Formula For Firuring Out Roofing Materials

Calculate framing and decking for a roof.

Formula for firuring out roofing materials.

1 roof square 100 square feet. Simply enter your roof dimensions and roof type such as gable or hip and approximate roof pitch. You can also calculate roof pitch even without using a roof slope calculator. Use the following formula which also describes a right triangle.

Figuring out the roof area is the first step to determine how many bundles you ll need to order. Roofing contractors estimate projects and materials by the square so it is crucial to find this measurement to accurately estimate the amount of material needed. There are two ways to size up a new or freshly stripped roof. In the roofing trade this is known as the installation cost and it can vary widely depending on the type of replacement roof that you are getting.

Shingle roofs typically have a life span of 15 30 years while membrane roofs usually last 5 15 years. This is simply 100 square feet of roof. The length l times the height h of a triangle is twice its area a2. There s a third method for calculating bundles when you ll be laying new shingles over old or if the old roof is still in place.

The measurement method and the sheet count method. To estimate roofing materials start by finding the total square footage of the roof and divide the number by 100 to determine the number of squares in the roof. Our calculator will help you estimate the amount of roofing shingles needed for your project plus the cost of materials and accessories. But keep in mind that materials typically only account for 40 of the total cost of square roofing.

Divide the entire length of the roof by 2 feet to find out how many rafters you ll need to frame the roof. For roofing designs that are more complex it is a bit more challenging. To find the squares divide the overall roof area by 100 and then round up. Since it takes 3 bundles of shingles to cover a square plan to purchase 3 bundles for each square.

The other 60 is labor. Rafter rise run this formula is from the pythagorean theorem. For basic roof designs this is a fairly easy task to accomplish. Here are the equations you may use to solve for the length of the slope and the rafter.

Once you work through the basic triangle we will review a typical roof and how to apply some simple math to calculate how much material you will need for a roof used in our hypothetical example. For the decking multiply the length by the width of the roof convert to inches and divide by 32 the square feet of one sheet of plywood. The most common roofing materials used in the united states include shingles membrane roofing and ceramic tile all of which have different life spans. Calculating the roofing materials needed for your home or business requires an understanding of the geometry and the ability to complete some basic math problems.