roof blueprint

Diy Metal Roofs

The good news is that there are many different solutions in terms of installing metal roofing panels, including tin, aluminum and steel. As well, homeowners can choose from an array of colors, textures and styles.

The most popular material is steel, which is superior in terms of function and performance but is slightly more expensive.

If you are thinking about how to install a metal roof, you will first need to gather together all the necessary supplies, remove your old roof, and then install a layer of insulation and the new roof.

Of course, the big advantage of choosing a DIY metal roofing material over composition or wood is what you get in return – vastly superior life expectancy and durability. On most applications, a metal roof will last the life of the building – DIY it once and you’re done! It’s certainly something to keep in mind when planning your project. I’ve spoken with people who rejected all of the benefits of a metal roof as a DIY project because they determined it would take a few more days to install (compared to a composition shingle). While this is undoubtedly true for most jobs, does a few extra days of work now not make up for decades of improved service down the road? Taking the long view puts things into perspective quickly and for people looking for long-term performance and value for their roofing dollar, metal has to be the first choice every time.

DIY Metal Roofing Resources

  • See available metal roofing materials, styles, and colors.
  • See examples of DIY metal roofing installations done by our customers.
  • Get instant online pricing that includes shipping (within the lower 48 states).
  • You as a purchaser have toll free access to our superlative Customer Service Personnel who can help you out with any question you may have.

How To Install Metal Roofing On A Shed

 

Installation Related Resources

  • We have compiled a page of the best tools that we recommend to make the job go smooth and easy!
  • Determining your roof’s pitch.
  • Measuring a roof for materials pricing and installation.
  • Metal roof terms glossary.

Measure the Roof

  • Use measuring tools to find the length and width of the roof from the ground outside.
  • Figure out the slope of the roof by setting a carpenter’s level on the underside of one rafter in the attic. Measure the vertical distance (rise) from the 12-inch mark on the level (run) to the underside of the same rafter. 
  • Slope is calculated as rise over run. For example, if the vertical height was 6 inches, your slope would be 6:12, or 6/12 or 0.5, expressed as a decimal.
  • Multiply the area by the slope. The result is the total square footage in your roofing project.
  • Order roofing supplies by the square footage and add 10 percent more for waste.
  • Be sure to order your roofing screws at the same time as your metal roofing panels so that you’ll match the colors.

Metal Roof Installation in Allen, TX

Materials and Tools you will need

* Sheet metal hand seamer aka folder or crimping tool.
* Drill/Driver
* Wood cutting: For minor wood repairs, a cordless reciprocating saw.
* Hammer, rubber mullet, tool belt, metal snips/shears, tape measure.
* Safety rope, anchor and harness, and knowledge/experience using it, work safety plan, and first aid kit.
* Safe to use and adequate Ladder.
* Tear off/roof stripping tools, heavy duty contractor bags, and a dumpster to dispose of old shingles.
* Pre-measured and pre-cut Standing Seam Metal panels at work site.
* System specific screws and flashing details for your roof.
* Roofing Underlayment, Ice and Water, nails with colored caps.

If you’d like to learn more about the feasibility of completing a DIY metal roof project, call or contact us today. We’ll be happy to answer all of your questions, and we can recommend the best material and profile for your project.

roof quotes online

Aerial Roof

Sky Roof Measure provides accurate 3D satellite roof measurements, aerial roof measurements, roofing reports for U.S. Canada roofers companies, insurance adjusters, and more.

Clear Benefits

  • High-Resolution overhead imagery
  • Option to measure from images by season/month 
  • 70% of all U.S. properties captured
  • Seamlessly integrated into roof measurement software
  • Frequently updated image database
  • Alternative when satellite imagery is obscured
  • Enhances roof inspection reports for insurance purposes
  • No need to purchase 3rd-party roof measurement reports

Progressive roofing companies often use a blend of technologies these days. They might combine their standard practices with aerial measurement services to captures aerial views from 15°-45° (a.k.a., “oblique”) angles and top-down (or “orthogonal”) perspectives. Or they might purchase roof-measurement reports or decide to deploy deploys drones to provide visual information.

