Another benefit to roof decking is its fire prevention properties. Builders started using plywood when it was invented because of its longevity and strength against splitting. There are two different types of sheet decking: plywood and OSB. In residential homes, its usually made out of wood, although there are also metal decking options available for flat roofs. The trusses and beams of the roof give the roof its initial pitch and structure and then the sheathing is applied so the actual underlayment and roof covering can be applied. Why is it important and how does it compare to roof sheathing? Manufacturers have their assemblies and roofing products tested using FM 4473 and UL 2218. Due to this, it would be best if you paid attention to the integrity and condition of your roof decking. Although some roofing contractors might use one term over the other, theyre essentially referring to the same roofing material. Some of thefacts they list are: Radiant-barrier sheathing emits 3%- 5% of the heat it absorbs and can reducesummer heat gain in the roof from 16 to 42%. 150% thicker- 225% stiffer, fewer creaks since we did this, walking on the roof feels like walking on a commercial building. Plywood comes in several different thicknesses (, , , and ) depending on the span of the rafters. Radiant barrier sheathing can only be retrofitted to existing homes when the roof is being replaced. Advantages of Investing in a New Roof Decking, Types of Roof Decking in Residential Homes. Builders began using this method because it has strength and longevity against splitting. While not as common as today, youll still find plank decking on older homes. Figure 3. After you have installed the shingles, the roof decking will support the whole weight of your roof. The roof deck will flex when walked on and youll often hear a cracking sound indicating the wood is breaking underneath your feet. It works by reflecting heat away from your home, which helps to keep your indoor temperature comfortable year-round. Instead, they have board layers placed under the shingles which were at an increased risk of leaks. Usually constructed of 4'x8 pieces of plywood or OSB, roof sheathing is critical for the roof's structural integrity and provides an uninterrupted surface for installing the outer roofing materials. Inspect your roofs shingles regularly so that you can repair loose, broken shingles as soon as you notice them to prevent them from causing bigger problems to your roofing structure. This code means that your roof decking (roof sheathing) must be able to withstand and hold your new roof when its installed. It was used on almost every new home built from the 70's on. One of these structures that work hard to keep your roof in good condition is the roof decking. Installing asphalt shingles over the open spaces between the 1" X 4"s, is not an option. If your house was built since the late to mid 70's, you probably have Plywood or Oriented Strand Board (OSB) also falsely called Wafer Board. Damaged roof decking can allow water and excess moisture to enter your home, which can lead to mold and mildew growth. A key piece of the stiffening system . Were here to help! Unfortunately, in 2021, wood prices are through the roof, which adds a pretty big expense to your roof investment if a lot has to be replaced. That said, it is nonetheless still one more layer of protection and stability for a roof, and an incredibly important part of the roofing process, as roof decking provides the foundation for all other protective membranes and materials like shingles, flashing, or membranes to be applied. The material chosen by your contractor will depend on different factors. The most important thing about steel is that it has high durability. There are a lot of technical terms used in the roofing industry. The major part of the brace system for your trusses/rafters. It's a popular choice for flooring, wall and roof sheathing, structural panels, and much more. 15/32-in x 4-ft x 10-ft Rated Douglas Fir Plywood Sheathing. It is what many refer to as "particle board" though this is not technically accurate. OSB material is cost-effective, easy to work with, and highly durable to resist bending. Robertson first pointed out that by design, nails are less brittle than screws, which leads to an increase in shear strength for nails. for pricing and availability. Generally, after two shingle roof replacements, the decking weakens from numerous nailings and should be replaced. Another advantage of steel roof decking is that it contributes to low energy costs. There is no technical difference between these two terms, although some roofing contractors prefer one over the other. This means that your new decking wont be properly attached to the roof surface, which will make it susceptible to damage, such as in the form of wind. Keep in mind that plenty of technical terms are commonly used in the roofing industry. Even though no all jurisdictions will require you to have a permit to roof your home, replacements or repairs should comply with the available building code. It protects the roof or attic from potential fires, as it is difficult to spread around. The decking on a roof is