As a rule of thumb there are 3 bundles to a square assuming that you are using three tab strip shingles.
Square area of roof with 9 12 pitch.
To accurately calculate the area of your roof you must first determine its slope or pitch.
Image 1 12 to 12 12 roof pitch 7 12 pitch.
Conventional roofs are the easiest to construct and you can walk on them safely.
A moderate 6 in 12 roof pitch means the roof rises 6 inches for every 12 horizontal inches it runs.
If this isn t practical then perform the same measurement on the underside of the roof.
A 12 in 12 pitch is a steep 45 degree angle roof.
Adding 1 gives us 1 1 9 10 9 then taking the square root gives us about 1 0541.
So keeping with our roof pitch of 4 this gives us 1 9.
100 1 054 105 4ft 2.
They have a pitch ranging from 4 12 to 9 12.
Roof pitch degree table.
1square of roofing covers 100 square feet of roof a bundle is 1.
A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally.
Outside of the u s a degree angle is typically used.
See the image below for more explanation on rise run and pitch.
The first step in a free roofing estimate is measuring the roof dimensions.
A 12 in 12 pitch is a steep 45 degree angle roof.
High pitched roofs often need extra fasteners and their pitch can be as high as 21 12.
Multipliers for common roof pitches that can be used to find the total area of a roof.
Roof is 6 12 pitch and measures at 2 400 square feet so 2400 x 1 12 2 688 2 88 sqs added for pitch.
Pitch multiplier 0 12 1.
Get your roof size by using this roof pitch calculator.
For example a 4 12 pitch roof that is 100 square feet.
Tips on measuring for roofing.
We included a roof pitch chart below the 7 12 example image and the calculator below that.
You can also calculate roof pitch even without using a roof slope calculator.
Roof pitch area multipliers.
Roof pitch is a determining factor for cost of the roof as well as the roof area and the type of materials used.
Add 1 then take the square root.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
These roofs have a pitch less than 4 12.
You will need to express this size in terms of square feet.
A square of shingles is the number of shingles needed to cover 100 sq feet of roof area.