Rake Edge. Calculate roof waste by a set percentage. Apply extra-heavy (typically 43-pound) roofing felt over the sheathing, old roof, or the insulation. One 4-by-8-foot sheet of OSB or plywood is 32 square feet. In fact, is has been very effective. Answered by LCD: Check out the prior comments in Home > Roofing for normal asphalt shingle replacement cost. It’s also my opinion that less than 10% of the requesters end up investing an adequate amount of time (which is minimal) to learn to properly utilize the workbook. Calculate the price of your roof replacement. Contact your Member Contractor/Installer for more details about your particular job; unfortunately this is not a question that the CSSB can answer for you as it is project-specific. February 5, 2018 / Posted in: The Ol' Sage Builder. Roof pitch affects the actual area of the roof. Would anyone believe the waste factor for the two roofs below could be the same? For sheathing work a lower grade called CDX is usually used. The calculation is based on that the Plywood or OSB (Oriented Strand Board) sheets are of a 4' x 8' size. Battens Over Solid Sheathing Improve Wood Roof Venting. Accurately ordering materials is a pain in the xxxx. Another factor determining sheathing thickness is the prevailing weather. Valley. Why flip a coin or guess at the accurate estimate for materials when there is a tool available to provide you with accurate numbers? Additional cost for damaged sheets of plywood, assuming the underlying rafters or trusses are not rotted too (normally are not significantly damaged unless the plywood is literally fallin gapart), generally about $40-70/sheet installed unless you have 3/4" exterior sheathing… Dump fees, haul off, disposal and labor to remove the materials previously on the roof are covered by the remove portion of RFG 240. Remember, you always want to plan for waste and surprises so that your costs do not exceed what you bid and so that you don’t have to buy more shingles while you’re on the job. Once the area is known, divide by the area of a 4×8 sheet to find how much sheathing is needed. That may not seem like a lot, but when you are that close to the danger zone, a 24% difference in … 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. EXACOR™ MgO panels install in less steps, in less time and with less mess — all while offering fire protection and sound dampening. You always want to make sure the rough side is up with OSB sheathing. If you intend to actually use it, you’ll pay back your $200 investment hundreds if not thousands of times over with increased payments from the insurance scopes of loss. What can you do to stop this practice? A 12 in 12 roof can cost up to 50% more than a 4 in 12 roof. It’s really difficult to estimate complex roofs accurately Weyerhaeuser 9' x4' Panel have vertical nail lines at 16" and 24" centers which speeds up the process for an easier installation. To find the amount of plywood needed to cover a roof start by finding the area of the roof. I have received well over 1,000 requests for the Roof Waste Calc Workbook since establishing this page. The amount of waste on a Hip roof will be higher than for sheathing a Gable roof and even more so if you are using OSB sheathing. Download The Slope Chart PDF. ... you can consult the following chart to discover the slope factor and hip & valley factor. A strong, resilient roof is a home’s first line of defense when the roof deck is exposed to weather. The only roof that will generate no waste from cutting is that rare simple gable whose roof length is divisible by the 3-ft. length of a shingle. When outfitting your residential or commercial structure with products from Everlast Roofing, it’s important to know the incline, or pitch, of your roof. That’s because it is the smaller, cut up hip roofs that can often have the highest waste percentage. Below is the description from Xactimate for what is included in RFG 240 (3 tab 25-year composition shingles). Structural Sheathing. Find the Area of a Roof. Andrew Hudson: "Is there a formula for figuring the waste factor of ..." - Waste factor formula (9/22/2006) within the Standing Seam roof discussion of the residential metal roofing … The waste calculation workbook accounts for the valley underlayer, valley trim, rake trim cuts, sidewall and end wall trim cuts as well as a factor for accounting for crew error and handling waste along with roof penetrations. The worksheet provides you with actual, mathematical data and supporting arguments. I would conservatively estimate this worksheet has helped us get 300 squares and more per year approved every year we’ve used it. 2.1b Fastener Uplift - Roof Sheathing Ring Shank Nail - 5/8" WSP (2018 NDS Only) 82 2.1c Fastener Uplift - Roof Sheathing Ring Shank Nail - 7/16" WSP (2018 NDS Only) 84 2.2 Common Nail Lateral - Single Shear Wood-to-wood86 2.3 Withdrawal - Lag Screw 91 2.4 Wood Screw Lateral - Double Shear Wood-to-wood93 You also know how ridiculous this is. It could be the difference between winning and losing the bid. Other simple … That’s $500 to $600 variance on the estimate. Asphalt Roofing Solutions 101 Asphalt is one of the oldest roofing technologies still in use today and it is a reliable solution for both residential and commercial roofing needs. Waste factor — The only roof that will generate no waste from