satisfied with the results, clip the entire thing together. Posts: 148. How to Replace a Mobile Home Bathroom Exhaust Fan, How To Install Ceiling Fans With Attic Access, How to Install Wall Ovens in a Base Cabinet, How to Rewire a House Without Removing Drywall, Ceiling Glass Design Ideas For Bathroom Looks More Stylish, Wool Mattress: Why It is the Best Option for Organic Bedding Enthusiasts, 4 Reasons Why You Need A New Commercial Roof, How to Choose Right Blogs for Guest Posting, Best Memory Foam Pillow Detailed Reviews 2019 – Top Picks, Fast Video Downloading With YouTube To MP4 Converter, Watch Movies Online – Find Out How With MovieRulz. April 3, 2017 | Filed under: Metal Roofing, Roofing Answers, Roofing Installation, Roofing Materials. Secure each strip with asphalt screw and nail. Todd Miller 8510 Industry Park Drive Piqua, OH 45356 (937) 773-9840 ©2009 – 2021 AskToddMiller.com Site Maintained by StoryRidge Marketing. You may have just voided any warranty that came with the metal by putting it over … Need help finding a local, quality metal roofing contractor or supplier? We heard that the metal will not stay on as well if you have OSB roof decking. Here are three suggestions for installing metal roofing over of: – Using standard metal roof installation techniques, you can install corrugated metal roofing nails in a variety of configurations and sizes. You may not reprint this full article, or even a significant amount of the article, without explicit permission. Roof leaks, of course … but also improper attic ventilation can cause condensation in the roof deck that can cause the OSB to weaken. I've just had 24 guage standing seam metal roof with hidden fasteners installed on an A-Frame cabin. So, what would expose it to moisture? Please write for us if you have something related to home improvement tip share with the community. In addition, zinc metal smartroof doesn’t get slippery when wet, so you won’t end up getting run over if things get wet. … Installing the metal roof panel depends on the type of metal roof product you have, but start at the edge and make sure your first panel overlaps the existing edging by an inch, if applicable. Align the first metal roofing panel so that it overlaps the edging by 1/2 to 3/4 of an inch and is square to the roof line. Purlins are a strip of metal that resemble small strips of paper. Also pull out force depends on your design wind speed and can be improved by increasing the diameter of the screws. Allow for a minimum of 18 inches (46 cm) if you need to lap to complete the run. Synthetic underlayment is a newer innovation that is taking over the metal roofing … This roof is mounted on new 7/16 OSB with 30 pnd felt, over 2 inch polyiso … Through his website, he strives to raise the bar on standards and practices to provide property owners with the best possible products for successful roofing projects. Home | Roofing Information | Is OSB Acceptable as Roof Decking for Metal Roofing? In the case of zinc metal smartroof building contractors recommended metal roofs, they are definitely worth it. Plus, by incorporating metal rakes and granule products into the roof’s design, you can make the roof more energy efficient, protecting your investment for years to come. If interested, email me at todd@asktoddmiller.com Should you ever get condensation on the back of the metal panels (unlikely but still possible(, it will quickly mess up the OSB if the OSB is not protected by underlayment. NYC Locksmith Jet That Makes Car Keys Or Access Keys? Ensure roof trusses are in proper alignment with no curves or uneven sections when installing OSB … – A popular technique for installing metal roofing over OSB is to make use of purlins. Comparing plywood and OSB If you’re not a handyman, though, you may opt instead to purchase a kit that comes with pre-fabricated wooden boards that snap together easily. To gain permission, click here. Install OSB Panels on Aligned Roof Trusses. Your email address will not be published. Do not do anything that might later void the wind warranty they offer. Metal roofing is more durable and cost effective than asphalt shingles. This means you don’t have to buy expensive metal flashing to complete the job. A. OSB in good condition will have every similar fastener pull-out resistance to CDX plywood. Add the metal panels. A solid deck originally meant dimensional lumber … Unfortunately, if your old roof has damage, it will be necessary to remove the old roof and build a new one. 5Install Metal Panels or Shingles. Metal roofing panels rated for "architectural use" attached to purlins (horizontal pieces of wood or metal fastened to roofing trusses) are structurally sound when installed according to your roofing … However, before installing metal roofing over OSB, there are some important decisions to be made. Case in point – one of our recent clients in Colorado has hired a building contractor to erect his building. Install metal flashing along the edge of the roof using a hammer and 1/2-inch roofing nails. The minimum OSB panel size is 24 inches in any direction and each sheet end must rest on a rafter. To create these purlins, all you need is regular home building hardware and a razor blade. A potentially easier option is to use purlins (on top of the rafters) rather than framing between the rafters. You’ll need to drill pilot holes for the screws and metal flashing, so choose a spot on your roof that will provide adequate headroom. I will install proper vents to circulate the air from the front crawlspace up thru the ridge vent , I am also installing a new metal roof , so my question is : do i need to install over battens , so there is airspace under the metal roof as well as the proper vents below the sub roof , or should I install the metal roof … Oriented Strand Board, commonly referred to as OSB, is a type of engineered lumber similar to particle board, formed by adding adhesives and then compressing layers of wood strands. If you’ve ever seen a real haunted house, you know what these purlins look like – dark, ominous, and definitely haunting. If you have less than that or a lack of ventilation that threatens ongoing performance, I’d replace the decking. So, when you’re considering whether you need to install metal over OSB, consider whether the extra expense will be worth it for the added safety, durability and quality of the roof. I’m sheeting the rafters with osb than tin. 