7 Best Of How To Calculate Shingles For A Gable Roof Best Resolution Image. Use a measuring tape preferably 50 or 100 feet long and get exact ground dimensions of your house. Multiply the area by the rafter multiplier that corresponds with the roof slope of your plans.
Measure your roof accurately. 8 inches and you have an 8 in 12 pitch. You also know how ridiculous this is.
To determine the number of squares on the gable roof example in this post divide its total of 2400 square feet by 100 2400.
To determine the number of squares on the gable roof example in this post divide its total of 2400 square feet by 100 2400. Use a measuring tape preferably 50 or 100 feet long and get exact ground dimensions of your house. Measure your roof accurately. 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 levels bottom straight down to the roof.