cutting is that rare simple gable whose roof length is divisible by the 3-ft. length of a shingle. To find the amount of plywood needed to cover a roof start by finding the area of the roof. It’s best to plan your order using the same waste factor that you would use for three-tab shingles—at worst you’ll just have a couple of bundles to return.For a simple roof, I generally figure 1 percent as a waste factor. In areas where there are heavy ice and snow loads, thicker sheathing is required. Material Costs. Roof waste is automatically calculated based on seven factors. Weyerhaeuser OSB 9' x4' wall sheathing panels are engineered specifically to provide you with even faster installation and less waste at the jobsite. It comes in 4- by 8-foot sheets in a variety of thicknesses, grades, and qualities. Roofs are framed with rafters or trusses, which are rafters joined by internal braces so they install as a single component. In other words, since it has been free, people get it and then do nothing with it which is a waste of their time and mine. thicker the sheathing required. Find out how many bundles of roof covering (Felt, Shingles, Etc.) Where is there any mention of cap and starter? Note the word large wasn’t included. enter the length of the building in feet and inches. The Norbord experts, in collaboration with APA representatives, offer a solution for roofing panels which are lifting slightly. HVAC Insulation Duct Board Duct Liner External Duct Insulation Flexible Duct Insulation Accessories The Source - Insulation Intel. Cap and Starter are bundled into the field shingles calculation and are part of waste. We do not guarantee or warrant the accuracy of the roof waste calculation workbook. The Ten most Important Fasteners for Installing Roof Sheathing. Valley. By submitting the form below, I agree to the following: "Honest and professional. Headwall / Appron Flashing. This can make a HUGE difference in the job price. First, the accuracy is highly dependent upon the data entered into it and experience shows there is as much as 5% variance in measurements, roof reports, etc.. We make no guarantees or warrant the success you will achieve when using this in debates with adjusters and the insurance companies. Eaves. After laying down No. thicker the sheathing required. Insulating foam sheathings are split into two basic categories: 1) thermoplastics, 2) Eaves. It affects walkability as well as drainage, and roofs in areas of high rain or snowfall tend to have steeper pitches. When outfitting your residential or commercial structure with products from Everlast Roofing, it’s important to know the incline, or pitch, of your roof. The amount of waste on a Hip roof will be higher than for sheathing a Gable roof and even more so if you are using OSB sheathing. NOTE-- This waste factor is reasonable for remodeling and smaller projects. Both materials are made of wood, but OSB is more lightweight and costs slightly less. Finally, you have to consider allowable dead and live roof loads established by calculations and tests. Material Costs. Total Roof Area (in sq ft. without waste) Predominant Roof Pitch (Example 6/12) # Squares 1 story # Squares 2 story. Many Insurance Adjusters would have you believe everything but the kitchen sink is bundled into this line item when in fact, it simply covers the shingles, 15 lb felt, roofing nails and installation labor. Please read the following legal disclaimer prior to requesting the Waste Calc Sheet and donating the $200. That would give this roof 25.6 squares (20.48 x 1.25 = 25.6). I waive Exact Roofs LLC from any legal obligations for my own, or my company’s, utilization of the Roof Waste Calculation Worksheet. 10% for all gable roofs, 15% for all hip roofs. 888-339-0059. OSB sheathing has a rough side and a smooth side. That’s because it is the smaller, cut up hip roofs that can often have the highest waste percentage. If you wish to receive a copy, please fill out the form below and then click on the Donate key to donate $100 via Paypal. This provides the full benefit of spaced sheathing on top of a solid roof deck. This is because a steep-sloped roof requires a taller chimney and more lumber for framing. From there, the waste factor increases with every obstruction, such as a chimney, and with every hip or valley. Step Flashing Hip Cap. Roof Measurements (Leave field blank if value is zero) Type of Shingle. Ridge Cap. In areas where there are heavy ice and snow loads, thicker sheathing is required. Let’s take a closer look at the Authentic Restoration roof wast calculation worksheet. Rake Edge. Due to the amount of time it requires for me to send out the file and to answer the number of unsolicited phone calls I frequently receive, the Roof Waste Calc Worksheet will no longer be a free download. You do not need to have a Paypal account to make this donation, you can use a credit card in the Paypal app to make the payment. Each company or person’s success and amounts will vary depending upon the volume of roofs you replace each year and your individual capabilities in adjuster meetings and with supplementing. It has worked. Multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof in square feet. Another factor determining sheathing thickness is the prevailing weather. If you’re a Roofing Contractor and have worked with insurance