How do you estimate roof shingles needed?

Calculating the number of roof shingles that are needed when either replacing the shingles or putting down new ones is very critical when determining the extent of replacement and the financial implication in terms of time. An accurate calculation can save both money and effort in under or overbuying. So, How do you estimate roof shingles needed?

This guide provides simple steps on how to calculate the number of shingles necessary!

Step One: Accurate Roof Area Measurement

As your initial step, take an accurate measure of the area covered by your roof.

Break Your Roof Down into Sections

Roofs don’t usually form one flat surface; therefore, each section or slope must be measured individually to accurately represent its area of coverage.

Measure Length and Width in Feet

Use a tape measure to obtain measurements in feet for both length and width, multiply these figures, and then calculate their area to get your total area estimate for each section.

Add All Sections Together

Once all areas of the roof have been measured, add them together to determine its total square footage area.

Step Two: Convert Roof Area to Squares

The amount of shingles that roofers need is normally estimated in terms of squares. A square, which is the area of roofing, is subject to 100 square feet. To make the roof area in squares, divide the total square feet of the area by 100. 

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Step Three: Understand Shingle Packages

Selling roof shingles is in bundles. One pack of roof shingles that would cover 33 square feet total area would be referred to as a package. A single bundle has a coverage area of 33 square feet; hence, to cover the house roof area of 100 square feet, one will need three covering area bundles. 

Step Four: Determine Roof Pitch and Waste Factor

Roof Pitch

The number of shingles required depends on the roof pitch or slope. Higher tones have higher surface areas, hence the shingles may be more needed. More of them are also required on higher-pitched roofs (rating above 6/12), since there is more surface area to be covered, and they will require even more surface area covered.

Waste Factor 

When estimating the cost of installing a roof, it is important to always include 10-15 percent of the total cost to include waste to put into account for waste, unexpected cutting, or errors made in the assembly, and also the damage done when the shingles are replaced.

Step Five: Calculating Valleys and Ridges

Valleys and ridges are areas where two roof sections meet, necessitating extra attention because these locations often necessitate additional roofing material for installation.

• Valley Shingles: Due to their shape, roofing valleys usually require additional shingles than regular sections of roofing.
• Ridge Caps: Shingles for ridge caps can often be cut directly from regular roofing material; however, extra material will likely be necessary.

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Final Calculations

Now that our measurements are made and the pitch has been applied, as well as an extra measure of waste added on top, your final figure in this way should serve as a pretty fair guide to how many shingles it will take to cover our home or building project in roofing.

Tips for Buying the Right Amount of Shingles

When estimating roof shingles, it is always prudent to buy an extra material than you have estimated. The presence of additional shingles may come in very handy in case some of them are damaged in the process of installing them or some tiny mistakes during measurements. To prevent delays in the project, the contractors usually suggest that one or two more bundles should be ordered in addition to the waste factor. One should also purchase every shingle in the same manufacturer batch or the same lot number, if possible. Once the bundles are installed, it can also be helpful to keep additional bundles in a safe place in case of future repair. 

The Bottom Line

How do you estimate roof shingles needed? Estimating how many roof shingles you need doesn’t need to be an overwhelming process. Simply measure your roof area, convert it into squares, and factor waste/roof pitch into your calculations for accurate shingle purchases – without extra trips back and forth from the store! This should allow for efficient roofing projects without unnecessary purchases being needed at every corner.