How to Measure for Shingles on a Roof
You should measure the roof surface area prior to purchasing any materials. This will allow you to ensure that your house has enough roofing materials in order to cover all the roof planes.
Install your ladder safely before you begin measuring. Next, you can take a tape measure and notepad on the roof to make your measurements.
Measure the roof planes
As you climb the ladder up to your roof, make a sketch of the roof from above in a small notepad. The sketch need not be exact, but you should be able label the planes of your roof as you take measurements.
Measure the length, width, and overhangs of each roof plane. Once you know the dimensions of each plane, multiply the area by the pitch. If the roof has a flat top, you can simply multiply length times width. This will be more difficult if the roof is a gabled one. You'll need to use a trigonometric formula.
You can then add the square footage for the entire roof. This will enable you to calculate how many bundles to purchase. If you are using metal roofing, it is important to consider the size of both the panel or sheet as well as the roof area.
Measure the roof's square footage
As soon as you are ready, place a long ladder at the base. It is best to have someone else hold the ladder steady so you can take your measurements. You can use a measuring tape to determine the length and breadth of each plan. Mark these dimensions onto a diagram showing the layout of your roof. You should not round up or down the measurements, as it will mess with your calculations.
To calculate the width in feet of your shingled roof, you would count the number shingles rows along the eaves. Multiplying the roof's height by its width will give you its square footage. Repeat these steps to calculate the square footage of each plane. Don't forget peaks, dormers and valleys as well surfaces without shingles. Calculating the total square footage of your roof will require you to take into consideration these areas.
Measure the roof's Eaves
In the case of basic gable and Hip roofs, you will need to calculate each plane's square footage. The risk of counting each section is high, but if you have a partner or notepad on the ground, it's easy to calculate the area.
Begin by measuring the length of the roof from the gutter up to the edge. You can start your calculation by writing that measurement down in inches.
Use the same method to measure each rafter under the eaves. This figure is added to the roof base length to determine the overall roof size. Use the chart below for the shingle-calculator to determine the "roof slope". Multiplying the square footage of each plane by its length and width will give you the roof's slope. To find the number of bundles needed, multiply 29 by that number (the average number standard shingles).
Measure the Roof's Ridges
You need to calculate the area of your roof's shingles before buying enough materials. Most people are unable to determine the area of a roofing surface without climbing up onto it.
Google Earth provides the easiest method to calculate the roof's total square footage. You can view your property safely from the ground while viewing it in bird's-eye.
Measure the distance from the edge to the peak. This is the horizontal length of the roof. Measure the height of the roof from the ridge top to the edge of the eaves with your tape. This is the vertical rise or pitch of your roof. To adjust the pitch of your roof, use the appropriate multiplier listed below.
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You should measure the roof surface area prior to purchasing any materials. This will allow you to ensure that your house has enough roofing materials in order to cover all the roof planes. Install your ladder safely before you begin measuring. Next, you can take a tape measure and notepad on the roof to make…