For instance if the roof is 1550 square feet then it is 16 squares.
How to figure square footage of roof for slate.
Ft and deduct 20 sq.
Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100.
Multiply the length and width of each square or rectangle shaped plane.
The top ridge will be shorter than the one of the gable roof but the four hips will add.
As an example if your overhang is 12 inches you ll add 2 feet to the overall length and 2 feet to the overall width of the house.
In cases where a roof has a complex shape such as in the image to the right measuring the dimensions and areas of each part of the roof to calculate total area will result in a more accurate measurement of area.
If you measured in feet skip to calculate the area as square footage.
This nominal square footage amount is then multiplied by a factor associated with the roof s pitch.
Per square smaller roofing slates actually weigh more than larger slates and come in at around 800lbs square while larger slates 12 24 weigh about 700lbs square.
If you measured in another unit of measure do the following to convert to feet.
We now know that face 1 of the roof is x x y which is 40 metres squared 40m2.
Include areas of dormer roofs sides of dormers if slated slate saddles or any other places where slate is used in addition to the main roof area.
How to calculate square feet of a roof.
If you measured in feet inches divide inches by 12 and add that to your feet measure to get total feet.
The answer is the number of roofing squares for the roof.
On average slate measured at approximately 1 4 inch thick weighs between 700 and 800 pounds per square.
Measure your house at ground level then add in the roof s overhang for greater accuracy.
Convert the area to roofing squares.
Less than actual area if more than 80 sq.
Calculate each plane separately.
The only difference in this calculation to the one for a gable roof area is the amount of the ridge.
To find the squares divide the overall roof area by 100 and then round up.
As there are 2 sides to a standard up and over roof you can simply multiply each side by two therefore 40m2 x 2 80m2.
It depends on the size of the slate.
A square simply refers to a 10 x 10 square of roofing.
The calculator cannot account for complex shapes based on a measurement of square footage alone.
Roof pitches in degrees.
Convert all of your measurements to feet.
Although roofing projects are estimated and sold by the square roofing material is often not sold in 1 square increments.
Include dormers the small outjuttings over attic windows.
Included overhanging parts of dormers etc.
Calculate the square footage area of a hip roof.
Measure the length and width of every roof plane or surface.
Again for the sake of this article let s say this is 10 linear metres.
Deduct one half of the area of chimneys and dormers if over 20 sq.
