plywood overhang on roof

As a quick primer in plywood, each side is rated from A to D. A is smooth and knot-free while D, the lowest quality, has missing knots and cracks. The roof sheathing comes down and ends on top of the 1 x fascia. The ideal plywood thickness for the standard rafter spacing of 24 inches is 5/8 th of an inch. Be sure to nail the tar strip on each felt layer to ensure maximum hold. Rather than using batons, which other roofing materials use, Roof shingles are actually installed over a plywood deck. Comes in standard 4-by-8-foot sheets, is strong, durable, and relatively light. Just drop your top chords in the ends of the roof and use a double 3/4" screwed and glued. The plywood sheeting sits on 2x4's that were placed flat instead of on edge, which is … A good estimate for a contractor to do this same roof overhang extension would range from $50 to $85 per running foot. You would want to keep your completed overhang close to 1-1/2" if using gutter. Add the thickness of the true fascia, 15/16 in., in this case. Let’s say that your roof has a total of 1,500 square feet. The nails we use are specifically designed for this job, made to keep from pulling away from the rafters being nailed into. Joints must be made on the rafters just as wall sheathing joints must be made over the studs. measure from the edge of the plywood (outside of the wall) over to whatever the overhang will be and square a line up to indicate the end of the truss tail. This cost did not include any labor or waste disposal fees. This allows the 45% rule to be simply met with the following standard eaves overhangs: 450mm where height is 900–1200mm. So, dividing the area of the roof by 32 will give you the number of sheets needed. Aim for consistent sill heights where possible and consider extending the eaves overhang over full height doors or windows. When tongue-and-groove boards are used, joints may be made … Special metal plywood clips will add stability to the splices where the sheets meet between rafters. Consequently, how much overhang should a plywood roof have? 03-12-2003, 12:00 PM. Since the boards used for shiplap were manufactured here in the Pacific Northwest, it was still cheaper than plywood up through the 1960s. Make sure you have finished framing the overhangs. Plywood is a bit more expensive than OSB but is usually stronger. When replacing roofing, it is often necessary to cover spaced boards with a solid roof deck. It is at 45-3/4 in. Multiply that by 2 if you have a gable roof and that’s the total square footage of your roof. A typical 4 foot by 8 foot sheet of plywood covers 32 square feet. That’s right, just grab a sheet of shingles, give it a 180 turn, and your going to nail right in between the glue strip (the black shiny line across the shingle) and the chalk line. the roof above the overhang. If your home is one story, use extension ladders instead. The overhang is multiple meaning that the sheeting you would overhang some 3/4-1" followed by a drip edge then if using shingles another 1". Roof sheathing may also be constructed of plywood. 23/32 in. For the less standard 20-inch apart rafters, plywood with ½ inch or 5/8 th inch thickness … For many applications, a layer of plywood underneath your metal roofing is an unnecessary expense. Most builders overhang their roof plywood or OSB past the gable truss 12" and then nail a 2"x6" to the subroof to make their eaves. or Less Roof Fastening Zone Wind Main Sheathing-to-Gable- Overhang Velocity Roof End-Wall Framingg (eaves) (3-Second Panel 123 2 3 2 3 Once you repair the hole in the roof plywood, you need to seal up the seams and recover the roof. Fitting the roofing sheets (above right): Rafter Cavity Insulation – high-density spray polyurethane foam fills rafter cavity (2 … Divide the total roof area by 32 to get the number of sheets you will need to cover the roof. Cover the seams between the old and new decking with bitumen tape. Begin by measuring from your extended fascia to the peak of the shed. So this is the method I use, I make what my carpenter friend, who has forgotten more than I have ever learned about building calls "lookouts" to carry the plywood to extend the overhang. It will be a good idea to get an extra few sheets of plywood when ordering to allow for waste and off-cuts. The boards are not butted tightly; there is probably about a ¼" gap on average. Do the same for the other side. Use this measurement to cut a length of 2×4, making sure that one side of the board is miter cut to match the peak of the roof. My house is from 1950. When the panels are attached over the ... 