2D & 3D Modelling | VECTIV

All that is fine—provided the roof of your target customer isn’t obscured by trees, limiting your prospecting to a relatively small area and resulting in inaccurate measurements. As you might imagine, many reports are not based on leaf-off imagery, the best satellite maps lack detail, and drones are typically flown on demand, regardless of foliage conditions.

Unfortunately, roofers have tight windows of opportunity to operate. They can become busiest right after a hurricane, a tornado, a hailstorm, or heavy snow coupled with high winds. Your lines may be flooded with calls from damage-sustaining households across a wide area. Even in good conditions, roofing companies are required to continuously prospect, estimate and quote with detailed measurements as they compete for business, one street and neighborhood after another.

In a highly competitive business, roofers need every edge they can get. Prospective customers want accurate repair quotes—and they want them quickly. So why wouldn’t you choose a tool that can give them both and, at the same time, enable you to accelerate your business?

High-resolution aerial imagery, captured multiple times per year offering leaf-on and leaf-off views, gives roofers exceptional perspective and a distinct advantage over many competitors. If that information can be instantly accessed from any laptop, mobile or connected device, all the better.

 

Measuring Steep Roofs

A-frame roofs and even gable roofs can be relatively steep. Measuring a very steep roof involves different computing techniques. To measure steep roofs, the roof length needs to be calculated first. Then external walls are computed plus the overhang for the length of the residence lateral to the ridge. After that, a cable is lobbed over the ridge to identify it on each eave of the steep roof. This allows you to tally the overall width dimension to use in estimating area. This is done on each roof section that has a horizontal ridge.

Why Roofing is a Dangerous Job - Snow Basinski Foundation

What Tools Are Needed to Measure A Roof?

The tools needed to measure a roof are relatively simple and straightforward. Generally, all one needs to measure a roof are the following:

  • Measuring Tape
  • Ladder
  • Calculator
  • Pen/pencil
  • Paper
  • Level

If you have those tools on hand, you should be able to discern a crude estimate of your roof’s square footage, pitch, and overall slope.

Should I Measure My Own Roof?

While you can try to measure a roof on your own, it is a job best left up to a quality roofing team who knows what they’re doing. Not only will they quickly and accurately measure your roof with ease, but they can do so safely. Safety is paramount in Northern Florida where weather and conditions can quickly take a turn. Measuring your own roof if you lack experience could lead to additional costs if you underestimate or overestimate the number of materials needed to complete the work.

Measure a roof safely

Without the proper training and equipment, it isn’t recommended for homeowners to climb on their roofs.  If you want to get the project started yourself, opt for the safer alternative that will save you time and keep you safe by ordering an aerial roof measurement report.   

 

Aerial measurement

Measure My Roof

To do this, measure the length and width of each plane on the roof, including dormers. Then, multiply length x width to get the square footage of each plane. Finally, calculate your roof’s total square footage by simply adding the square footage of each of the planes together.

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How to Determine Your Roof Pitch

The next step is to measure the pitch (also referred to as the roof slope) of the roof deck. You’ll need to figure out the vertical distance (also known as the rise) over a 12” horizontal segment (also known as the run). Record these values as roof rise over run, with the vertical measurement listed first and the horizontal second.

It’s important to keep in mind that the roof pitch will be dramatically different for homes with a flat roof than homes with a steep roof.

Roof pitch affects the actual area of the roof. Depending whether the roof area is measured horizontally (possibly from a drawing or photograph), a correction factor is necessary to determine the actual area of the roof. Given pitch and a horizontal area measurement, multiply the horizontal area by a correction factor corresponding to pitch, provided in the table below, to determine the actual area of the roof to be used in the Roofing Material Calculator. While it is possible to estimate the amount of necessary materials using only the total roof area measurement, as can be seen from the table, depending how large the pitch of the roof, the actual area of the roof can differ by up to 2.236 from the measured total area at a pitch of 24/12. As such, while it can be cumbersome, measuring the area and pitch of each part of the roof and multiplying by the corresponding correction factor will result in the most accurate estimate of necessary roofing materials.

