Your roof is a major structural ingredient of her home. A successful re-roofing project requires a big investment in both time and money. Since you cannot afford mistakes during installation, we extremely recommend you rental a skilled roofing contractor.

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Estimating exactly how Much Roofing product You Need

If friend have decided to carry out the job-related on your own, check out ours estimating guidelines below and also these various other Roofing resources:

How many Roofing Shingles carry out I Need?

To estimate just how much roofing material you need, such as bundles of architecture shingles or rolfes of synthetic roofing underlayment, you need to know the full square clip of your roof’s surface.

How come Calculate complete Square footage of your Roof

To uncover your roof’s complete square footage:

Measure the length and also width that each plane on the roof (including dormers) climate multiply size times width.Add the square clip of each of the airplane together.

Example #1: shed Roof through One Roof Plane

For example, this melted roof has one roof plane.

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Shed Roof v One Roof Plane

Multiply size (A) times broad (B):

A x B = 40′ x 30′ = 1200 sq. Ft. For the complete square footage of the roof.

Example #2: Gable Roof with Two Roof Planes

This gable roof has two planes.

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Gable Roof with Two Roof Planes

So to have the total square clip of the roof, friend would:

Multiply size (A) times width (B) and also length (A) times width (C) to get the square footage for each plane. Include the 2 planes together.

For example:

Plane 1 (A x B): 40′ x 30′ = 1200 sq. Ft.Plane 2 (A x C): 40′ x 30′ = 1200 sq. Ft.Plane 1 + airplane 2 = 2400 sq. Ft. Because that the full square clip of the roof.

What is a “Roofing Square”?

Roof surfaces space measured in “squares”.

A roofing square is same to 100 square feet of the roof.

To determine the number of squares ~ above the gable roof instance in this post, division its complete of 2400 square feet through 100 (2400 ÷ 100 = 24).

This way you would require 24 squares the shingles to cover the roof. Be sure to include 10%-15% to every your material totals because that trim allowance (waste factor).

Pro Tip: Want come skip doing some math? bespeak a cost-free RoofScopeX aerial roof report to check out the size of her roof in squares, and the steep (pitch) of your roof. Keep the report on hand for future conversations v roofers or once reviewing estimates for your next roof replacement or repair.

Ready to obtain an estimate?

Search our list of live independence roofing home builders in the Owens Corning Roofing Contractor Network to find the roofing experienced that’s right for you.

How plenty of bundles the shingles per square?

A package of roofing shingles is dubbed a bundle. Laminate or architectural shingles, among the many common varieties of roofing shingles, are typically packaged in three bundles every square.

So in the 2400 square foot gable roof example, friend would need 72 majority of shingles (24 squares x 3 bundles per square = 72 bundles).

Here space a couple more examples:


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A parcel of shingles is dubbed a bundle. 3 majority = 1 roofing square (98.4 sq. Ft.)

What around the rubbish factor? must I stimulate extra roofing materials?

You desire to stimulate extra product to account because that waste. Waste factors vary.

10%-15% is a an excellent rule the thumb, but your results may be different. More complex roofs will have actually a higher waste factor due to the fact that there are usually more cut shingles roughly corners, walls, and also edges.

It is it s okay to have a few shingles left over. They deserve to be saved in case there is roof damage later or if repairs need to be excellent in the future.

So for the 24 square roof example, you would desire to add 2.4 squares which equal around 7 or 8 much more bundles.


How lot Roofing Underlayment perform I Need?

If friend are additionally installing underlayment, then you would require the same amount of underlayment to cover the roof deck.

So in the 2400 sq. Ft. Gable roof instance in this post, girlfriend would need 24 squares of roofing underlayment.

How numerous squares per role of underlayment?

The roll size counts on the form of underlayment product. Fabricated underlayment come in 10 square rolls, while consistent #15 felt comes in 4 square rolls.

So because that the 24 square roof example, girlfriend would require 2.4 rolfes of synthetic underlayment, or 6 rolls of continual #15 felt.

24 squares ÷ 10 squares per role = 2.4 rolfes of fabricated underlayment24 squares ÷ 4 squares per roll = 6 rolfes of consistent #15 felt

Remember: include 10%-15% because that the waste element on underlayment, together well.

Finally, if you have any type of questions about your estimate, ask a roofing contractor in your area. Most will be happy to give you a totally free estimate.

What’s your roof slope?

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You will likewise need to know the steep of your deck.

To identify this, measure the vertical rise of your deck in inches end a 12″ horizontal distance.

If this climb is 4″, then her roof slope is 4 in 12.

Roof slopes are always expressed with the vertical rise mentioned very first and the horizontal operation (12″) pointed out second.

What if you have actually a steep roof?

To measure a steep roof, use among the following alternative methods:

Method 1

Calculate the roof length by measure the exterior wall surfaces plus the overhang because that the length of the home parallel come the ridge.

Next, litter a rope end the ridge and mark it where it meets each eave. This will give the width measurement to usage in figuring her area. This have to be excellent on every roof ar containing a horizontal ridge.

Method 2

Determine the roof area by utilizing a mathematics formula the accounts for the roof length, full span, and also roof pitch:

Determine her roof pitch by making use of a key gauge (available at many home innovation stores) or a smartphone application (available free through any app store).Measure the size of the roof surface, including overhangs.Measure the span of the roof, consisting of overhangs.Multiply the size x the span. The an outcome will be the airplane area. Use the chart below to calculation the complete area of the roof.Calculate the full roof area – airplane Area x Correction element = Roof Area

Slope convey Factor

SlopePlaneCorrection Factor
PitchApproximate AngleMultiply by projection Length
3:12141.031
4:12181.054
5:12231.083
6:12271.118
7:12301.158
8:12341.202
9:12371.25
10:12401.302
11:12431.357
12:12451.414
16:12531.667
18:12561.803
24:12632.236

Roofing Nails

Generally, you have to use 4 nails per shingle in the ar of the roof, and also 5 nails every starter shingle. For regular three-tab shingles, this would call for 320 nails per square for field shingles. Main point the number of starter shingles required by 5 to recognize the number of nails required to fasten starter course.

For high wind locations or as soon as shingles are being applied to a mansard, 6 nails every shingle space required, or 480 nails per square. This is based upon 80 shingles per square.

Other styles of shingles might require more or under nails every shingle and may have much more or much less than 80 shingles every square. Refer to the application instructions on her shingle wrappers for the exactly nailing pattern.

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Always examine what local building code dictates because that fasteners. Ask your dealer because that the correct amount of nails for your size roof, in the size you specify.