How To Work Out Pitched Roof Area

L h 2 area calculating an area of a triangle when estimating a roof.

How to work out pitched roof area.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. 8 inches and you have an 8 in 12 pitch. Multiply the area by the pitch multiplier to get the roof s square footage. If you are working out how many roof tiles you need this calculation assumes there is no chimney or other section of the roof not covered by tiles.

In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. Roof pitch refers to the slope which the rafter creates. To get results you need to provide roof base dimensions length and width and roof pitch we assume it is identical for all sides. The length l times the height h of a triangle is twice its area a2.

How to calculate roof pitch. Then take the product of these two dimensions and multiply it by your pitch multiplier. First multiply the length by the width. Rafter rise run from the pythagorean theorem.

All formulae are below the calculator. Roof pitch is given as the number of inches in height change over the distance of one foot. One of users asked us to create calculator which will help him estimate hip roof parameters like rafter s lengths roof rise and roof area. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof.

Rise run pitch where pitch is expressed in percent. Use the appropriate pitch multiplier for each totaled area calculated then sum all the areas. So if you divide your answer of a product of length times height by two you will get the area of a triangle. Divide your roof pitch by 12.

The roof slope height is 6 98m. The number you get will be an accurate estimate of how much area you have to cover for your roofing project. If this distance measures 4 inches you have a 4 in 12 pitch. Dividing by 12 gives the ratio of inches in rise per distance.

Pitch tan angle where angle is the roof pitch expressed in degrees. 1 roof square 100 square feet. Now you re ready to price out the materials. Outside of the u s a degree angle is typically used.

For multi pitched roofs simply add the areas of all common pitches together by toggling layer visibility from the summed layer identified by the eye symbol at the left of the layers control. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Roof width m x roof slope height m half roof area m take this example of a perfectly square house with 76m floor space a 45 pitched roof and a 2 35m roof height.