Higher end laser measurers have the ability. Might take some practice
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Depending on the height/pitch of the roof, there are ones I will not get on to measure. I can tell you I have sold just as many I haven't walked on as I have. Most people understand when it is unsafe.
I have two different ways of doing it. One, I use an App called Measure Map. It measures out the area nearly to the inch then I multiply my factors.
The second goes like this.
1. Length x Widge = Area
2. Determine proper pitch
3. Take area x proper multiply factor, which you know when you find out the pitch.
The factors go like this.
Straight Roofs
Slope Gable / Hip Roof Factor
2/12 1.11 1.15
4/12 1.15 1.19
6/12 1.22 1.26
8/12 1.30 1.34
10/12 1.40 1.44
12/12 1.51 1.55
Cut Up Roofs
Slope Gable / Hip Roof Factor
2/12 1.21 1.25
4/12 1.25 1.25
6/12 1.32 1.36
8/12 1.40 1.44
10/12 1.50 1.54
12/12 1.61 1.65
Those numbers come from this little handy device from CertainTeed. It does not include waste for hip & ridge though
I have two different ways of doing it. One, I use an App called Measure Map. It measures out the area nearly to the inch then I multiply my factors.
The second goes like this.
1. Length x Widge = Area
2. Determine proper pitch
3. Take area x proper multiply factor, which you know when you find out the pitch.
The factors go like this.
Straight Roofs
Slope Gable / Hip Roof Factor
2/12 1.11 1.15
4/12 1.15 1.19
6/12 1.22 1.26
8/12 1.30 1.34
10/12 1.40 1.44
12/12 1.51 1.55
Cut Up Roofs
Slope Gable / Hip Roof Factor
2/12 1.21 1.25
4/12 1.25 1.25
6/12 1.32 1.36
8/12 1.40 1.44
10/12 1.50 1.54
12/12 1.61 1.65
Those numbers come from this little handy device from CertainTeed. It does not include waste for hip & ridge though
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