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What Type Of Sheathing For Roof

What Are The Benefits Of New Roof Decking

How To Install OSB Roof Sheathing

Newly installed roof decking helps evenly distribute the entire weight of your roof. This can help reinforce your home to handle severe weather, the harsh Ottawa winters, and even falling branches from trees. New roof decking can also help protect your home against leaks or moisture buildups. The layer of sheathing provides additional protection and can be built from moisture and flame resistant materials. If youre updating your shingles or need a roof repair, its important to assess the quality of your roof decking. Contact us to get an inspection we can help with all your roofing needs in the Ottawa area.

We serve Ontario residents, particularly those of Ottawa, ON. Call Century Roofing and Siding today at 209-2662 to learn more about our services. We also offer eavestrough cleaning and installation.


How Much Does Marine Plywood Weigh

: Despite its name, this is not a waterproof plywood. It is manufactured using water-resistant adhesive and very high quality outer plies which help prevent moisture from penetrating the panel.

It is designed to be used where the material will be subjected to higher-than-normal amounts of moisture, such as in coastal environments.

A typical 4 x 8 sheet of 1/2-inch Marine Plywood weighs around 51 lbs.

How To Improve Osbs Insulation Against Water

Since being prone to moisture and swelling is one of the biggest drawbacks of using OSB, heres a quick guide to help you improve the boards level of insulation:

  • Cut the OSB sheets into the required sizes for the roofing process
  • Sand each piece lightly, coat it using a weather-resistant stain with a natural finish, or paint it latex or oil-based paint. You can also do both the staining and painting for further protection and improved aesthetics.
  • Allow the panels to dry, then coat each one with a layer of waterproof sealant on all sides.
  • Repeat as necessary and allow the wood to dry completely for 12 to 24 hours before using it for roof sheathing.
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    What Do Roofing Nails Look Like

    Galvanized roofing nails are steel nails that are zinc-coated. They hold up better against rust, and they can also be used for asphalt shingles. The length of the nail is the shank, and the shank can also vary. Screw shank nails are twisted and have sharp diamond tips, and they are used to securely fasten wood roofs .

    You Might Have To Replace Your Roof Decking During A Roof Replacement

    What is Roof Sheathing?

    When you get a roof replacement, you might have to replace your decking. If any of your roof deckings integrity is compromised or there are signs of rotting, the wood will need to be replaced.

    Usually, there are going to be a few boards that have to be changed out. But your roofing contractor wont know how much of your roof decking needs to be replaced until after they finish tearing off your old roof.

    If they find rotten boards, your roofing contractor has to replace the decking before they can begin installing your roofing components. However, if your contractor finds your deckings integrity to be sound, then it can handle your new asphalt roof.

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    Where To Put Vapour Barriers :

    “Materials that act as vapour barriers , including certain types of insulation, must be located within the assembly so that moisture moving from the inside to the outside does not condense and accumulate within the assembly. This means that vapour barriers should be located on the warm side of insulating materials.” – Canada Mortgage and Housing Corporation

    Manufacturers spec sheets we’ve read claim perm ratings of between 1 and 2 perms, but that doesn’t inspire a great amount of confidence given that that conclusion was obviously arrived at by using the most favourable of the available numbers. At least some of these panels are said to be perforated to allow for increased moisture permeability, but a close look at the panel in the photo above at least, shows no visible perforations. So if they are there, they are no bigger than a needle point.

    It would seem then possible at least, for moisture to migrate through the EPS and condense on the sheathing, certainly if you believe the lower of the OSB perm ratings. Without seeing the long term results of insulated sheathing products or at least some independent research on it, It’s hard to know what will happen.

    Do You Replace The Sheathing While Replacing Your Roof

    What do you think will happen anytime you replace shingles? Do you have to change your roof sheathing as well? It depends on the age of your roof and the condition of your house.

    Even though it isnt necessary to replace everything you replace your roof, several homeowners find it convenient to implement it. However, replacing your roof isnt inexpensive or convenient. The advantages of high-quality sheathing materials are many and hard to argue.