the surface that you walk on. As of 2021, if any of your plank decking has more than an 1/8 between the planks, your roof decking has to be replaced per the manufacturers installation instructions before roofing materials can be nailed on. Ask The Author Your Question In The Comments! If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. Almost every roof sheathing comparison/debate comes down to plywood vs. OSB. If you keep learning more about roofing, youll come across the terms roof sheathing and roof decking most of the time. You might notice some contractors prefer using one term over the other, but there's no big difference between the two. Tape is installed over deck sheathing joints and rollered to form good adhesion with the OSB sheathing. To learn more about Tufdek products or to speak with a vinyl decking expert, please call us toll free at 1-877-860-9333. While OSB is the most common, plywood is still very much used on homes today. A roof that is in a bad state has missing shingles, shingles starting to warp, and faded shingles. You might notice some common signs of a damaged roof deck in your home. Multiply the figure by 1.15 to factor in about 15% of waste. A local professional roofing company can help you assess the current roof decking condition and give valuable insights before deciding. 1/2" sheathing to span 32" instead of 28". Without it, your roof literally has nothing to stand on. According to code R905.2.1 of the 2018 International Residential Code: asphalt shingles shall be fastened to solidly sheathed decks. Section 1--Overview. it protects the underlying roofing structure from UV rays and weather damage, it provides a surface to install roof coverings like asphalt shingles or metal sheeting. We recommend that you replace your old wood roof decking with a more energy-efficient metal option. Lets look at more information about sheathing thickness: The most common types of wood applied in residential home roof sheathing are plywood and oriented strand board. It also establishes the least fire resistance of a roof assembly. If youre not sure whether or not your roof decking is bad, then its always a good idea to have a professional inspect it. It also creates a unique condition for the prevention of snow and ice-related damages. 125 Townpark Dr Suite 300. So, its hard to give a price on roof decking. It is an excellent value to consider if your property is located in hurricane-prone areas. o.c. It may require you to shell out on high upfront costs but the savings from the reduced energy bills and insurance discounts can help settle the payment. However, its usually not a good idea to do this. Water damage to thesheathing or decking on your roof can affect its structure, which can onlycause bigger and more expensive issues down the line if it goes unfixed. Common causes of roof deck warping include: There are several benefits of investing in a brand new roof decking, even when it isnt critical to replace. Your buildings roof decking should withstand the required wind loads of the area where your home is located. The terms roof decking and sheathing are often used interchangeably but one thing to keep in mind is how these terms refer to a similar process (crucial roofing element). For metal roofing systems, decking provides the added benefit of noise absorption, making the roof much . Lets explore them. This type of decking is usually found in houses that dont have ceilings. The old decking might not be attached properly, which could cause the new decking to come loose. Continue with Recommended Cookies. What's inside AdvanTech sheathing panels makes all the difference: Moisture-resistant resin technology resists the damaging effects of weather during construction, and a Structural 1 rating provides . Even within the categories of materials, there are still different varieties. Currently residing in Southwest Florida. Retired contractor. It's made up of wood chips/strips compressed together to form a flat 7/16" sheet. Roof decking is otherwise referred to as roof sheathing and forms the foundation of the roof. First, it dramatically improves the home's structural integrity. The difference is that the sheathing (or insulation) provides more protection against rain and snow. There are a few ways to tell if your roof decking is bad. If this is the case, then it will make sense to replace your decking at the same time as your roof. After a standard 2-hour soak test, DensDeck Prime Roof Board was 87% stronger than alternative mat face gypsum and 267% stronger than a gypsum fibre board. Most roofers simply prefer OSB unless the homes have heavy materials such as concrete or slate roofing materials. However, the design speed is lower throughout the rest of the country. Enter your search below and hit enter or click the search icon. After you strip the roof, do spot repairs to the existing sheathing where needed, then go right over it. The decking should be at least 19/32-inch thick. This way, the decking should be solid enough to withstand the roof loads without bending or falling apart. Wood Roof Shakes: Over solid or spaced sheathing, use 18 . the job. It is installed with the foil facing the attic and