How To Measure Triangle Roof

The most precise way to find the roof s slope is by measuring it from the underside.

How to measure triangle roof.

To find the area of a triangle you need to know the length of one side the base b for short and the height h. Then multiply the length of the longest side by the length of this central line. Use a level against the underside of the rafter you re measuring to get the most accurate value. The length l times the height h of a triangle is twice its area a2.

Measure out 12 along the level bottom edge the green line in our sketch. So if you divide your answer of a product of length times height by two you will get the area of a triangle. This is because the roof section of a building can be likened to a triangle with a base width a height in. How steep it is in order to apply a slope multiplier.

The calculations for figuring roof angles are based on the width and height of the roof. 1 roof square 100 square feet. Hold the carpenter s level in a horizontal position with one end touching the roof surface. Note that the height forms a right angle with the base.

Mathematicians have no special formula for finding the perimeter of a triangle they just add up the lengths of the sides. First use a ruler to draw a line from the center of the longest side of the triangle the eave to the point the roof s peak. Access one of the rafters then take the measurement this way. This figure shows a triangle with a base of 5 cm and a height of 2 cm.

Divide this number by 2 to get the square footage of the triangle. This procedure to measure roof slope can be performed on the roof or from a ladder at roof edge. Conversely you could measure the roof from the ground using a very rough approximation. Click to enlarge the image.

L 30 feet h 12 feet 30 12 2 180 square feet. In this case you would simply measure the base footprint of your home length x width.