How Do You Measure a Roof Without Measuring It?

February 19, 2021

By AerialTakeoff

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 2400 square feet by 100 (2400 ÷ 100 = 24). This means you would need 24 squares of shingles to cover that roof.

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.)

How to Measure 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.

How do you measure the pitch of a roof from the outside?

To measure the roof pitch, you’ll need an 18- or 24-inch level, a tape measure, and a pencil. First, measure 12 inches from one end of the level and make a mark. Then, in the attic, place the end of the level against the bottom of a roof rafter and hold it perfectly level.

Is the square footage of a house the same as the roof?

Square Footage of Your Roof:

So a trick to estimate your roof size is to multiply the square footage of your house by 1.5 (ex: A 2,000 square foot house will have a roof that is approximately 3,000 square feet).

How much does it cost to reroof a 1000 square foot house?

Average Cost to Replace a Roof by House Size

House (& Roof) by Square Foot**	Re-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

How much is a square of shingles?

Shingles are sold by the bundle and by the square. A square is equal to 100 square feet and will cost anywhere between $100 and $1,800. A bundle is around 1/3 of a square and costs an average of $30 to $600.

How many square feet are in a bundle of shingles?

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 much does it cost to tear off and replace a roof?

On average, it costs from $1.20-$4 per square foot to tear off and replace a roof with asphalt shingles. For a 1,700-2,100 square foot ranch-style property, that costs about $1,700-$8,400. However, roof replacement costs increase when you use higher-end roofing materials.