Roofing Leads Case Study - 300+ Exclusive Leads/mo.

Typical Slope Correction Factors:

PitchAngleMultiply By PitchAngleMultiply By
1/124.8°1.003 2/129.5°1.014
3/1214.0°1.0314/1218.4°1.054
5/1222.6°1.0836/1226.6°1.118
7/1230.3°1.1588/1233.7°1.202
9/1236.9°1.25010/1239.8°1.302
11/1242.5°1.35712/1245.0°1.414
13/1247.3°1.47414/1249.4°1.537
15/1251.3°1.60116/1253.1°1.667
17/1254.8°1.73418/1256.3°1.803
19/1257.7°1.87320/1259.0°1.944
21/1260.3°2.01622/1261.4°2.088
23/1262.4°2.16224/1263.4°2.236

Welcome to the All Seasons Metal Roofing of Central Virginia - All Seasons Metal Roofing of Central Virginia

CALCULATING THE AREA 

If you want to get the exact area measurement for your roof, you can follow these steps:

  1. Once you have your roof’s pitch, divide the number by 12. (For example, if your roof’s pitch is 4 in 12, you would divide 4 by 12. This would yield 1/3.)
  2. Next, square your result. (If your number is 1/3, squared would yield 1/9.)
  3. After that, add 1 to your number. (1/9 + 1 = 10/9.)
  4. Next, figure out the square root of your new number. (The square root of 10/9 is 1.05.)
  5. Next, use your measuring tape to measure the length of your house. (Be sure to include overhangs.)
  6. After that, measure the width of your house. (Be sure to include overhangs.)
  7. Multiply your house length by your house width to get the area. (For example, 40 feet x 30 feet = 1,200 square feet.)
  8. Next, multiply the area by your roof’s pitch. (1,200 x 1.05 = 1,260 square feet.)
  9. To allow for hips, ridges, and waste, add 10% of your final number for a gable roof and 17% of your final number for a cottage roof. (Your total number would be either 1,386 or 1,474 square feet.)
 
 
rooftop measurements

Roof Measuring

How do I calculate the size of my roof?

Multiply your house length by your house width to get the area. (For example, 40 feet x 30 feet = 1,200 square feet.) Next, multiply the area by your roof’s pitch. (1,200 x 1.05 = 1,260 square feet.)
 
Can you measure a roof from the ground?
 
If you’re planning work on a roof and don’t have the building plans, taking preliminary measurements from the ground allows you to approximate the roof area and estimate some costs. … But, you can measure a gable or flat roof from the ground with the help of an assistant.
How Big is a Square in Roofing? Measuring for Shingles (Square Feet)

How to Manually Measure a Roof

To manually measure a roof without the help of aerial measurement reports, you must visit a job site and climb onto the roof to take precise roof measurements by hand.

  1. Measure the width and length of each plane of the roof (including dormers), and then multiply those numbers to get the correct figure for the square footage of that area.
  2. Note any skylights, chimneys or other parts of the roof that would not require materials so you can subtract those measurements from your total area.
  3. Add together the calculated square footage of each surface to get the figure for total square footage of the roof.
  4. After determining the total square footage of the roof, you must calculate the pitch of the roof by measuring the vertical distance (rise) over a 12 inch horizontal segment (run).
  5. Write down these numbers as the vertical measurement listed first and the horizontal measurement recorded second so you can find rise over run.
  6. When you have the total square footage and rise over run of the roof, you can calculate the roof squares to determine how much materials are needed to cover the roof. To calculate the number of squares on a roof, you need to divide its total square feet by 100.
 