claims, you’ve heard this before. That’s a minimum of 1,500 squares. One sheet covers 32 square feet, with 10% waste factor. Roof Measurements (Leave field blank if value is zero) Type of Shingle. Download The Slope Chart PDF. Plywood is very durable but tends to cost a bit more and is heavier. That’s in the range of $300,000 total in roofing cost we’ve added to our jobs. You should be prepared to have about 15 percent waste, so multiply your figure by 1.15. ZIP System roof assembly combines our revolutionary integrated sheathing and flashing tape or liquid flashing to provide a sealed roof for protection against moisture intrusion during construction or if high winds strip the roof covering away. Multi-level, complex roofs are difficult to estimate. A new roof costs $4,000 to $10,000 on average and varies on the shingle material used and several factors. Remember, you always want to plan for waste and surprises so that your costs do not exceed what you bid and so that you don’t have to buy more shingles while you’re on the job. Waste factor will vary, depending upon quality of product, roofing contractor’s experience, and aesthetic look desired. There are no 100 percenters in this business. Other simple gable roofs will require cut shingles at the rakes. One sheet covers 32 square feet, with 10% waste factor. If someone is suffering financial hardship to the point they cannot afford the fee, just email me and I will provide it at no charge as long as you are committed to using it. We figure that a carpenter can install about 77 square feet of plywood sheathing per hour, with a little help from an unskilled worker. Find the Area of a Roof. Never install the OSB sheathing with the smooth slippery side up! Determine waste factors, gable heights and materials for vertical rises and rafters. At just 2 minutes each handling time to respond to each request, that is 33 hours spent just sending out the workbook over the past 18 months. Add a roof to the Sketch, and add an applicable roofing item to the estimate. Step Six: Round up to 26. We have been using a simpler form of this worksheet for over 5 years. Don’t be intimidated, all that is required to use this work-book is to fill in blanks for roof area and the lengths for valley, leaves, rakes, hips, ridges, sidewalls and end walls. 30 felt underlayment, install vertical 2x battens lined up with the rafters beneath for solid nailing. The numbers in the Bundles/SQ list denote the upward rounding factor of the bundle (1/3”–1/8”). Once the area is known, divide by the area of a 4×8 sheet to find how much sheathing is needed. Step Flashing waste factor in a percentage preset @ 10%. If you are calculating the number of sheets needed for a Hip roof then for the value of the gable overhang use the eaves overhang dimension, assuming it is the same all around. A roof pitch multiplier, also called a roof pitch factor, is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof. Roof pitch is a determining factor for cost of the roof, as well as the roof area, and the type of materials used. This will give you the total number of sheets to buy. Roof pitch is a determining factor for cost of the roof, as well as the roof area, and the type of materials used. One sheet = 32 ft². However, most insurance adjusters will attempt to pay 10% for both without any factual data to support that approach. You may want to reduce it to 5% for new construction, where there is less cutting loss. This provides the full benefit of spaced sheathing on top of a solid roof deck. If you are calculating the number of sheets needed for a Hip roof then for the value of the gable overhang use the eaves overhang dimension, assuming it is the same all around. Roof sheathing is usually made of either oriented strand board (OSB) or plywood. ... but smaller cutoffs will be waste. All Rights Reserved | Privacy | Terms | Roof Waste Calculator, The Best Alternative to Metal Shake Roof Shingles, A Better Alternative to Vinyl Cedar Shakes. We figure that a carpenter can install about 77 square feet of plywood sheathing per hour, with a little help from an unskilled worker. Estimate the amount of plywood or OSB needed for sheathing a roof. Copyright - 2021 Authentic Restoration LLC. Total Roof Area (in sq ft. without waste) Predominant Roof Pitch (Example 6/12) # Squares 1 story # Squares 2 story. Do the math though. The Roof Waste Calculation Tool takes the guesswork out of estimating sketched roofs and provides an accurate and consistent method for calculating the amount of roofing material required for waste. 