iphone pitch guage

[John Dirks Jr]

No no no....you should not have asphalt shingles on this roof section.

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[Erby]

For accuracy, shouldn't it be ON the shingles.

[John Dirks Jr]

For accuracy, shouldn't it be ON the shingles.

To some degree, not necessarily. The shingles don't always follow the same exact pitch considering the way they overlap each other. The trim under the edge is basically representing the pitch of the roof surface.

I also used an angle gauge on the shingles.

2:12 = 10% so less than 10% should not have asphalt shingles.

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[Steven Hockstein]

I tested my pitch gauge app with a 45 degree triangle and it did not read 12 on 12. Be careful when using this to check a roof pitch. Use a level and a ruler or You can also use an angle finder like this:

http://www.homedepot.com/buy/johnson-pi ... r-750.html

Edit-You beat me to it!

[John Dirks Jr]

I've found that the iphone app that I have works pretty good. It has a calibration feature where you position it on a level and set it to 0.

[Nolan Kienitz]

JD,

Is that the one from the "Carpenter" APP?

I inspected a house for an architect recently and he uses the "Carpenter" APP that has some routines in it.

It has a calibration routine as well. I've not used it yet, but was putzing with it a few weeks ago.

[rkenney]

2:12 is 7.5 degrees. I don't know what your 10% (% is the percent sign) refers to. So looking at your angle gauge in the second post you have a 2:12 roof. If they're the right shingles with cement it is an appropriate use.

[John Dirks Jr]

The one I have is Pitch Gauge 2.1 by Prolific Methods LLC

It also has a built in calculator for material estimates and the like.

Another cool feature is a camera function that shows the pitch reading in the frame. (gotta pay 99 cents for that version)

Don't bother trying to measure the angle of the photo in this post. The computer screen was tilted back so the angle represented is misleading.

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[Marc]

2:12 is 7.5 degrees. I don't know what your 10% (% is the percent sign) refers to. So looking at your angle gauge in the second post you have a 2:12 roof. If they're the right shingles with cement it is an appropriate use.

9.46 degrees

Arctangent (OPP/ADJ) = Arctan (2/12) = 9.46 degrees

Marc

Pardon the math. I can't help myself.

[John Dirks Jr]

2:12 is 7.5 degrees. I don't know what your 10% (% is the percent sign) refers to. So looking at your angle gauge in the second post you have a 2:12 roof. If they're the right shingles with cement it is an appropriate use.

How do you figure that?

The scale on my pitch gauge doesn't say that. Here's the pic of it.

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[John Dirks Jr]

2:12 is 7.5 degrees. I don't know what your 10% (% is the percent sign) refers to. So looking at your angle gauge in the second post you have a 2:12 roof. If they're the right shingles with cement it is an appropriate use.

BTW, you are correct in pointing out that I used the wrong symbol to represent degrees.

However, 10 degrees is a heck of alot closer to 2:12 then 7.5 degrees is.

[rkenney]

12:12 is a 45 degree angle, half of that is 6:12 (22 .5), etc. etc.

Point is, your protractor doesn't resolve to that accuracy (much less 9.46).

Eyeball works much better, and unless you can find something more substantial to condemn the roof covering you are splitting hairs.

[Marc]

12:12 is a 45 degree angle, half of that is 6:12 (22 .5), etc. etc.

6/12 is 26.56 degrees. It's a tangential function, not linear. Error increase as.....never mind.

Marc

[John Dirks Jr]

http://answers.yahoo.com/question/index ... 945AA9XHWQ

[John Dirks Jr]

12:12 is a 45 degree angle, half of that is 6:12 (22 .5), etc. etc.

Point is, your protractor doesn't resolve to that accuracy (much less 9.46).

Eyeball works much better, and unless you can find something more substantial to condemn the roof covering you are splitting hairs.

I've been writing up this condition for 5 years. Dozens of times and I've never been challenged by anyone. I've had owners call their roofer while I was onsite. The roofer always responded with "I'll fix it".

Here's the building code that backs up the deficiency.

http://publicecodes.cyberregs.com/icod/ ... par020.htm

[John Kogel]

Thanks, guys. I'm convinced now I'll just stick to a straight edge and a tape.

Why? Because percentages and degrees are for eggheads who wouldn't dream of setting foot on a roof. Sorry, Marc, no offense intended there. []

Rise in Run, the roofer will get it, no debate.

The app is cool, but I guess first step is to buy the phone ..... and my Motorola flip phone is still good.

John is right, 2 in 12 is the minimum for shingles and even then it makes for a pits poor roof.

[Erby]

Math, ugh. Making my brain hurt!