WHAT YOU’LL NEED TO CALCULATE ROOF AREA: 

  • Ladder
  • Large level
  • Measuring tape
  • Marker
  • Pencil, paper

How to Measure Roof Size - Roofers - TalkLocal Blog — Talk Local Blog

MEASURING THE PITCH

To calculate the area of your roof, first you’ll need to calculate the pitch of it:

  1. First, use your measuring tape to measure 12 inches on your large level and make a mark at the 12-inch line.
  2. Next, place your ladder against your house at the gable end.
  3. Climb to the top of your roof.
  4. After that, place your level against the gable trim and flat against the side of the house.
  5. Using your measuring tape, measure from the 12-inch mark on your level up to the bottom edge of your gable trim. This number is your rise.
  6. Each rise measurement is written as “# in 12” and this is your roof’s pitch. (For example, if your rise is 4 inches, your roof’s pitch is 4 in 12.)

McNabb Edward Roofing | New Roofing | Chatsworth | Home

CALCULATING THE AREA 

If you want to get the exact area measurement for your roof, you can follow these steps:

  1. Once you have your roof’s pitch, divide the number by 12. (For example, if your roof’s pitch is 4 in 12, you would divide 4 by 12. This would yield 1/3.)
  2. Next, square your result. (If your number is 1/3, squared would yield 1/9.)
  3. After that, add 1 to your number. (1/9 + 1 = 10/9.)
  4. Next, figure out the square root of your new number. (The square root of 10/9 is 1.05.)
  5. Next, use your measuring tape to measure the length of your house. (Be sure to include overhangs.)
  6. After that, measure the width of your house. (Be sure to include overhangs.)
  7. Multiply your house length by your house width to get the area. (For example, 40 feet x 30 feet = 1,200 square feet.)
  8. Next, multiply the area by your roof’s pitch. (1,200 x 1.05 = 1,260 square feet.)
  9. To allow for hips, ridges, and waste, add 10% of your final number for a gable roof and 17% of your final number for a cottage roof. (Your total number would be either 1,386 or 1,474 square feet.)

When measuring a roof you must ALWAYS draw the layout of the roof. Your roof layout sketch must include the dimensions, slopes, obstacles and penetrations, and any other unusual situations such as areas of soft spots, rotten wood, and anything other obstacles.

Once you have all your measurements you will use them to calculate your areas, slopes, angles, and allowance factors. 

roof quotes online

Online Roof Measurements

What is roofing measurement tool?

Whether you’re installing shingles, metal, tile, composites, slate, shake, or commercial roofs, the Sky Roof Measurement Tool will increase your efficiency, helping you save time, increase sales, and grow your business. Scaling a ladder and crawling atop a roof can be time-consuming and hazardous.
 
The Area Calculator can be used to calculate the area of a variety of simple shapes that together can comprise the area of the roof. Using the aggregate area of these simple shapes can yield a more accurate roof area to be used with the Roofing Material Calculator.
 
Contractors will also be able to upload drone images or blueprints to measure. Once mapping is completed, the user receives a final, downloadable report on the area, pitch, direction, and edge lengths of the roof, which helps determine how much roofing material to purchase, the amount of time the project will take, and the total cost to the customer.

Roofing Tips: Roof Slope & Style

There are two main categories of roofing: sloped and flat. A flat roof has a slope of 2 in 12 or less. The run always remains constant at 12 inches. A low slope roof is anywhere from 2 in 12 to 4 in 12. Conventional slope roof range between 4 in 12 and 8 in 12. Anything more than 9 in 12 is considered steep. Steeper-sloped roofs are considered more aesthetically pleasing and last longer. These benefits do not come cheaply though. A 12 in 12 roof can cost up to 50% more than a 4 in 12 roof. This is because a steep-sloped roof requires a taller chimney and more lumber for framing. 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.