2 perm 7/16 OSB sheathing with a 30 perm WRB results in 1.88 perms. Plywood is one of the most common roof sheathing materials in use today. *This download requires a $200 donation via Paypal. That doesn’t count all the unsolicited support request calls. Promises made became promises delivered. Add 10 percent to allow for waste. Thank you. Waste is minimal, contributing to the low in-place cost. Step Six: Round up to 26. So just order one bundle for each sheet of roof sheathing. For roof slopes expressed as “X-in-12” (rise-in-run), the roof pitch multiplier is determined by finding the square root of ((rise/run)² + 1) . The Minimum Plywood for Roofing. One square foot of roof sheathing area. However, the end result may be well worth it as your roofing material is estimated to last up to 50% longer and will require less maintenance. This is another ridiculous myth propagated by the insurance companies as it allows them to underpay the roofing claims. We are finally seeing a slight increase in insurance companies paying for cap and starter as separate line items. Labor Costs. Finally, you have to consider allowable dead and live roof loads established by calculations and tests. More than me making money off this, the $200 is intended to at least minimize the number of people requesting the workbook to those who are committed to using it. Take the roof's total square footage and divide by 32. ", “They were clean, prompt, organized and on time.". Multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof … Hip Cap. Headwall / Appron Flashing. That would give this roof 25.6 squares (20.48 x 1.25 = 25.6). 757-963-6878 Virginia Class a builder lic# 2705158280. The square footage of a Hip roof area is identical to the square footage of a Gable roof of the same measurements. On a complex roof with open valleys, I add 5 percent and sometimes more. ... you can consult the following chart to discover the slope factor and hip & valley factor. Your success rate will also depend on your ability to present and discuss these facts. A 12 in 12 roof can cost up to 50% more than a 4 in 12 roof. Waste factor will vary, depending upon quality of product, roofing contractor’s experience, and aesthetic look desired. There are 3 pages in this workbook that deal with the math. building width, the "gable side" wall in feet and inches, waste factor in a percentage preset @ 10%, number of sheets needed based on exact square footage of the roof, the number of sheets the waste percentage will add, Number of sheets needed including the waste. Sheathing The Sheathing tab displays a plan view of the corner of the main roof and the hip end roof viewed at an angle perpedicular to the plane of the roof and showing all dimensions and angles necessary to calculate and cut the required sheathing. Drive cap nails 6 to 8 inches apart in rows along the top and bottom of the sheets, as well as in a row in the middle. needed for your home. In the Waste list, select the percentage of roof waste to apply. Financing now available to qualified customers. The remainder of the 3 pages explains the math for the insurance adjuster when they insist “10% for all gables, 15% for all hips” is their method of estimation. This workbook takes into account all waste factors for 3 tab composition and architectural laminated shingles. 2 perm 7/16 OSB sheathing with a 5 perm WRB results in 1.43 perms. !00%? There are 6 additional pages that explain other aspects of estimating such as (1) Valley underlayer; (2) Why hip/ridge cap must be paid as a separate line item; (3) Why stater course must be paid as a separate line item; (4) Exhibits of Xactimate™ roof sketches that mathematically prove why 10% for all gables and 15% for all hips absolutely is inaccurate; and (5) A poll exhibit from expert roofers showing that insurance estimates are near always short on materials. Plan for waste factor. However, the end result may be well worth it as your roofing material is estimated to last up to 50% longer and will require less maintenance. The Roof Waste Calculation Tool takes the guesswork out of estimating sketched roofs and provides an accurate and consistent method for calculating the amount of roofing material required for waste. I agree to maintain this file for my individual utilization and will not distribute it to other users. eaves overhang in inches. Learn about the variety of installation methods and roofing system options including BUR (Built-Up Roof… You must have Excel Version 2010 or later to run this file. 30 felt underlayment, install vertical 2x battens lined up with the rafters beneath for solid nailing. There is a separate workbook for both of these shingles types as there is a slight difference in the math for a couple of the trim cuts. After laying down No. Battens Over Solid Sheathing Improve Wood Roof Venting. A 7.5% variance of waste on a 30 square roof would be 2.33 squares. This is because a steep-sloped roof requires a taller chimney and more lumber for framing. All fasteners are critical. It affects walkability as well as drainage, and roofs in areas of high rain or snowfall tend to have steeper pitches. No, are you kidding? A close look at the cost breakdown for field shingles, ridge cap and starter course shows that the labor rate for cap and starter is well over 2 x more than the labor rate for field shingles. Roof pitch affects the actual area of the roof. 888-339-0059. pitch of the roof rise in 12". On the Quick Entry pad, click Item Property Editor to open the Item Property Editor dialog box. Roof waste is automatically calculated based on seven factors. Mechanical Insulation ... Roofing Components Roofing Insulation and Cover Boards Adhesives, Cements, and Primers Specialty Roofing Products Fasteners and Plates Coatings. the width in feet and inches. Ridge Cap. Contact your Member Contractor/Installer for more details about your particular job; unfortunately this is not a question that the CSSB can answer for you as it is project-specific. This basically calculates the number of sheets needed for a Gable roof.
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