Add 10 percent to allow for waste. 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. Roof pitch is a determining factor for cost of the roof, as well as the roof area, and the type of materials used. One 4-by-8-foot sheet of OSB or plywood is 32 square feet. Another factor determining sheathing thickness is the prevailing weather. 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. In fact, is has been very effective. Download The Slope Chart PDF. 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. NOTE-- This waste factor is reasonable for remodeling and smaller projects. Valley. 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. For sheathing work a lower grade called CDX is usually used. 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. On a complex roof with open valleys, I add 5 percent and sometimes more. That’s because it is the smaller, cut up hip roofs that can often have the highest waste percentage. After laying down No. All Rights Reserved | Privacy | Terms | Roof Waste Calculator, The Best Alternative to Metal Shake Roof Shingles, A Better Alternative to Vinyl Cedar Shakes. Waste factor will vary, depending upon quality of product, roofing contractor’s experience, and aesthetic look desired. By submitting the form below, I agree to the following: "Honest and professional. It could be the difference between winning and losing the bid. Roof waste is automatically calculated based on seven factors. Promises made became promises delivered. 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. Note the word large wasn’t included. 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. Eaves. So just order one bundle for each sheet of roof 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. Both materials are made of wood, but OSB is more lightweight and costs slightly less. 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. Hip Cap. 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. 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). Determine waste factors, gable heights and materials for vertical rises and rafters. HVAC Insulation Duct Board Duct Liner External Duct Insulation Flexible Duct Insulation Accessories The Source - Insulation Intel. Structural Sheathing. Apply extra-heavy (typically 43-pound) roofing felt over the sheathing, old roof, or the insulation. We figure that a carpenter can install about 77 square feet of plywood sheathing per hour, with a little help from an unskilled worker. Mechanical Insulation ... Roofing Components Roofing Insulation and Cover Boards Adhesives, Cements, and Primers Specialty Roofing Products Fasteners and Plates Coatings. 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. 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. We figure that a carpenter can install about 77 square feet of plywood sheathing per hour, with a little help from an unskilled worker. Roof Measurements (Leave field blank if value is zero) Type of Shingle. 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. The worksheet provides you with actual, mathematical data and supporting arguments. 30 felt underlayment, install vertical 2x battens lined up with the rafters beneath for solid nailing. 2 perm 7/16 OSB sheathing with a 5 perm WRB results in 1.43 perms. ... you can consult the following chart to discover the slope factor and hip & valley factor. Roof pitch affects the actual area of the roof. Add a roof to the Sketch, and add an applicable roofing item to the estimate. Thank you. 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 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. 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. Rake Edge. It affects walkability as well as drainage, and roofs in areas of high rain or snowfall tend to have steeper pitches. Waste is minimal, contributing to the low in-place cost. I waive Exact Roofs LLC from any legal obligations for my own, or my company’s, utilization of the Roof Waste Calculation Worksheet. Never install the OSB sheathing with the smooth slippery side up! Headwall / Appron Flashing. In the Waste list, select the percentage of roof waste to apply. You must have Excel Version 2010 or later to run this file. Labor Costs. I agree to maintain this file for my individual utilization and will not distribute it to other users. Material Costs. Roof waste is automatically calculated based on seven factors. One sheet = 32 ft². Once the area is known, divide by the area of a 4×8 sheet to find how much sheathing is needed. All fasteners are critical. You also know how ridiculous this is. This provides the full benefit of spaced sheathing on top of a solid roof deck. 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. Battens Over Solid Sheathing Improve Wood Roof Venting. 30 felt underlayment, install vertical 2x battens lined up with the rafters beneath for solid nailing. Find the Area of a Roof. It affects walkability as well as drainage, and roofs in areas of high rain or snowfall tend to have steeper pitches. 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. ... 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. 10% for all gable roofs, 15% for all hip roofs. Roof Measurements (Leave field blank if value is zero) Type of Shingle. *This download requires a $200 donation via Paypal. 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. 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. 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. Step Flashing ... but smaller cutoffs will be waste. 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… 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. Find the Area of a Roof. Material Costs. To find the amount of plywood needed to cover a roof start by finding the area of the roof. Roof sheathing is usually made of either oriented strand board (OSB) or plywood. Where is there any mention of cap and starter? Plywood is very durable but tends to cost a bit more and is heavier. Finally, you have to consider allowable dead and live roof loads established by calculations and tests. Calculate the price of your roof replacement. 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. There are no 100 percenters in this business. Take the roof's total square footage and divide by 32. No, are you kidding? Copyright - 2021 Authentic Restoration LLC. If you’re a Roofing Contractor and have worked with insurance claims, you’ve heard this before. OSB sheathing has a rough side and a smooth side. 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. One square foot of roof sheathing area. thicker the sheathing required. That would give this roof 25.6 squares (20.48 x 1.25 = 25.6). Multi-level, complex roofs are difficult to estimate. Eaves. 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. pitch of the roof rise in 12". Download The Slope Chart PDF. 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. Cap and Starter are bundled into the field shingles calculation and are part of waste. You may want to reduce it to 5% for new construction, where there is less cutting loss. needed for your home. 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. Another factor determining sheathing thickness is the prevailing weather. I would conservatively estimate this worksheet has helped us get 300 squares and more per year approved every year we’ve used it. One sheet covers 32 square feet, with 10% waste factor. 