Roof styles or types are usually predesigned by the builder of your home. They determine what kind of materials you can have on the roof, due to the slope. The first option is a flat roof. This style is just like a long board across the top of your home. A gabled roof looks like two sides of a triangle. A shed roof is slanted down one way, either towards the left or right. Gambrel roofs resemble barn roofs. Finally, mansard roofs have a flat top with sides that lip over the top a little and hang over the home.

roof measurements

Satellite Roof Measurements: Features of a Roof Report

  • Accurate Roof Pitch Measurements
  • Roof Measurements including AreaRakesRidgesHips and Valleys, and every edge is separately measured and identified.
  • CAD style drawings with colored lines identifying every type of roof edge
  • Online access to your Roof Reports for your Employees, Subs and Suppliers with no software to install
  • Multiple image providers for over 98% coverage of the USA & Canada
  • Also supports file formats such as XML,RFX,DFX/DWG AND WRL
roof blueprint

How to Measure a Roof From the Ground

If you’re planning work on a roof and don’t have the building plans, taking preliminary measurements from the ground allows you to approximate the roof area and estimate some costs. Measuring hip roofs, dormer roofs or roofs on hillside homes from the ground requires experience and special equipment. But, you can measure a gable or flat roof from the ground with the help of an assistant.

Method 1: Counting asphalt shingles to measure your roof area from the ground.

Most asphalt shingles are three feet wide with three tabs. Each tab is got 5 inches of reveal. So by counting these in digital photos you can come up with pretty reliable dimensions. If there is any doubt on the shingle dimensions, you can calibrate the method by measuring a typical shingle in a lower, accessible location.

Method 2. Pythagorean Theorem.

Measure the horizontal run of the roof surface from the ground (‘a’ in the third figure below). Then count the number of shingles to the peak of the roof. Multiple the number of shingles times the width of each shingle (which you can measure at ground level) to get ‘b’ in the figure below. Then calculate the line length of the roof (‘c’ in the figure) using the Pythagorean Theorem; c = square root (a squared + b squared). It is also easy to calculate the roof angle by taking the inverse tangent of b divided by a.

With these simple tricks you can measure your roof area from the ground.  

Roofing Calculator

How Roof Pitch is Calculated

To accurately calculate the area of your roof, you must first determine its slope, or pitch. A roof’s pitch is determined by how much it rises vertically for every foot it runs horizontally. Thus, a moderate “6 in 12” roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. A “12 in 12” pitch is a steep, 45-degree angle roof. See the image below for more explanation on rise, run and pitch.

Three Easy Ways To Measure Your Roof’s Pitch

Pitch Measurement Method 1

Roof Pitch Calculator

1. On a ladder beside the roof, place the level a foot or so up the roof, hold it level, and measure from the 12-inch mark on the level’s bottom, straight down to the roof. If this distance measures 4 inches, you have a 4 in 12 pitch; 8 inches and you have an 8 in 12 pitch.

Pitch Measurement Method 2

Roof Calc

2. On a ladder at the gable end of your house, place the level against the gable trim, flat against the side of the house. Now measure from the 12-inch mark of the level up to the bottom edge of the gable trim. This distance is the roof’s rise.

Pitch Measurement Method 3

Roofing

3. In the attic, place the level against a rafter with the 12-inch mark on the bottom of the rafter. Measure from the end of the level up to the bottom edge of the rafter. That is the roof’s ris

 

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Aerial Roof Reports

Gain the confidence you need to expedite critical projects without even having to set foot on the construction site. With aerial roof measurement reports from SkyRoofMeasure™, you can save both time and money. A project could be one roof, or multiple roofs; either way, these measurement reports have you covered. Gone are the days of scaling damaged roofs for more accurate measurements. Today, groundbreaking roof measurement systems precisely determine the dimensions of a roof.

How to Manually Measure a Roof

To manually measure a roof without the help of aerial measurement reports, you must visit a job site and climb onto the roof to take precise roof measurements by hand.

