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How to measure a roof for shingles calculator

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This makes it relatively easy to figure out how many shingle bundles your roof requires: simply multiply the number of roofing squares by three. If your roof’s area were equivalent to about 20 roofing squares, then you would need about 60 bundles of shingles.
A square of shingles is the quantity needed to cover 100 sq.ft.of roof. Shingles are packaged in paper- or plastic-wrapped bundles designed to be light enough for a person to carry, so heavier shingles require more bundles per square.
Thus, to cover roof of a 1500 square foot house, you would need 57 bundles of shingles. Thus, it will take 57 bundles of 3-tab standard size shingles (12″×36″) to cover roof of 1500 square feet house. Thus, there are 57 bundles of standard size 3-tab shingles you will need to cover roof of 1500 square feet house.
Asphalt shingles and most other roof shingles are typically available in bundles. For each roofing square or 100 sq ft, you will need three bundles of shingles. The average size of 12×12 shed roof is 3 squares, which typically requires 9 bundles of three-tab asphalt shingles or any other starter strips.
roof size calculator by address
A package of shingles is called a bundle. There are between 15 and 29 shingles in a bundle. A bundle typically covers 33 square feet regardless of shingle type. Divide total square footage by 33 to find how many bundles you need.
You will need approximately 42 bundles of standard size 3-tab asphalt shingles (14×3 = 42 bundles) or 56 bundles of architectural shingles (14×4 = 56 bundles) for 1,400 square feet. Thus, for a 1400 square foot gable roof, you would need 42 bundles of shingles plus 10% of ridge, starter and wastages.
How many roofing squares is 1600 square feet? So a roof that has 1600 square feet of area has 16 squares. Remember that unless the roof is flat, the square footage of the building is different than the square footage of the roof.
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How do I calculate roof covering area?

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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.)

Divide the total roof area by 32 to get the number of sheets you will need to cover the roof. A typical 4 foot by 8 foot sheet of plywood covers 32 square feet. 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.
1 square is equal to 100 square feet of the roof. To determine the amount of squares you’ll need for your old or new roof, just divide the total square footage by 100. The number of bundles you’ll need for your home will depend on how many squares your roof is.
roof
A roofing square is an area of roof that measures 10 by 10 feet to make up a total of 100 square ft. This critical unit of measurement helps your contractor determine how much material they’ll need to order for your roofing project, from underlayment to bundles of roof shingles.

Roofing Quote Footage is Not the Same as Home Square Footage


Depending on where the information is coming from is going to determine the basis on which the estimated roof footage is calculated. The roof square footage is what we (roofing contractor) need to calculate a budget quote to do the job.
Foam backed polycarbonate and clear polycarbonate roofing options are the most commonly used types of polycarbonate sheets. Foam-backed polycarbonate roof sheets are lightweight and durable. They are installed in industrial buildings, like warehouses, because of their longevity and strength.
These single wide homes all have 3-bedrooms, 2-bathrooms, and a single living room. They all include kitchen appliances as well. The homes are 1140-1178 square feet.
Roof Dimensions Google Maps

Roof Dimensions Google Maps

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  1. On your computer, open Google Earth.
  2. Search for a place, or select a location on the globe.
  3. On the left, click Measure. . …
  4. Click the map to set measurement points.
  5. To remove a point, on the right, click Undo .
  6. To complete your line measurement, double-click on your last point, or click Done .
Measure distances and areas in Google Earth
Measure distance between points
  1. On your computer, open Google Maps.
  2. Right-click on your starting point.
  3. Select Measure distance.
  4. To create a path to measure, click anywhere on the map. To add another point, click anywhere on the map. …
  5. When finished, on the card at the bottom, click Close .

Sky Roof Measure provides industry leading takeoff and  Roof Estimating Reports for professional construction contractors. Please Email : info@skyroofmeasure.com

To find your roof’s total square footage: Measure the length and width of each plane on the roof (including dormers) then multiply length times width. Add the square footage of each of the planes together.
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To calculate your roof area, simply multiply your roof length by your roof slope height, and multiply this by two. This should give you the total area of your roof, not accounting for a chimney or other sections of your roof not covered by tiles.
For a 1500 square foot house, you will need approximately 19 squares or 57 bundles or 1653 pieces of 3-tab standard-sized shingles (12 inch by 36 inch) when overhangs is 1 feet and roof slope is 4/12.
The angle, or pitch, of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. For example, a roof that rises 6 inches for every 12 inches of horizontal run has a 6-in-12 pitch.
 

What roof pitch is 30 degrees?

A 30° roof pitch is roughly the same as a 7/12 roof pitch.
Minimum thickness of a rcc roof slab is completely dependent upon the types of slab, may be One way or Two way slab or flat slab, Span of slab, Design load upon the slab. The minimum thickness of a slab is not less than 4 inch according to the indian standard.

