Your roof is a major structural component of your home. A successful re-roofing task requires a big investment in both time and money. Since you can not afford mistakes throughout installation, we highly recommend you hire a skilled roofing contractor.

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Estimating exactly how Much Roofing material You Need

If friend have decided to execute the work-related on her own, check out ours estimating accuse below and also these various other Roofing resources:

How many Roofing Shingles perform I Need?

To estimate just how much roofing product you need, such together bundles of architectural shingles or roll of artificial roofing underlayment, you need to know the complete square clip of her roof’s surface.

How come Calculate complete Square clip of your Roof

To find your roof’s full square footage:

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

Example #1: melted Roof through One Roof Plane

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

Shed Roof through One Roof Plane

Multiply length (A) times width (B):

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

Example #2: Gable Roof with Two Roof Planes

This gable roof has actually two planes.

Gable Roof through Two Roof Planes

So to have the complete square footage of the roof, friend would:

Multiply size (A) times width (B) and also length (A) times width (C) to get the square footage because that 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 + plane 2 = 2400 sq. Ft. For 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 the the roof.

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

This means you would require 24 squares that shingles come cover the roof. Be certain to include 10%-15% to all your material totals because that trim pin money (waste factor).

Pro Tip: Want to skip doing some math? bespeak a complimentary RoofScopeX aerial roof report to see the size of your roof in squares, as well as the slope (pitch) of your roof. Save the report top top hand because that future conversations v roofers or when reviewing approximates for your following roof instead of or repair.

Ready to obtain an estimate?

Search our list of live independence roofing contractors in the Owens Corning Roofing Contractor Network to discover the roofing skilled that’s ideal for you.

How numerous bundles of shingles per square?

A parcel of roofing shingles is referred to as a bundle. Laminate or architecture shingles, one of the many common varieties of roofing shingles, are typically packaged in three bundles per square.

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

Here room a pair more examples:

A package of shingles is called a bundle. 3 bundles = 1 roofing square (98.4 sq. Ft.)

What about the garbage factor? must I stimulate extra roofing materials?

You desire to bespeak extra material to account because that waste. Waste determinants vary.

10%-15% is a great rule that thumb, however your results might be different. More complex roofs will have actually a higher waste factor because there room usually much more cut shingles roughly corners, walls, and also edges.

It is okay to have actually a few shingles left over. They deserve to be conserved in instance there is roof damage later or if repairs should be done in the future.

So because that the 24 square roof example, girlfriend would want to include 2.4 squares i m sorry equal about 7 or 8 much more bundles.

How lot Roofing Underlayment do I Need?

If girlfriend are also installing underlayment, climate you would require the same amount that underlayment come cover the roof deck.

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

How many squares per roll of underlayment?

The roll size relies on the type of underlayment product. Artificial underlayment comes in 10 square rolls, while continuous #15 felt comes in 4 square rolls.

So because that the 24 square roof example, you would require 2.4 rolfes of man-made underlayment, or 6 rolfes of continuous #15 felt.

24 squares ÷ 10 squares per roll = 2.4 rolls of synthetic underlayment24 squares ÷ 4 squares per roll = 6 rolls of continuous #15 felt

Remember: add 10%-15% for the waste element on underlayment, as well.

Finally, if friend have any kind of questions about your estimate, questioning a roofing contractor in her area. Many will be happy to give you a free estimate.

What’s her roof slope?


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

To identify this, measure up the vertical climb of her deck in inches end a 12″ horizontal distance.

If this increase is 4″, then her roof steep is 4 in 12.

Roof slopes are always expressed with the vertical climb mentioned first and the horizontal operation (12″) stated second.

What if you have a steep roof?

To measure a steep roof, use one of the following alternate methods:

Method 1

Calculate the roof size by measure the exterior walls plus the overhang for the size of the residence parallel come the ridge.

Next, litter a rope over the ridge and also mark it whereby it meets every eave. This will give the width dimension to use in figuring her area. This should be excellent on every roof section containing a horizontal ridge.

Method 2

Determine the roof area by using a math formula the accounts for the roof length, complete span, and roof pitch:

Determine her roof pitch by making use of a key gauge (available at many home advancement stores) or a smartphone app (available totally free through any type of app store).Measure the size of the roof surface, consisting of overhangs.Measure the expectations of the roof, including overhangs.Multiply the length x the span. The an outcome will be the aircraft area. Usage the chart listed below to calculate the full area that the roof.Calculate the total roof area – airplane Area x Correction variable = Roof Area

Slope correction Factor

SlopePlaneCorrection Factor
PitchApproximate AngleMultiply by estimate Length

Roofing Nails

Generally, you should use four nails every shingle in the ar of the roof, and also 5 nails every starter shingle. For consistent three-tab shingles, this would require 320 nails per square for ar shingles. Main point the variety of starter shingles forced by 5 to identify the variety of nails forced to fasten starter course.

For high wind areas or when shingles space being applied to a mansard, 6 nails every shingle are required, or 480 nails per square. This is based on 80 shingles every square.

Other formats of shingles might require an ext or fewer nails every shingle and may have more or much less than 80 shingles every square. Refer to the application instructions on your shingle wrappers for the correct nailing pattern.

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