  1. Measure the width and length of each plane of the roof (including dormers), and then multiply those numbers to get the correct figure for the square footage of that area.
  2. Note any skylights, chimneys or other parts of the roof that would not require materials so you can subtract those measurements from your total area.
  3. Add together the calculated square footage of each surface to get the figure for total square footage of the roof.
  4. After determining the total square footage of the roof, you must calculate the pitch of the roof by measuring the vertical distance (rise) over a 12 inch horizontal segment (run).
  5. Write down these numbers as the vertical measurement listed first and the horizontal measurement recorded second so you can find rise over run.
  6. When you have the total square footage and rise over run of the roof, you can calculate the roof squares to determine how much materials are needed to cover the roof. To calculate the number of squares on a roof, you need to divide its total square feet by 100.

With those figures, you can then estimate the roofing supplies needed for a job.

Our Goal & Specialization

Our goal at Skyroofmeasure is to streamline your day to day operations by automating your employees and allowing them to work more efficiently with the help of our interactive Roof Reports. When your roof report is ready, it is not just emailed to one person, or available for download into a single desktop application, it is available to anyone in your company using a web based user account. All your reports saved on our database and you can view and download any time as per your convenience. Our 3D Roof reports include Aerial Images, rakes, flashing, valleys, ridges, multiple slope areas, pitch, linear measurements, total squares, recommended waste, etc. Our System can Export and import file formats such as XML,RFX,DFX/DWG and WRL.

Satellite roof measurements

How Do You Calculate Shingles For a Roof

How Many Roofing Shingles Do I Need?

  1. Measure the length and width of each plane on the roof (including dormers) then multiply length times width.
  2. Add the square footage of each of the planes together.

The average bundle of shingles covers 33.3 ft2, so three bundles of shingles are needed per square. Asphalt shingles range in price from about $25 per bundle for a standard 3-tab style to around $50-$75 or more for an upgraded architectural style.

How many square feet does a bundle of shingles cover?

33.3 sq. ft.
 
Calculating the number of bundles, you need is simple if you are using shingles that come three bundles to a square. Each bundle covers 33.3 sq. ft. of roof area—which is close enough to the 32 sq.

How many shingles are in a square?

When shingles come three bundles to the square, there are 29 standard-sized shingles (12 in. by 36 in.) in each bundle. Figuring out the roof area is the first step to determine how many bundles you’ll need to order.
 

How Shingle Quantities are Measured

When you have a bundle or square count for the main roof area, you will then add additional shingles to account for waste, starter shingles, and extra shingles for hip and ridge caps.

 

1. Measurement method

The most accurate way to calculate how many bundles of shingles you’ll need is to get up on the roof and measure each roof plane. If all the roof planes are rectangles, you simply need to multiply the length times the width of each plane to get the square footage; then you will add up the square footage of each plane. Many times, the roof may be too steep to walk on without safety equipment, so you will have to do the estimate from the ground. If this is the case, measure the length of the building at the ground level and estimate any rake-edge overhangs. Next, from a ladder, use a stiff, wide blade measuring tape to measure from the edge of the eaves to the ridge.

 

2. Sheet-count method

If the sheathing is still exposed you can use the sheet-count method, which is sometimes preferred more than the measurement method. This method is fast, and you can usually complete it from the ground. The caveat is you can use this method only on roofs sheathed with 4x8ft. structural panels. Each of these panels is 32 sq. ft., and you can easily count the full panels from the ground. Another way to tally them up is by estimating the relative size of ripped and crosscut sheets along the edges of the roof to the size of a full sheet. Diagonally cut sheets along hips and valleys are a bit more of a challenge to size, but typically you can assign them a relative size, like half or quarter sheet, and it will be close enough

Calculating the number of bundles, you need is simple if you are using shingles that come three bundles to a square. Each bundle covers 33.3 sq. ft. of roof area—which is close enough to the 32 sq. ft. a sheet covers, which means you can order one bundle for each sheet of roof sheathing.

If you are working with other bundle counts per square, simply divide the number of sheets of sheathing by three and you’ll have the total number of squares needed to cover the roof – this is because three sheets of sheathing equal roughly 100 sq. ft. (one square).