must have air space (minimum of ") in front of the foil to work and of course code required ventilation. Find My Store. Roof decking that will have metal for its outer roof covering is no different than sheathing a roof that will have asphalt shingles. The large your home, the more cost you will need to bear. However, roof decking does provide some degree of resistance to water penetration in addition to reducing cooling costs inside your home! If you arent of the local building codes, contact a professional to help you out. You'll want to use both longer sheathing nails and longer roofing . That said, it acts as a seal for your home. Before you remove shingles from your roof, it would be best to approach a professional roofing company to assess your roofs condition. The sheathing is the foundation of your roof, and its thickness has a great impact, not only on the durability but also on the moisture resistance and noise cancellation of the roof. Essentially, this sheathing provides a flat surface that adds a certain amount of stability to a roof, while also creating the first layer of defense from the elements. Uniform load deflection limitations 1 / 180 of span under live . The advantages of high-quality sheathing materials are many and hard to argue. It's a laminated sheet made up of compressed wood chips/strips that are 7/16 inches thick. What do you think will happen anytime you replace shingles? Roof decking or sheathing refers to the roof foundation. AKA, roof sheathing refers to where the shingles and other roof components are installed. The stronger the home's structure is, the better. Fiberboard products were also used for roof sheathing produced by several manufacturers and are still found on some homes in North America, often dating from the 1960s or early 1970s. o.c. I'm a licensed Home Inspector, Certified Master Inspector (CMI), and FHA 203k Consultant. Were here to help! Find My Store. Traditional oriented strand board (OSB) and plywood simply can't compare. Radiant barrier roof decking is an energy-efficient way to keep your home cool in the summer and warm in the winter. It just gets a little confusing sometimes when talking to different roofing contractors. Having a great roof and a beautifully painted home can improve your homes value and the resale price. in the field for supports at 48 in. By installing skip-sheathing as the roof deck, the spaces between the boards allow the wood shakes to breathe so that they dry more evenly after being soaked in the rain, limiting warping. The replacement costs for a roof decking that is 300 square feet is a range of $800 to $2,800. Using the purlins as the diaphragm element would lead to deflections and make the ceiling drywall the structural diaphragm element. The IRC and IBC require the construction of roof decking where there is a termination of certain fire-resistance walls at the underside of roof sheathing. Steel also wont warp or bend, so its resistant to various types of damage. Roof decking is made from either concrete, steel, or wood. Risk category involves the building or structure categorization depending on its use or occupancy. While plywood will cost you more, it is more robust and better suited for heavy roof covers (clay, concrete, or slate). It's installed directly on the roof deck and provides a secondary layer of protection from the elements, including rain, snow, and wind. However, if you dont know much about roof decking, it would be best to contact a professional to help you out. Homeowners ask, Are they the same thing? Do they each do something different? Does your roof need one or the other?. You should take the total square footage of your roof and then divide it by 32. However, there are several factors that you must consider while determining the perfect decking thickness for your roof. We and our partners use cookies to Store and/or access information on a device. OSB is widely used as roof decking material. As for plywood decking, it can be purchased in various thicknesses, and the one you choose will depend on the span of your roofs rafters. Common Types of Residential Roof Insulation for Toronto Homes, Understanding the Importance of Gutter Maintenance, The Hidden Costs of NOT Replacing Your Roof, The Benefits of a Metal Roof During Winter. Roof sheathing (aka roof decking) is a layer of material on top of a home's rafters that forms a solid roof deck. The answer varies on a case-to-case basis, depending on factors such as your homes current condition and roof age. Plywood or OSB Sheathing When it comes to plywood or OSB sheathing, you may have seen it before under the false term of Wafer Board. If installing new decking over old decking, your contractor may need to reinforce the rafters with additional bracing. The requirements are complex for houses developed as per the IBC and depend on the user group, wall rating, type of construction, and fire separation distance. Its resistant to hail and other harsh weather elements. Roofing hints: 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 . We hope that you have the best roof decking structures in your building. Do you have to change your roof sheathing as well? If your home is