Roof Waste Calculation

Accurately Calculating Roof Waste

10% for all gable roofs, 15% for all hip roofs

If you’re a Roofing Contractor and have worked with insurance claims, you’ve heard this before. You also know how ridiculous this is. Would anyone believe the waste factor for the two roofs below could be the same? However, most insurance adjusters will attempt to pay 10% for both without any factual data to support that approach. What can you do to stop this practice?

roof waste calc sheet
roof waste calculation

Cap and Starter are bundled into the field shingles calculation and are part of waste

This is another ridiculous myth propagated by the insurance companies as it allows them to underpay the roofing claims. 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. Below is the description from Xactimate for what is included in RFG 240 (3 tab 25-year composition shingles). Where is there any mention of cap and starter? 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. Dump fees, haul off, disposal and labor to remove the materials previously on the roof are covered by the remove portion of RFG 240.

rfg 240

It’s really difficult to estimate complex roofs accurately
Accurately ordering materials is a pain in the xxxx.

Multi-level, complex roofs are difficult to estimate. Note the word large wasn’t included. That’s because it is the smaller, cut up hip roofs that can often have the highest waste percentage. A 7.5% variance of waste on a 30 square roof would be 2.33 squares. That’s $500 to $600 variance on the estimate. It could be the difference between winning and losing the bid. Why flip a coin or guess at the accurate estimate for materials when there is a tool available to provide you with accurate numbers?

Roof Waste Calculation Workbook

This workbook takes into account all waste factors for 3 tab composition and architectural laminated shingles. 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. 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.

There are 3 pages in this workbook that deal with the math. 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, eaves, rakes, hips, ridges, sidewalls and end walls. 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.

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.

Roof Waste Calculation Demo Video

Results of the Roof Calculation Worksheet – It Works

We have been using a simpler form of this worksheet for over 5 years. It has worked. In fact, is has been very effective. !00%? No, are you kidding? There are no 100 percenters in this business. I would conservatively estimate this worksheet has helped us get 300 squares and more per year approved every year we’ve used it. That’s a minimum of 1,500 squares. Do the math though. That’s in the range of $300,000 total we’ve added to our jobs. Each company or person’s success and amounts will vary dependent upon the volume of roofs you replace each year and your individual capabilities in adjuster meetings and with supplementing. We are finally seeing a slight increase in insurance companies paying for cap and starter as separate line items. This can make a HUGE difference in the job price.

Download for Free

This workbook is free to download and use as often as you wish. In fact, please do. If enough competent roofing contractors across the country start presenting this worksheet and demand Adjusters pay for the correct amount of materials, we all will gain. Imagine actually getting paid for the amount of materials that are actually required for the roof replacement.

I only ask 2 things. First, fill out the form below and hit submit. I will send you the roof waste calculation worksheet within 24 hours. Second, instead of passing this to fellow roofers, please direct them here to submit their request. It is possible, if not likely, that I will make updates and improve this workbook over time. By having people submit a formal request, I can contact people regarding these updates as they occur over time.

I suppose for legal purposes, even though it is being given away, I need to state a couple of caveats.

  1. We do not guarantee or warrant the accuracy of the roof waste calculation workbook. 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..
  2. We make no guarantees or warrant the success you will achieve when using this in debates with adjusters and the insurance companies. The worksheet provides you with actual, mathematical data and supporting arguments. Your success rate will also depend on your ability to present and discuss these facts.
  3. You must have Excel Version 2010 or later to run this file.

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  1. I waive Exact Roofs LLC from any legal obligations for my own, or my company’s, utilization of the Roof Waste Calculation Worksheet.
  2. I agree to maintain this file for my individual utilization and will not distribute it to other users.

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