 

3. Shingle-count method

This method makes it easy to measure when the old shingles haven’t been stripped off yet or if you’ll be doing a layover (meaning shingling over existing shingles).

To start, measure the length of the eaves of each roof plane, either directly from on top of the roof or from the ground by measuring the length of the house and adding in the width of the rake overhangs, if any. Alternately, if the existing shingles are standard three-tab, determine the eaves’ length by counting the number of tabs along the ridges and eaves to determine the length in feet (note that one tab is equal to 1 ft.).

Count the existing courses of shingles from eaves to the ridge to get the length of the rakes. The exposure on each course of shingles is five inches, so multiply the number of courses by five inches and then divide by 12 to get the length of the rakes. Make sure you check that the existing shingles are not metric size and are the standard 12-in. by 36-in. shingles. To get the area in square feet just multiply the length of the eaves by the length of the rake and get the details.


 

Climbing around on a roof is not safe, so we do not recommend measuring the planes of your roof yourself. Plus, it is important that the measurement is accurate if it will be used to purchase roofing materials. So instead of going to the trouble yourself, contact a reliable roofer for an estimate. The roofer can use professional tools and methods to measure your roof and calculate the total square footage, and then provide estimates for shingles, underlayment, and other materials based on that total.

Aerial measurement

Calculate Roof Area

Installing a new roof is a capital intensive affair that requires you to establish your budget in advance. Thankfully, it is easy to estimate the costs by calculating the roof area and then using the sum to determine the cost of shingles per square foot.

How to calculate the roof area

  1. Begin with calculating the area of your house in a plane parallel to the ground. If your house is rectangular, all you need to do is multiply the length and width of the building. If the shape of your house is more complex, simply enter the total area (after measuring the exterior dimensions) into the appropriate box.
  2. Determine the roof pitch of your house. Roof pitch is the slope created by the rafters. If you don’t know how to calculate it, head to our roof pitch calculator. You can input it either in degrees, as a percentage or as a ratio of x:12.
  3. Once you know these values, you will be able to calculate the roof area. Begin by converting the roof pitch to an angle expressed in degrees, using the following formulas:

pitch(%) = x / 12 * 100%

pitch(deg) = arctan [pitch(%)]

  1. Then, use the following equation to find the total area of the roof:

roof area = base area / cos[pitch(deg)]

Satellite roof measurements

How to Estimate Roofing Materials

Although roofing projects are estimated and sold by the square, roofing material is often not sold in 1 square increments.

How Many Bundles of Shingles Will You Need

The average bundle of shingles covers 33.3 ft2, so three bundles of shingles are needed per square. Asphalt shingles range in price from about $25 per bundle for a standard 3-tab style to around $50-$75 or more for an upgraded architectural style.

Since transportation is a major cost factor, expect prices to vary by location. A typical bundle of shingles weighs about 75 pounds, while some premium products can weigh over 100 pounds per bundle, so consider delivery of materials.

How Many Rolls of Felt Will You Need

Roofing felt is sold by the roll. The average roll of 15-pound roofing felt covers about 400 ft2, or 4 squares, while the average roll of 30-pound roofing felt covers about 200 ft2, or 2 squares.

Rolls of felt are 36″ wide x 144′ long for 15# and 72′ long for 30#. Consider other underlayment options as needed, such as rubber or tar products.

How Many Nails Will You Need

Nails will also be required for any roofing project. The average 3-tab shingle needs four nails per shingle. High wind areas and other types of shingles may need more. 320 nails will be needed to install a square of standard 3-tab shingles, assuming four nails per shingle and 80 shingles per square.

Remember, be wary of too-good-to-be-true estimates that promise cheap and fast results. Investing in name brand materials and quality service will save you time and money in the long run.

How to measure your roof area from the ground

A more accurate way to calculate the area of the roof than using Google Earth is to get outside to estimate the roof pitch and the base area of the property. Using these two figures, we can get a good idea of the shingle roof’s square footage and estimate your asphalt shingles’ needs and costs. This DIY technique can be helpful, especially if you are not comfortable getting on your roof, or if you have limited access to it.