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. It comes in 4- by 8-foot sheets in a variety of thicknesses, grades, and qualities. This can make a HUGE difference in the job price. Below is the description from Xactimate for what is included in RFG 240 (3 tab 25-year composition shingles). It’s really difficult to estimate complex roofs accurately That’s a minimum of 1,500 squares. That’s in the range of $300,000 total in roofing cost we’ve added to our jobs. 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. Total Roof Area (in sq ft. without waste) Predominant Roof Pitch (Example 6/12) # Squares 1 story # Squares 2 story. When outfitting your residential or commercial structure with products from Everlast Roofing, it’s important to know the incline, or pitch, of your roof. A 12 in 12 roof can cost up to 50% more than a 4 in 12 roof. Would anyone believe the waste factor for the two roofs below could be the same? eaves overhang in inches. Step Six: Round up to 26. Roof pitch affects the actual area of the roof. 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. Total Roof Area (in sq ft. without waste) Predominant Roof Pitch (Example 6/12) # Squares 1 story # Squares 2 story. !00%? 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. Learn about the variety of installation methods and roofing system options including BUR (Built-Up Roof… Step Flashing Headwall / Appron Flashing. A strong, resilient roof is a home’s first line of defense when the roof deck is exposed to weather. Answered by LCD: Check out the prior comments in Home > Roofing for normal asphalt shingle replacement cost. That doesn’t count all the unsolicited support request calls. This is because a steep-sloped roof requires a taller chimney and more lumber for framing. Rake Edge. That’s $500 to $600 variance on the estimate. You should be prepared to have about 15 percent waste, so multiply your figure by 1.15. Dump fees, haul off, disposal and labor to remove the materials previously on the roof are covered by the remove portion of RFG 240. Roof pitch is a determining factor for cost of the roof, as well as the roof area, and the type of materials used. 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. enter the length of the building in feet and inches. This provides the full benefit of spaced sheathing on top of a solid roof deck. There are 3 pages in this workbook that deal with the math. What can you do to stop this practice? 888-339-0059. Step Six: Round up to 26. 888-339-0059. The numbers in the Bundles/SQ list denote the upward rounding factor of the bundle (1/3”–1/8”). On the Quick Entry pad, click Item Property Editor to open the Item Property Editor dialog box. 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. Plywood is one of the most common roof sheathing materials in use today. Plan for waste factor. We do not guarantee or warrant the accuracy of the roof waste calculation workbook. The square footage of a Hip roof area is identical to the square footage of a Gable roof of the same measurements. This is because a steep-sloped roof requires a taller chimney and more lumber for framing. Once the area is known, divide by the area of a 4×8 sheet to find how much sheathing is needed. The calculation is based on that the Plywood or OSB (Oriented Strand Board) sheets are of a 4' x 8' size. Find out how many bundles of roof covering (Felt, Shingles, Etc.) Weyerhaeuser 9' x4' Panel have vertical nail lines at 16" and 24" centers which speeds up the process for an easier installation. From there, the waste factor increases with every obstruction, such as a chimney, and with every hip or valley. Ridge Cap. One sheet covers 32 square feet, with 10% waste factor. 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. Financing now available to qualified customers. waste factor in a percentage preset @ 10%. 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. Other simple gable roofs will require cut shingles at the rakes. It has worked. That’s because it is the smaller, cut up hip roofs that can often have the highest waste percentage. After laying down No. Insulating foam sheathings are split into two basic categories: 1) thermoplastics, 2) We have been using a simpler form of this worksheet for over 5 years. Other simple … 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. We are finally seeing a slight increase in insurance companies paying for cap and starter as separate line items. 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. Weyerhaeuser OSB 9' x4' wall sheathing panels are engineered specifically to provide you with even faster installation and less waste at the jobsite. That may not seem like a lot, but when you are that close to the danger zone, a 24% difference in … thicker the sheathing required. To find the amount of plywood needed to cover a roof start by finding the area of the roof. Hip Cap. ", “They were clean, prompt, organized and on time.". 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. 2 perm 7/16 OSB sheathing with a 30 perm WRB results in 1.88 perms. the width in feet and inches. Finally, you have to consider allowable dead and live roof loads established by calculations and tests. 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. However, most insurance adjusters will attempt to pay 10% for both without any factual data to support that approach. This is another ridiculous myth propagated by the insurance companies as it allows them to underpay the roofing claims. 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. 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. This will give you the total number of sheets to buy. Calculate roof waste by a set percentage. Battens Over Solid Sheathing Improve Wood Roof Venting. February 5, 2018 / Posted in: The Ol' Sage Builder. Do the math though. 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) . 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. A 12 in 12 roof can cost up to 50% more than a 4 in 12 roof. Estimate the amount of plywood or OSB needed for sheathing a roof. The Minimum Plywood for Roofing. Roofs are framed with rafters or trusses, which are rafters joined by internal braces so they install as a single component. Valley. 757-963-6878 Virginia Class a builder lic# 2705158280. This workbook takes into account all waste factors for 3 tab composition and architectural laminated shingles. Let’s take a closer look at the Authentic Restoration roof wast calculation worksheet. In areas where there are heavy ice and snow loads, thicker sheathing is required. Accurately ordering materials is a pain in the xxxx. Waste factor will vary, depending upon quality of product, roofing contractor’s experience, and aesthetic look desired. Multiply the length of the roof in feet by the width of the roof in feet to find the area of the roof … This basically calculates the number of sheets needed for a Gable roof. 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. 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 … Ridge Cap. A new roof costs $4,000 to $10,000 on average and varies on the shingle material used and several factors. In areas where there are heavy ice and snow loads, thicker sheathing is required. 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 Ten most Important Fasteners for Installing Roof Sheathing. The Norbord experts, in collaboration with APA representatives, offer a solution for roofing panels which are lifting slightly. I have received well over 1,000 requests for the Roof Waste Calc Workbook since establishing this page. Why flip a coin or guess at the accurate estimate for materials when there is a tool available to provide you with accurate numbers? A 7.5% variance of waste on a 30 square roof would be 2.33 squares.