3 Overhang 3 Overhang 3 Overhang 3 Overhang 3 Overhang 3 Overhang 2 Overhang 2 Overhang Roof Sheathing Materials Plywood. The overhangs ideally should help keep the coop dry because a well thought out coop has lots of 24/7 ventilation. Give your assistant one end of the chalk line and have him walk to the other edge of the area to remove. Determine which section of roof sheathing to remove, and build your scaffolding to that area. A roof that lays practically flat will have a much heavier load than a steeper roof that allows rain, snow, and ice to roll right off. Furthermore, what is the underside of a roof overhang called? Holding the roof together It makes sense to use nails to attach the decking, or sheathing, into place. This carries enough structural integrity for most roof loads. Until the 1940s, exterior grade plywood was not available. This plywood deck, which covers the entire roof, provides a … Snap a chalk line along the overhanging sheets along each side of the roof aligned with the edge of the last rafter, and trim off the excess sheathing with a circular saw. If you want to install trims to the end rafters, the roof decking should overhang about 3/4″. And nails have come through the plywood and show all over the attic and all the way around the soffit overhang on the outside.… Some are just the tips of nail that have come through the tongue and groove and some larger nails come through the trusses and have spilt the wood…My husband said this is normal, but it wasn’t that way before. Cut a piece of 1/2 inch plywood that will cover the area. ROOF SHEATHING FASTENING SCHEDULEa,b,c,d,e 8d Common (0.131 x 2-1/2 inches) or Ring-Shank (0.135 x 2-1/2 inches) (Except Where Noted) for Exposure B, Enclosed Buildings, Roof Framing Spaced 24 inches o.c. Then I do a metal drip edge to cover it all. Installing plywood on a roof is the most difficult place and depending on the slope of the roof can be more difficult than a lower sloped roof. Plywood roof sheathing exposed to the underside, such as eave overhangs is permitted to be of the interior type with exterior glue because of the decrease of exposure hazard relative to moisture and because the lower grade of inner piles will not adversely affect the glue-line performance. It withstands moisture well and grips nails tightly. 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 manufacturer's instructions and local building codes. However, 3/4 th inch plywood is also used for a roofing system that has a heavier load; snowfall and ice accumulation can affect the load put on a roof. Roof Sheathing Thickness. Unlike with plywood siding, the plywood sheet to be used for sheathing should be at least 3/8 inch thick. That’s considered to be the minimum. This minimum will only work if the rafters are set 16 inches apart at most and if the roof doesn’t have too much load. These pieces of plywood need something heavy duty to keep them from slipping off the roof. This can be done efficiently by cutting a panel in half and using these half sheets to start every other course. Make sure you give at least a 1/2” overhang over your plywood. Staple it to the roof decking or nail it with plastic-capped roofing nails. The roof is taller on the front where the people door is located, and slopes down toward the back, where the chicken door was installed. Taking the gable overhang into account when I lay out rafters minimizes cutting and wasting plywood. 1,500 ÷ 32 = 46.875 sheets. Provide a continuous 1x3 on the edge to form a straight line (the architect won't like the irregular and warping plywood edges)and to form a drip. How much does it cost to replace a roof on a 1500 square foot house? With a simple rake detail, accounting for the difference in rafter layout is easy math. Roofing Sheathing/Plywood Overhang, Fascia thickness Discussion in 'The BS Topic' started by mgd1790, Feb 19, 2017. • Improved fasteners such as ring shank nails increase the uplift resistance of the roof sheathing. x 4 ft. x 8 ft. RTD Sheathing Syp Plywood sheathing is ideal for residential Plywood sheathing is ideal for residential and light construction, and every piece meets the highest grading standards for strength and appearance. It also holds roofing nails well. Lay felt paper onto the roof, overlapping the existing paper to get good coverage. It adds proven performance and durability to … No other supports are put in place, so the only thing holding up the eave is the roof plywood, plus the fascia at the bottom of the eave. In order to get a professional result, we recommend you to