How To Measure A Roof From Blueprints

Measuring a roof of blueprints.

How to measure a roof from blueprints.

First measure the length and width of each surface on the roof then multiply these values to get the square footage of that surface. I guess square feet x pitch factor would also work the same. Make sure to document the number of chimneys skylights or other obstructions and include dormers in your measurements. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.

For square or rectangular roofs you ll only need to record the length and width. Already subscribed to the iroofing app. 1 roof square 100 square feet. On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof.

Outside of the u s a degree angle is typically used. Notice the bold dotted line this dotted line separates the main roof from the gable pop out on the front of house. To measure pitch first position the hypotenuse of the square on the roof running straight up the pitch. 8 inches and you have an 8 in 12 pitch.

As was said before. If this distance measures 4 inches you have a 4 in 12 pitch. Extend your tape measure along the outer edges of the roof to find its length and width in feet. With this method only 2 calculations are needed.

Measure each side of the main section of the roof. The length l times the height h of a triangle is twice its area a2. Make sure it s not off angle because of the shingle edges. How to measure a hip roof from blueprints don t be so thinned skinned man it s not that big of a deal.

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. Select the blueprint you wish to measure. The easiest and most accurate method to measuring a roof plan is to square everything off. Here s a step by step guide to measuring with blueprints.

So if you divide your answer of a product of length times height by two you will get the area of a triangle. If the roof is a very simple dormer or hip roof with no valleys then you d take width x pitch factor x length squares. This means that you want to divide the roof into sections. Looking at the triangle that the roof plane looks like on the plans you multiply the base the long part of the triangle by the height of the triangle the peak of the triangle down to the base then divide that in half.

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