Your roof is a major structural ingredient of her home. A successful re-roofing task requires a huge 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 just how Much Roofing material You Need

If friend have decided to do the work-related on your own, inspect out our estimating indict below and also these other Roofing resources:

How many Roofing Shingles carry out I Need?

To estimate how much roofing product you need, such as bundles of architectural shingles or roll of man-made roofing underlayment, you require to know the full square footage of her roof’s surface.

How come Calculate full Square clip of your Roof

To find your roof’s full square footage:

Measure the length and width that each plane on the roof (including dormers) climate multiply length times width.Add the square footage of every of the plane together.

Example #1: shed Roof v One Roof Plane

For example, this burned roof has actually one roof plane.

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Shed Roof through One Roof Plane

Multiply length (A) times broad (B):

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

Example #2: Gable Roof v Two Roof Planes

This gable roof has two planes.

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Gable Roof v Two Roof Planes

So to have the complete square clip of the roof, girlfriend would:

Multiply size (A) times broad (B) and length (A) times broad (C) to acquire the square footage for each plane. Add the two 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 + aircraft 2 = 2400 sq. Ft. Because that the total square footage of the roof.

What is a “Roofing Square”?

Roof surfaces space measured in “squares”.

A roofing square is equal to 100 square feet that the roof.

To identify the variety of squares top top the gable roof instance in this post, divide its total of 2400 square feet by 100 (2400 ÷ 100 = 24).

This way you would require 24 squares the shingles to cover that roof. Be certain 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 watch the size of her roof in squares, and also the steep (pitch) of your roof. Keep the report top top hand for future conversations with roofers or as soon as reviewing estimates for your following roof replacement or repair.

Ready to acquire an estimate?

Search our perform of independent roofing contractors in the Owens Corning Roofing Contractor Network to find the roofing professional that’s appropriate for you.

How many bundles of shingles every square?

A package of roofing shingles is referred to as a bundle. Laminate or architecture shingles, among the most common types of roofing shingles, are normally packaged in three bundles every square.

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

Here space a pair more examples:


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A package of shingles is referred to as a bundle. 3 majority = 1 roofing square (98.4 sq. Ft.)

What about the waste factor? should I order extra roofing materials?

You want to order extra material to account because that waste. Waste determinants vary.

10%-15% is a good rule that thumb, however your results may be different. More complicated roofs will have actually a higher waste factor since there space usually much more cut shingles about corners, walls, and edges.

It is it s okay to have a few shingles left over. They have the right to be conserved in instance there is roof damage later or if repairs should be excellent in the future.

So because that the 24 square roof example, girlfriend would want to add 2.4 squares which equal around 7 or 8 more bundles.


How lot Roofing Underlayment execute I Need?

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

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

How plenty of squares per roll of underlayment?

The role size counts on the kind of underlayment product. Synthetic underlayment come in 10 square rolls, while consistent #15 felt comes in 4 square rolls.

So for the 24 square roof example, girlfriend would need 2.4 roll of synthetic underlayment, or 6 roll of continual #15 felt.

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

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

Finally, if girlfriend have any kind of questions around your estimate, ask a roofing contractor in your area. Many will be happy to provide you a cost-free estimate.

What’s her roof slope?

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You will also need to recognize the slope of your deck.

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

If this increase is 4″, then your roof slope is 4 in 12.

Roof slopes are always expressed through the vertical increase mentioned an initial and the horizontal run (12″) mentioned second.

What if you have a steep roof?

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

Method 1

Calculate the roof length by measuring the exterior walls plus the overhang for the size of the home parallel come the ridge.

Next, litter a rope over the ridge and also mark it whereby it meets each eave. This will give the width measurement to usage in figuring your area. This have to be done on every roof ar containing a horizontal ridge.

Method 2

Determine the roof area by making use of a mathematical formula that accounts because that the roof length, total span, and also roof pitch:

Determine your roof pitch by utilizing a pitch gauge (available at many home innovation stores) or a smartphone app (available complimentary through any kind of app store).Measure the size of the roof surface, consisting of overhangs.Measure the span of the roof, including overhangs.Multiply the size x the span. The result will it is in the plane area. Usage the chart below to calculation the full area the the roof.Calculate the total roof area – plane Area x Correction variable = Roof Area

Slope mediate Factor

SlopePlaneCorrection Factor
PitchApproximate AngleMultiply by estimate 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 should use four nails every shingle in the field of the roof, and also 5 nails per starter shingle. For constant three-tab shingles, this would need 320 nails per square for field shingles. Multiply the variety of starter shingles compelled by 5 to determine the variety of nails forced to close starter course.

For high wind areas or when shingles are being applied to a mansard, six nails every shingle are required, or 480 nails per square. This is based on 80 shingles every square.

Other formats of shingles might require much more or fewer nails every shingle and may have an ext or less than 80 shingles per square. Describe the application instructions on her shingle wrappers because that the exactly nailing pattern.

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Always check what local structure code dictates because that fasteners. Ask your dealer for the exactly amount that nails for your size roof, in the length you specify.