use 3/4″ tongue and groove plywood sheets. Nailing Nail lumber roof sheathing to each rafter with two 8-penny (8d) nails. Sheathing Type Typically, 15/32-inch or thicker panels are required in high-wind areas. Stagger the joints of each course of sheathing. Roof shingles are installed differently from what we’re used to here in Australia. You can see that the edge of the sheathing is flush with the fascia. If you choose to use the first method (view A) to start the sheathing, measure the two end rafters the width of the plywood panel (48 inches). From the rafter tail ends, and using the chalk box, strike a line on the top edge of all the rafters. If you use the second method, The overhang is multiple meaning that the sheeting you would overhang some 3/4-1" followed by a drip edge then if using shingles another 1". When you and your assistant are on the roof, move to the end of the area to remove. Position the first piece of plywood or oriented-strand-board sheathing on the bottom edge of the rafter tails at one end of the roof. Align the long edge of the sheathing with the ends of the rafter tails, and the end of the sheathing opposite the edge of the roof centered on a rafter. Zone 4C. However, you may need to consider bolstering the plywood thickness for a roof that has a higher load. The overhang of the roof is minimal. Divide that by 32 (the square footage of each 4×8 plywood sheet). If your roof area is 1,600 square feet, 1,600 divided by 32 will mean you need about 50 sheets to cover the roof. Add an inch and a half for subfascia, strike a line. We build in Grand Rapids, MI. Next, place your piece of plywood and Styrofoam foam-side-up against the damaged roof decking. You would want to keep your completed overhang close to 1-1/2" if using gutter. Because driving nails up into the sheathing material will make things worse, glue a piece of 1-inch rigid Styrofoam to your piece of plywood. After cutting the sheets at the right size, you should fit them over the rafters and lock them into place with 2″ nails. Multiply the width and length of each slope and you should get the square footage of that slope. Sheathing is 1x8 shiplap boards (actual dimensions ¾x7¼, with ⅜x⅜ rabbets). at roof corners, edges, and ridge lines. Correspondingly, how much overhang should a plywood roof have? Shingle manufacturers say to use a 1/4- to 3/8-inch shingle overhang over the eave (where your roof ends). We've seen other references that suggest extending the shingles a bit more than the manufacturers suggest to compensate for wavy eaves, but they do not indicate extending more than 1 inch over the eave. If using metal w/o drip another 3/4-1" past the wood sheeting. For example, if your roof is 1,500 ft 2 then it will take 47 sheets of plywood to sheath it. Roof decks on homes built before 1970 are often 1×8 fir pre-plywood shiplap. Start by stapling the 6-inch starter strip at the bottom section of roof leaving a 1-inch overhang on the eave to ensure drainage into the gutters. In order to get a professional result, we recommend you to use 3/4″ tongue and groove plywood sheets. After cutting the sheets at the right size, you should fit them over the rafters and lock them into place with 2″ nails. If you want to install trims to the end rafters, the roof decking should overhang about 3/4″. Always Check for a Level Nailing Surface. In each of your shingle sheets, you want to use four of the roofing … Plywood is a standard roof decking product for porches. Roof is 1 layer of 3 tab asphalt shingles that are in need of replacement (it will be a full year off). If using metal w/o drip another 3/4-1" past the wood sheeting. APA Rated Sheathing panels, which include plywood and oriented strand board, may be used for this purpose. Going from bottom up, lay and nail the remaining felt layers with a 2-inch overlap. The cost of extending my 30 foot long roof overhang 14 inches was $340 or $11.50 per running foot for materials. Carefully work your way up to the peak of the roof. 4. Gable Overhang Construction. ... How far should Roof sheathing overhang fascia? 600mm for a height of 1200–1350mm. Once cut, check to make sure the two lengths of 2x4s meet uniformly at the roof … Plywood requires trees from old-growth forests. In this case, plywood should be a minimum of 3/8 inch thick. This can be done with a straight piece of lumber (6 feet … 3. Measure up the rafter 45-3/4 inch from the cut end of the truss tail and snap a line along the trusses. The common grade of plywood for roof sheathing is CDX.

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