Surface Area Of The Roof

While it is possible to estimate the amount of necessary materials using only the total roof area measurement as can be seen from the table depending how large the pitch of the roof the actual area of the roof can differ by up to 2 236 from the measured total area at a pitch of 24 12.

Surface area of the roof.

Place the other end of the level at the peak of the roof and hold it level. The area is based on the footprint of the roof which can be calculated by finding the area of the building and adding the area of the roof s overhang. Take the area of the roof s footprint say it s 5 000 square feet and multiply 5 000 by 1 118. The length l times the height h of a triangle is twice its area a2.

The base width is the distance from one corner of your roof to the other at its base on the short side of your house. Roof pitch is given as the number of inches in height change over the distance of one foot. Divide your roof pitch by 12. L h 2 area calculating an area of a triangle when estimating a roof.

To calculate the area of your roof first you ll need to calculate the pitch of it. 1 roof square 100 square feet. After drawing the perimeter of the roof add a new drawing layer with the plus symbol found in the bottom right corner. So the actual roof surface if it were laid down flat on the ground would be 1 118 times larger than the footprint of the roof.

Our roof calculator uses base length and base width to find the estimated area. First use your measuring tape to measure 12 inches on your large level and make a mark at the 12 inch line. Calculate the surface area of the roof. So if you divide your answer of a product of length times height by two you will get the area of a triangle.

And for a roof with a slope of 6 12 that number 1 118 is your roof slope multiplier. Next place your ladder against your house at the gable end. Measure the distance from the surface of the roof to the bottom of the level at the 12 inch mark. The image below shows how differences in roof slope do not change this building s catchment area.

Online calculators and formulas for a surface area and other geometry problems. Using dormer windows as an example you ll add a new layer after drawing each dormer. Area is defined as the expanse or measurement of a given surface and there are a few methods for measuring your roof s area. Climb to the top of your roof.

This distance is the rise. Calculate the unknown defining side lengths circumferences volumes or radii of a various geometric shapes with any 2 known variables. Dividing by 12 gives the ratio of inches in rise per distance. For example if your measurement is seven inches the rise is expressed as 7 12 in roofing terminology.