Sky Roof Measure provides industry leading takeoff and  Roof  estimating Reports for professional construction contractors. Please Email : info@skyroofmeasure.com

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The normal thickness range for sheathing is 3/8 to 3/4 inch. Multiple factors should be taken into account when determining appropriate roof sheathing thickness, like the span of roof joists and snow load for the area.

Price of Roofing Shingles Per Square Foot

Roof AreaCost of Shingles
1,000 square feet$910 – $1,100
1,500 square feet$1,400 – $1,600
1,750 square feet$1,600 – $1,850
2,000 square feet$1,810 – $2,110

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How do you measure a roof for Blueprint shingles?

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Here’s a step-by-step guide to measuring with blueprints:

  1. Open the app and select “Measure Your Roof.”
  2. Select “Sketch My Roof.”
  3. Retrieve your blueprint image by tapping “Load,” then selecting the source of the file, i.e., your email, Dropbox, etc.
  4. Select the blueprint you wish to measure.

How many shingles do I need for 1000 square feet?

Since there are twenty six shingles in a bundle of twenty year shingles (which is fine for starters and edges), divide the result by twenty six. For the number of ridge caps, multiply the length of the hip or ridge by twelve and divide it by five. This house is 1000 square feet. It requires 18 squares of shingles.
Price of Roofing Shingles Per Square Foot.
Roof AreaCost of Shingles
Roof AreaCost of Shingles
750 square feet$700 – $800
1,000 square feet$910 – $1,100
1,500 square feet$1,400 – $1,600

How many bundles of shingles do I need for 1700 square feet?

The shingles cover 33.3 sq. 57 bundles is a ft. 1,700 / 33.3 + 10% for trim.

Are 50 year shingles worth the money?

It’s one of the most common questions people ask when it’s time to replace their roof: Are 50-year shingles worth the money? … In most cases, 50-year shingles won’t improve on resale value of a home over 25- or 30-year shingles.

Is GAF or Owens Corning shingles better?

OC vs.

One area GAF Timberline Shingles really surpass Owens Corning is in their outstanding warranty offers. They are both pretty even when it comes to the standard roofing warranty, with 25 year limited and lifetime warranties on just about every type of shingle.

How many bundles of shingles do I need for 2000 square feet?

60 bundles
 
The number of bundles or squares you need will depend on the surface area of your roof, and its pitch or slope. For example, a 2,000 square foot roof will require 20 squares or 60 bundles. A professional will likely purchase slightly more materials than necessary to ensure there is extra material if needed.
 

How much does it cost to replace a roof on a 2200 square foot house?

A new asphalt shingles roof for a typical 2,000 to 2,200 square foot single-family house can range in price from $9,500 to $16,500 fully installed, including tear off and disposal of the old roof (up to two layers).
Artboard-1

Roof Square Footage By Address

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Can I measure a roof from Google Maps?

The good news is there is a way to measure your roof in a safe and accurate way, all from the comfort of your home: use Google Earth. With just a few clicks, you can search for any address, get a bird’s eye view of your roof, and get the roofing measurements that you need.
 
To find your roof’s total square footage:
  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.

How do you estimate roofing?

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.
 

Roof Size and Pitch

A new roof on a 1,000-square-foot house costs an average of $4,000 to $5,500 while the cost to replace a 3,000-square-foot home’s roof can rise to an average of $11,200 to $16,000.

What is the average price to tear off and replace a roof?

Around $12,000 to $15,000
 
Most homeowners can expect the average cost to tear off and replace a roof to be around $12,000 to $15,000. This price is based on a home with 3 bedrooms, 2 bathrooms, a walkable roof pitch, a little roof complexity, and dimensional asphalt shingles.
 

Sky Roof Measure provides industry leading takeoff and estimating reports for professional construction contractors. Please Email : info@skyroofmeasure.com

 

Average Cost to Replace a Roof 

House (& Roof**) by Square FootRe-Roofing Cost*
1,100 (1,160)$4,200 – $6,000
1,200 (1,265)$4,500 – $6,500
1,500 (1,581)$5,500 – $8,000
1,600 (1,687)$6,000 – $8,500

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.)

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Here's a step-by-step guide to measuring with blueprints

How do I calculate the size of my roof?

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To find your roof’s total square footage:
  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.

How do I calculate roof covering area?

To calculate your roof area, simply multiply your roof length by your roof slope height, and multiply this by two. This should give you the total area of your roof, not accounting for a chimney or other sections of your roof not covered by tiles. Follow Us for more details Please!

How do you calculate rafter length?

If you are calculating rafter length from the center of the ridge beam (as shown below), you will need to subtract half of the thickness of the ridge beam from the top end of the rafter. For example, if the ridge beam is 1.5 inches thick, subtract 3/4 of an inch from the overall rafter length.