Ground measures only work well for a gabled roof, since there are usually just two main rectangular pitches to calculate area for. For more complex roof shapes, like hip roofs, you’ll need to work with a roofer or measure from on top of the roof itself to calculate its total area.

Roofing reports

Measuring a Roof From The Ground

Measure out from the face of the wall below the fascia or rafter tails to a point that aligns with the outer edge of the roof. Multiply this measurement by the length of the roof from end to end, and add this to the first result. Double the result to determine the total area of the roof at both sides.

Measuring your roof is the first step in a successful re-roofing project. You can actually get an estimate of your roof’s measurements from the ground if you’d rather not climb a ladder and get up on the roof yourself. Otherwise, you can climb up onto your roof to take more accurate measurements. Either way, we’ve got you covered! 

The Technique For Estimating Square Footage of Hip Roofs


There is a different technique I use when measuring “hip” roofs, which have 4 sides and are shaped kind of like a pyramid. These roofs make it tough to count shingles so, through trial and error, I came up with a little calculation that has provided me with another simple but accurate estimation. When using this second calculation, the total square footage number you end up with may be a little higher than what is actually there. But I would rather slightly over-estimate the size of a roof job rather than under-estimate it, like I did a few times early on. This was before I started using these two calculations.

For Hip Roofs, I measure the length of the house and then I measure the width. I then multiply these 2 numbers together and I take that number and multiply it by 1.35.

I should mention that I use a Canon digital camera that has a 10x “optical” zoom along with a 40x “digital” zoom (not really sure what the hell that means exactly) but it allows me to zoom in really close to get great photos of the flashing as well as the condition of the current roofing materials. Regardless of which brand of camera you use, I have found that the most important feature is the “size of the zoom” because it allows you to take great photos of just about any roof while standing on the ground.

Binoculars can be helpful on high roofs.

Rakes and Valleys: Visually count how many rows of existing roofing, multiply by inches base on exposure, then divide by feet. Open the Roof Calculator Writer program, select the appropriate roof pitch or use our Roof Pitch Calculator Enter your measurements for roof area, hip etc.

 

MEASURING THE PITCH

To calculate the area of your roof, first you’ll need to calculate the pitch of it:

  1. First, use your measuring tape to measure 12 inches on your large level and make a mark at the 12-inch line.
  2. Next, place your ladder against your house at the gable end.
  3. Climb to the top of your roof.
  4. After that, place your level against the gable trim and flat against the side of the house.
  5. Using your measuring tape, measure from the 12-inch mark on your level up to the bottom edge of your gable trim. This number is your rise.
  6. Each rise measurement is written as “# in 12” and this is your roof’s pitch. (For example, if your rise is 4 inches, your roof’s pitch is 4 in 12.)

 

  1. Residential Roof Estimation

CALCULATING THE AREA (TRUE)

If you want to get the exact area measurement for your roof, you can follow these steps:

  1. Once you have your roof’s pitch, divide the number by 12. (For example, if your roof’s pitch is 4 in 12, you would divide 4 by 12. This would yield 1/3.)
  2. Next, square your result. (If your number is 1/3, squared would yield 1/9.)
  3. After that, add 1 to your number. (1/9 + 1 = 10/9.)
  4. Next, figure out the square root of your new number. (The square root of 10/9 is 1.05.)
  5. Next, use your measuring tape to measure the length of your house. (Be sure to include overhangs.)
  6. After that, measure the width of your house. (Be sure to include overhangs.)
  7. Multiply your house length by your house width to get the area. (For example, 40 feet x 30 feet = 1,200 square feet.)
  8. Next, multiply the area by your roof’s pitch. (1,200 x 1.05 = 1,260 square feet.)
  9. To allow for hips, ridges, and waste, add 10% of your final number for a gable roof and 17% of your final number for a cottage roof. (Your total number would be either 1,386 or 1,474 square feet.)