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”. Always pay attention to the thickness of the boards, and work accordingly with your materials. 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. If you are considering installing metal roofing over OSB, it is an excellent decision. You need to make sure the metal … Good luck! We are checking into a metal roof and we have a question that needs to be clarified. Tags: fastener pull-out resistance, OSB, OSB roof decking, Im building a play house for my grandkids. The other option for installing metal roofing calls for a “solid deck” to be in place and then the roofing is attached to it. – Another good technique for installing metal roofing over OSB in an area that’s really windy is to cover the whole thing with zinc metal smartroof. April 3, 2017 | Filed under: Metal Roofing, Roofing Answers, Roofing Installation, Roofing Materials Oriented Strand Board, commonly referred to as OSB, is a type of … Customers are choosing OSB to be installed as their roof decking because it can lower the cost of their overall roof installation. Another option for installing a metal roof over shingles requires first laying a vapor barrier pound felt followed by the Grandrib 3 panels. The key is to drill and tap the holes for the screws, then place the metal over the roof material. Voro is most trusted home improvement blog where contributors contribute to spread the knowledge & help others. Is OSB Acceptable as Roof Decking for Metal Roofing? You can easily install metal over old OSB with some simple changes to the existing framing. Todd is currently Vice President of the MRA (Metal Roofing Association) and a Past Chair of MCA (Metal Construction Association). All this said … always adhere to what your roofing manufacturer says. Your email address will not be published. Metal roofing screws need to go into framing. This means you may have to seek approval from your local authority. Most panels come up to 32 feet (9.8 m) in length. roof framing and decking abnormalities will be transferred to the new metal roof if not corrected before sheeting begins. Location: South Central Idaho. You need to set the Username and the UserID. Oriented strand board, or OSB roof sheathing, is a preferred material for roofing, because of its strength and low weight.Avoid the errors described when installing this roof sheathing. You’ll need to drill pilot holes for the screws and metal flashing, so choose a spot on your roof that will provide adequate headroom. OSB, exterior gypsum *Before installing TW Metal and Tile Underlayment under copper roofing, Fasteners and batten strips must be used when installing tiles over TW Metal and Tile. Step 1, Cut the panels to the desired length. Should I use felt between osb and tin. 1) Remove the Shingles before Installing the Metal Roof The first way to install a metal roof over shingles is by completely removing the old shingles before installing the new … I have seen far fewer problems with moisture absorption and rot with it compared to OSB. However, if using this method, you’ll need to be sure to work with fasteners that are long enough to reach through the plywood or OSB… Be sure the larger edge is laid so that the … I can help. This material is designed to be stronger than asphalt, which makes it ideal for use in areas prone to hurricanes or heavy rains. Once you have located your building permit, it is time to determine which design will work best for your house. Before you can install the metal roofing over the protected plywood, there are a few more considerations. Lay sheets in rows with the long edge horizontal to the roof bottom. Find a copy of the install instructions from the manufacturer and follow those (if you still can). This approach offers superior weather protection as well as improved durability than was once thought, but still affords the benefits of metal over asphalt shingles without the disadvantages. With the use of specialized metal roof coatings, such as Silver Sable, you can add a layer of protection that lasts longer than shingles alone. The problem, though, is that OSB tends to deteriorate fairly rapidly if exposed to moisture, losing fastener pull-out resistance. Measure the length of the roof edge with a tape measure. This site uses Akismet to reduce spam. My preference is plywood. To begin, you should determine whether you need to replace old roofing or repair the old one. Sounds like a great project! To begin, you should determine whether you need to replace old roofing or repair the old one. Required fields are marked *. If an open-grid framed roof or widely spaced old- solid roofing planks as the "sheathing", it is important to tightly stretch this so it does not sag down and hold water between the framing / roof sheathing boards and the metal roofing … Should it be a different type of wood? In rows with the longest peak-to-eave distance require building permits for any structural changes, even when asphalt. And asked me the following regarding OSB roof decking: Q the entire thing together a metal and., before installing metal roofing over the protected plywood, there are important... The Username and the UserID entire career in the Case installing metal roofing over osb zinc metal smartroof building contractors metal... 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