Estimate Roofing Costs

Measure the square meter area of the roof you want replaced. The range of prices to replace your roof is: $50 to $95 per square meter. So multiple this rate against the square meter of the roof you want replaced.
 
Average Cost to Replace a Roof 
House (& Roof**) by Square FootRe-Roofing Cost*
1,000 (1,054)$4,000 – $5,500
1,100 (1,160)$4,200 – $6,000
1,200 (1,265)$4,500 – $6,500
1,500 (1,581)$5,500 – $8,000

Roof Pitch

Roof pitch (or slope) tells you how many inches the roof rises for every 12 inches in depth. An Example of a roof pitch would be a “6/12 pitch” which means that the roof rises 6 ” for every 12″ inward towards the peak (or ridge). There are two suggested ways to measure a roof pitch.

Are flat roofs more expensive?

While flat roofs can cost more than pitched roofs and often require more maintenance, lower-sloped roofs have a clear advantage to homeowners. Flat roofs have large overhangs that do not block light because of their low slope.

How much does it cost to roof a 2200 sq ft house?

In general, the replacement cost for asphalt shingles on a 2,200-square-foot home will range from approximately $8,200 to $12,000.
 
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How do I calculate the square footage of my roof?

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To find your roof’s total square footage:

  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.

Most common roof pitch

Conventional slope roofs are most common with residential roofs. This means the slope has a pitch between 4/12 and 9/12 on most homes. Roofs with a pitch exceeding 9/12 are called steep slope roofs.
 
Footage is Not the Same as Home Square Footage
Depending on where the information is coming from is going to determine the basis on which the estimated roof footage is calculated. The roof square footage is what we (roofing contractor) need to calculate a budget quote to do the job.

What roof pitch is 30 degrees?

A 30° roof pitch is roughly the same as a 7/12 roof pitch. To convert from degrees to the American ratio: Find the tangent of the angle, tan(angle).
A 7:12 roof pitch means that for ever 12″ of horizontal distance the roof will increase in height by 7″. … The following diagram will let you easily convert roof pitch to degrees; a 7:12 pitch equals 30.26 degrees.
 
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Conversions Table
10 Square Feet to Roofing Squares = 0.1800 Square Feet to Roofing Squares = 8
20 Square Feet to Roofing Squares = 0.2900 Square Feet to Roofing Squares = 9
30 Square Feet to Roofing Squares = 0.31,000 Square Feet to Roofing Squares = 10
 

How many bundles of shingles do I need for a 2000 square foot house?

The number of bundles or squares you need will depend on the surface area of your roof, and its pitch or slope. For example, a 2,000 square foot roof will require 20 squares or 60 bundles. A professional will likely purchase slightly more materials than necessary to ensure there is extra material if needed.
 

What’s a normal pitch roof?

The most commonly used roof pitches fall in a range between 4/12 and 9/12. Pitches lower than 4/12 have a slight angle, and they are defined as low-slope roofs. Pitches of less than 2/12 are considered flat roofs, even though they may be very slightly angled.

Is a 4/12 roof pitch good?

As well, a slope of 4:12 is most commonly considered the lowest slope for “standard shingle installations”. Most manufacturer and industry recommendations require, or at the very least recommend, special underlayment or other considerations on roofs between 2:12 and 4:12.
 

What is a 9/12 roof pitch?

9/12 roof pitch equivalents roof rises 9″ in a length of 12″. 9/12 roof pitch angle = 36.87 degrees.
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How to Measure For New Siding

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How do I calculate how much siding I need?

Start by measuring the height and width of each wall of the building. Multiply each length and height measurement to find the square footage of each wall, then add them together to find the total square footage. Divide the total by 100 to find the number of squares of vinyl siding to order.
 
A “square of siding” is a measurement of siding material. One square of siding is sufficient to cover 100 square feet of wall space. A square of siding is thus sufficient to cover a 10-foot by 10-foot section of exterior wall.

How many square feet does a box of siding cover?

200 square feet
 
A box of vinyl siding contains two “squares.” A square in construction lingo equals 100 square feet, so a box of vinyl siding will cover 200 square feet.
 

 Follow these steps for calculations you’ll use to learn how to measure for wood siding:

  1. Measure height and width of each side. For each side, multiply height times width to get the total square feet.
  2. Measure other areas not included in the sides, such as gables, dormers and more. For triangle areas, measure from the base of the triangle to the top and multiply that number by half of the base length.
  3. Measure the height and width of each window, door and other areas not covered by siding. When in doubt, account for 15 square feet for windows and 20 square feet for doors.
  4. Add together the square footage you calculated for the sides of your home and the additional areas.
  5. Subtract the uncovered areas’ square footage from the total amount you calculated in step four.
  6. Divide this number by 100 to get the number of squares of siding you will need to order.
Roofing reports

How to Measure the Roof of a Round Building

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How to Measure a Quonset Roof

  1. Measure the horizontal width of the Quonset roof to determine the diameter. …
  2. Multiply the diameter dimension time 3.14, referred to as “pi,” and then divide the result by 2 to determine the circumference measurement of the Quonset roof.