    Before you remove shingles from your roof, it would be best to approach a professional roofing company to assess your roofs condition. It can offer you some insight into the state of the decking materials on your roof. If you feel that you need a new roof, it would be time to call your favorite roofing company and schedule a proper inspection.

    Read Also: How To Extend A Metal Roof Overhang

    What Thickness Should Roof Sheathing Be

    The typical thickness of roof sheathing is about 7/16-inch, which is just under 1/2-inch.

    What is the best sheathing for a roof?

    The two most popular roof sheathing materials are OSB and plywood. Both of these are more economical than radiant barrier roof sheathing and zip system roof sheathing. Because of their affordability, most homeowners opt for one or the other. However, there is some debate as to which material is the best.

    What Even Is Roof Sheathing

    How Roof Sheathing Was Installed In The 1950s How It Was Built Years Ago

    Roof sheathing, also called decking or substrate, is a layer of wood paneling that supports the shingles, tiles or whatever roofing materials are on your roof. The sheathing is fastened to the roofs joists and trusses, and then the shingles are nailed down to the sheathing. Sheathing supports the rest of the roof and acts as a last line of protection from the elements. Because sheathing is a wooden product, it is subject to water damage and dry rot if kept in a humid environment. Replacing the sheathing on your roof can get expensive if there is extensive damage, so make sure to inspect your attic regularly to make sure things are dry and sound.

    If you have a tile or wood shake roof and are looking to replace it, you may have to get new plywood installed if you dont already have it. Oftentimes on those roof types there is a type of sheathing called skip-sheathing which many roofers will not install on top of.

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    What Is Roof Sheathing Made Out Of

    Roof Sheathing is usually made out of two types of wood, either plywood or OSB, which stands for oriented strand board.

    The difference between plywood and OSB is that plywood is a heavy material in comparison to OSB, which is a light material. With plywood being heavy, it can add to the weight of the roof, which isnt necessarily a good thing. Plywood is a lot more expensive to purchase than OSB, which is cheaper. However, the benefit of plywood is that it is very durable.

    The most used wood out of these two types is OSB because of it being cheaper and lighter.

    Types Of Roof Sheathing Examined

    Roof sheathing, also known as roof decking, is the surface that roofing materials attach to.

    These materials can be wood shakes or asphalt shingles. Roof sheathing is commonly made from materials such as:

    Each one of these materials have also been categorized as exposure or exterior grade in order to be used as sheathing.

    This also means that they are able to withstand any precipitation that may fall while the roof is under construction.

    However, it is important to note that there are some sheathing materials that are made from concrete and steel.

    Although not all roof sheathing is created the same, there are several different types that are currently being used in the construction industry.

    Concrete Sheathing

    This type of sheathing is used by roofing contractors when there is a need for high levels of strength and support for the roof.

    It is also used as fireproofing material.

    Concrete is also becoming a major material being used in eco-friendly and green buildings.

    Concrete sheathing is typically poured into several forms or set on a roof in a pre-cast board. When it is poured, it is reinforced with bars.

    Concrete sheathing is considered low maintenance because it is easy to clean, and it helps reduce the chances of the roof sustaining wind damage.

    Oriented Strand Board Decks

    OSB is a type ofRoof sheathingthat is quickly becoming the preferred option for roof sheathing.


    Wood Boards

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    Reflective Roof Sheathing For Cooler Home

    Reflective roof sheathing functions to provide better thermal protection for homes by reflecting the sun and preventing the attic from overheating.

    The attic is known to overheat during the summer because the suns energy is absorbed by the shingles and therefore transferred to the attic. This, in turn, causes the entire home to heat up more, leading to higher cooling needs and energy consumption.

    With reflective roof sheathing, on the other hand, the heat transfer from the shingles to the attic will be significantly decreased, leading to a cooler home, lower energy consumption, and reduced cooling costs.