an area that experiences severe weather elements such as hail storms, steel roof materials can extend the roofs longevity by many years. This carries enough structural integrity for most roof loads. In residential roofing, a roofs sheathing is generally made from a layered wooden board (usually plywood or oriented strand board); however, it can be made from metal, concrete, or even cement depending on the home or how much weight the decking is needed to hold. hbspt.cta._relativeUrls=true;hbspt.cta.load(3406853, '831ce160-6e3d-47f0-bac8-d27c495e0c28', {"useNewLoader":"true","region":"na1"}); 2969 Armory Dr., Suite 300Nashville TN 37204. for pricing and availability. Roof sheathing--the material nailed to your trusses or rafters to which your roofing is attached--is your roof's workhorse. How Long Do SimpliSafe Camera Batteries Last? Roof decking is basically the foundation of your roof. A typical full roof replacement can cost you anywhere from $8,000 to $12,000. The biggest feature for CDX might actually be the homeowners' perception of higher quality. Other ways in which you can keep your roof decking in excellent condition is to follow these tips: There are some roofing code requirements homeowners should know when it comes to decking or sheathing. Its made up of wood chips/strips compressed together to form a flat 7/16 sheet. When this happens, you cant repair the decking as it will need to be replaced instead. Note that a plywood sheet thats 48 in size will cover approximately 32 square of the roof area. Asphalt shingles are now marketed to be weather-proof, but roof sheathing adds another protective layer to your home roof system. Your roof is made up of important structures and components that ensure it remains strong, durable, and can tolerate the harsh weather in your region while blocking out moisture. Doing so helps you make an informed decision in terms of necessary roof repairs and maintenance activities. Radiant barrier sheathing should only be used in cooling climate zones 1, 2, & 3. Roof decking secures the rafters location, thus ensuring that they sustain a proper spacing with time. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Here it would help if you focused on: Roof decking assemblies are rated as class C, B, A, or maybe non-rated, all of which depend on effectiveness against exposure to fire. (https://www.youtube.com/watch?v=UoYd99Pkwms), common signs of a damaged roof deck in your home, structure determines the integrity of your home, roof sheathing are plywood and oriented strand board, https://www.youtube.com/watch?v=eL5joBIPH50, The Code Game | How To Find Building Codes (https://www.youtube.com/watch?v=eL5joBIPH50), Drip Edge Flashing: What is it & Installation Guide, Do Gutter Guards Work on Metal Roofs: (Explained), A Guide To Gutter And House Drainage Distances: 7 Useful Options. Plank decking Plank decking was the main type of decking used before the invention of plywood. The roof deck is sealed by taping the sheathing joints with tape or membrane strips that are compatible with the plywood or OSB sheathing. In some instances, you might be able to install new roof decking over old roof decking. Some telling signs are faded or warped shingles, as well as missing ones. Model # 443736. (Related: Five Things Homeowners Should Know About Roof Sheathing Before Getting Their Roofs Replaced). Keep in mind that varies based on material costs and where you live. What Is Roofing Underlayment? Changing lightweight roofing or adding extra decking leads to an increase in a dead load of your home. Installation cost Apart from the product cost, you have to consider the installation cost. The roof sheathing is a structural diaphragm that distributes the various load on the building to the walls. Its made up of 26 boards that have a tongue on one end, hence its name, and then it gets fitted into a groove located on the edge of another board to create a proper fit and seal. Steel roof decking is the best decking option but the most expensive too.There are 3 materials used to make decking roofs for both commercial and residential roofing. Roof decking vs Roof Sheathing: What Are The Differences? What is the minimum thickness of roof sheathing? It is true more so in areas that experience various weather elements such as rain and hail storms. Theyll be able to tell you for sure whether or not it needs to be replaced. (4 Things to Know), 9 Materials Included With Your Roof Replacement. Concrete decking is basically a piece of concrete that seals off the top of the home. It is commonly affixed to the joints and trusses in the roof, AKA the most substantial beams, to protect the roof from damage (sag or bow) in the event of heavy snow or rainfalls. Roof decking also helps to seal your home against moisture and water damage, so you can see that it has to be strong enough to keep the entire roof structure solid and watertight. The roof decking building codes usually focus on roofing materials, installation, structural performance, and weather protection. `For instance, the nail patterns in high-wind locations require 8d nails with a maximum spacing of 6-inch. 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