Turret Roof Difficulties - Absolute Roof Solutions - Vancouver - YouTube

How to Measure the Roof of a Round Building

1 . Measure the outer diameter of the building.

2 . Measure the amount of horizontal overhang between the building’s outer wall and the roof’s outer edge.

3 . Multiply the amount of overhang by two to include the opposite side of the building.

4 . Add the total overhang to the diameter. For example, a building diameter of 20 feet and an overhang of 1 foot on one side results in a total roof diameter of 22 feet.

5 . Measure the length of the rafters from the peak to the lower edge.

6. Calculate the total surface area of the roof using the following formula: pi times the radius times the rafter length, also called the slant height. To find the surface area using the diameter in the previous example and a rafter length of 20 feet, use the following calculations and use 3.14 as an approximation for pi:

Radius = 22 / 2 = 11.

Surface area in square feet = 3.14 * 11 * 20 = 690.8.

7 .  Determine the vertical height of the roof by finding the square root of the result of subtracting the squares of the rafter length and the radius. Using the previous results, the answer would look like this:

Rafter length squared = 20 * 20 = 400.

Radius squared = 11 * 11 = 121.

So 400 – 121 = 279.

The square root of 279 is approximately 16.7. In this example, the vertical rise of the roof is 16.7 feet from the outer edge to the peak of the roof.

Rafter Framing for a Conical Roof | JLC Online

Measuring Roof Slope and Pitch

Slope

Slope is the incline of the roof expressed as a ratio of the vertical rise to the horizontal run, where the run is some portion of the span. This ratio is always expressed as inches per foot.

Slope Ratio

A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a “4 in 12” slope. If the rise is 6 inches for every 12 inches of run, then the roof slope is “6 in 12.”

The slope can be expressed numerically as a ratio. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. For example, a “4 in 12” slope can be expressed as the ratio of 4:12. A “6 in 12” slope is expressed as 6:12.

The DIYer's Guide to Measuring for Replacement Windows - Bob Vila

Pitch

 
Pitch is the incline of the roof expressed as a fraction derived by dividing the rise by the span, where the roof span is the distance between the outside of one wall’s top plate to another.

Pitch Fraction

Historically the word “pitch” meant a ratio between the ridge height to the entire span/width of the building or ratio between the rafter length to the building width. And back then, the ridge was typically in the middle of the span. This is no longer the case in modern building practices. The ridge can be placed anywhere in the span, from directly middle to either span endpoint.
A roof that rises 8 feet over a 24-foot span was said to have a “1 to 3” pitch. If the rise is 4 feet over a 24-foot span, then the roof pitch was said to be “1 to 6.” 
 
The pitch can be expressed numerically as a fraction. The pitch fraction represents a certain amount of vertical rise over the entire span. For example, given a roof with a rise of 4 feet and a span of 24 feet, the pitch is “1 to 6” pitch, which can be expressed as the fraction of 1/6. A “12 to 24” pitch is expressed as 1/2.
Satellite roof measurements

How Do You Calculate Shingles For a Roof

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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?

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.

Measure distances and areas in Google Earth

**  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.

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Aerial measurement

Calculate Roof Area

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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.

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The calculated area is only an estimation. In cases where a roof has a complex shape, such as in the image to the right, measuring the dimensions and areas of each part of the roof to calculate total area will result in a more accurate measurement of area. The calculator cannot account for complex shapes based on a measurement of square footage alone. 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.

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The most common roofing materials used in the United States include shingles, membrane roofing, and ceramic tile, all of which have different life spans. Shingle roofs typically have a life span of 15-30 years, while membrane roofs usually last 5-15 years. Although ceramic tile roofs are expensive, they can have a life span of over 100 years.

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)]

Estimate Roof Size

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.

What is a Roofing Square?

Roof surfaces are measured in “squares”. A roofing square is equal to 100 square feet of the roof.

To determine the number of squares on the gable roof example in this post, divide its total of 24,000 square feet by 100 (24,000 ÷ 100 = 240). This means you would need 240 squares of shingles to cover that roof.

A roofing contractor might even charge you more labor fees for a roof replacement job by claiming that your roof is larger than it is or that it has a more complex layout than a standard roof. With the data from your Satellite Roof Report, you can cut out unethical charges and miscalculations in the early stages of your project. The Roofing Calculator keeps your roof replacement project transparent and free from costly surprises.

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