    This can all be achieved simply by installing a radiant barrier on the sheathing. The radiant barrier will help make the home more energy-efficient, which is especially useful in hot climates or on buildings in such climates that may have less insulation.

    What Is A Pyramid Roof

    What You Need To Know about Roof Sheathing

    As you might guess, this is a type of roof that is shaped like a pyramid.

    A type of hip roof with no gables or vertical sides, pyramid roofs are usually used for smaller homes like cabins and bungalows, or sheds, garages, or other outbuildings.

    Pyramid roofs are popular in hurricane or windstorm prone areas, since they are extremely wind resistant.

    They also provide good ventilation and extra storage or attic space, or the interior can be left open for a high ceiling.

    The overhanging eaves of a pyramid roof help to improve energy efficiency as well.

    Note that pyramid roofs may be costlier to construct and maintain due to the complexity of the roof design, but they do provide the aforementioned advantages.

    They can be crafted from nearly any common roofing material including asphalt shingles, composite shingles, metal shingles, slate, clay or concrete tiles, or wooden shingles or shakes.

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    How Do You Know When Your Roof Needs Replacing

    There will be visible signs that your roof needs replacing, these I have listed below. If you do notice any of these problems, I advise that you get it sorted as soon as possible to prevent any severe damage. Be advised that sometimes you can have any issue with your roof, but it might not be so easy to notice.

    Fasten Roof Sheathing Panels Properly

    Fasten panels with a minimum of 8d Common nails spaced a maximum of 6 inches on center at supported panel ends and edges. At intermediate supports, fasten panels 12 inches on center. In high-wind areas, more fasteners may be required. Fasteners should be 3/8 inch from panel ends and 3/8 inch from panel edges .

    For pitched roofs, wear skid-resistant shoes.

    On panels with a screened surface or skid-resistant coating, install panels with the non-skid surface up.

    Read Also: How Much Is A Shingle Roof Per Square Foot

    What Is Roof Sheathing

    Roof sheathing, also known as roof decking, is a layer of plywood or OSB that covers the trusses and joists, which are the beams that make up the roofs skeleton shape.

    Roof sheathing goes above the roofs framework but below its shingles. That is because roofing shingles and tiles need a layer of support to rest on.

    The purpose of roof sheathing is to support the roofs structure by evenly distributing the weight of the shingles, instead of directly attaching them to trusses and joists.

    It also provides additional protection by adding an extra layer of insulation against leaks, slowing the spread of fires, and more.

    Usually, roof sheathing is made of wood. It can come in the form of plywood or oriented strand board . OSB is less expensive, but lighter and far more fragile, which is why many roofers rely on plywood.

    What Is A Skillion Roof

    How to Build a Shed – Sheathing The Roof – Video 10 of 15

    Also called a shed roof or a lean-to roof, skillion roofs are single-angled sloped roofs that can be attached to a taller wall or be an alternative to a flat roof for a stand-alone structure.

    Skillion roofs are common for additions to existing homes along with being a good choice for sheds and porches, but more contemporary style buildings may feature a skillion roof as a design statement.

    Skillion roofs have some significant advantages if your property is located in the mountains or northern midwest or New England, since their slope allows for quick snow and water runoff, which makes them ideal for regions that get heavy snow or rainfall.

    Skillion roofs tend to be a less expensive choice given their lack of complexity to build.

    Standing seam metal roofing is perhaps the best choice for a skillion roof, particularly since it allows for the installation of PV solar panels, which naturally increase the energy efficiency of the home.

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    Is Roof Sheathing Necessary

    Roof sheathing makes your roof strong, and that makes it necessary for almost any home construction. A building can only be complete when it has a roof over it, but a roof is not quality if it is not strong.

    The roofs structure is comprised of rafters and trusses of different sizes, e.g., 3×2, 4×2, and 6×2 wooden frames that are spaced on intervals of between 16 and 24 apart in both length and breadth.

    Most roofing materials come in the form of asphalt shingles or tiles, and because they are smaller in size and are laid nearby, the tiles wont have the base to apply on if the roof does not have a sheathing.

    But as much as homeowners only think of a roof sheath as the surface for holding shingles and laying out tiles on the roof, a roof sheathing has several benefits as an added advantage:

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  • Philip, It sounds, frankly, like you are in over your head.

    Similarly, you can’t specify the roof sheathing thickness by guessing. If you don’t know the answers to these questions, it’s time to hire an engineer, an architect, or both.

  • |#2

    I understand what you’re saying…those issues are a true concern and I may need to do so…get to an engineer/architect, but you’ve answered the question, giving me more information that I need, so many thanks, 6 in 12 slope, 6″ overhang, 16″OC. Now Rafter Span is a little more complicated. Once again, thank you for the answer. pt

  • |#3

    Lets pretend the roof design details are conventional and so the roof deck sheathing will be 5/8″ to 3/4″. Many metal roofing dealers specify minimum of 7/16″ sheathing.

    Design depends on type of metal roof: exposed or hidden fasteners board and batten panels shake and shingle panels panel or tile system standing seam etc. The system will be a consideration for dead load calculations although not much is heavier than asphalt, and that is the baseline for engineering calculations when using rafters, structural panels or wood-I’s .

    Metal should be installed using a cold roof design so the typical metal assembly would be: metal, air space of 3/4″ or greater using 1X4″ or 2X4″ purlins, WRB, and 5/8″ to 3/4″ of ply or OSB.

    Cross purlin designs with 16 OC are sometimes called for using nominal lumber 1X horizontal underneath and 2X vertical. All decent assemblies are screwed, not nailed.

  • Expert Member
  • Read Also: How Much Does A New Shingle Roof Cost

    Plywood For Roof Sheathing

    Roof sheathing or roof decking involves installing a layer of plywood or OSB to cover the joists and trusses, the beams that make up the skeleton structure of a roof.

    The sheathing is placed below the roofs shingles and above its framework. It provides the roofing tiles and shingles with a support layer to rest on.

    The purpose of sheathing is to:

    • Provide support as it prevents the direct attachment of shingles to joists and trusses by evenly distributing their weight shingles.
    • Provide extra protection by incorporating an additional layer of insulation to resist leaks and reduce the spread of fires.

    Roof sheathing is typically made out of wood, either plywood or OSB. While the latter is less expensive, its more fragile and lightweight, so many roofers go for plywood.

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    Roof Shingle Installation Hints:

    The Right Plywood for the Job
    • If using asphalt or fiberglass shingles, postpone shingle installation as long as possible. This will provide time for roof sheathing to adjust to humidity and moisture conditions.
    • For best appearance, use heavier weight shingles, or laminated or textured shingles. This will mask surface imperfections and reduce the risk of shingle ridging.

    This how-to article is part of the Builder Tips series of publications from APA – The Engineered Wood Association. View more helpful strategies, here.

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    Roof Types: All Roof Styles Explained

    by BarrettM | Feb 13, 2020 | Uncategorized |

    If you are like most of us, you probably dont think about the type of roof that you have until it needs to be repaired or even replaced.

    However, the type or style of roof that you have not only affects the aesthetic, or look and feel, of your house, it can also affect the overall value of the property.

    Whats more, the type of roof that you have can also make your home more energy-efficient, more weatherproof, and provide extra storage or even additional living space in the form of an attic.

    Do you know what type of roof you currently have or the details of the roofing system on the property you are considering purchasing?

    Are you planning on building a home, getting a new roof, or buying a new home anytime soon?

    Have you recently experienced a major weather event or a natural disaster like roof hail damage?

    All of these questions and more should be considered when you are considering buying a new property, building a home, or replacing and updating the roof on your home.

    There are also some other key factors to take into consideration do you want to allow for solar panels or similar energy-efficient or green features?

    Do you want the extra living or storage space that comes with a costlier mansard or gambrel roof, or would you prefer something more budget-friendly?

    What is the style of the existing property or what does the neighborhood look like ?

    Your new roof needs to be harmonious with its surroundings.


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