I would doubt the roof is straight enough to guarantee that there will not be low places that will collect with that slope.

A flat roof is not really flat.
 
NO. In a heavy rain it will come through seams. Also if snow is a concern it will not slide off. Which will not only put weight on roof but it will pool when it melts and come through seams.
Sod Buster
 
You don't really want to go less than a 3-12 roof if it is out of typical metal.

Even a real 'flat roof' of membrane or soldered metal or the like needs to be 1/2-12 which I think is close to where you are at?

Paul
Roof slope
 
I've seen roofs made of aluminum in Florida. Pitch may be 1 ft in 10 feet. Leafs and pine needles built up on roof and gutters. Heavy rain, Water can't get off fast enough. Then the entire roof collapses. I've seen that happen a few times.

My concrete finisher likes to have a minimum of 1 inch in 10 ft.
 
If the center of the roof sags a bit, water will pool at the low spot, causing the roof to sag more, etc. Eventually the roof will either leak at the seams or collapse. San Diego, CA may not get enough rain to test it for a few years.

I find most often building codes and permits protect the 2nd and 3rd owner of that property much more than they protect the first guy getting the permit.
 
lot more variables at play. i have 15" i-joices hold up my roof and have the same slope, with no problems
 
Thanks for the reply's. Looks like I should lower one end some. I can get another 3 1/2 inches, by placing my rafters lower. Just trying to get a little more head room at the lower end. Just a shed roof to keep junk in
 
I have a 2 12 pitch on my 24 x 48 shop (slopes 4" over 24') with a sheet metal roof, no leaks. With roof slopes its always something like 3 12, 4 12, etc (3" slope over every 12' of roof)
 
For an idea, asphalt 3 tab shingles recommend a minimum of 3/12...that't 3' rise in 12' of span to keep water from backing up under them.
 
you can go down to a 2 on 12 pitch on 3 tab shingles if the underlayment is 30 lb felt with an 18 inch overlap--i also use 6 nails per shingle
 
(quoted from post at 18:44:11 07/16/18) I have a 2 12 pitch on my 24 x 48 shop (slopes 4" over 24') with a sheet metal roof, no leaks. With roof slopes its always something like 3 12, 4 12, etc (3" slope over every 12' of roof)

You have close to a 3/16 / 12 pitch. Pitches are expressed in inches per 1 foot of run. A 3/12 roof drops 3" for each foot(12") of horizontal run.
 
Yes and no. It will drain but would be vulnerable to leaks at the seams. You would have to be very thorough making completely water tight seems in the metal. Use a heavy bead of gutter and flashing caulk and you should be alright.
 
WRONG!!!!!!!!!!!!!!!!!

A 3/12 pitch is 3 feet rise per 12 feet run. Or 3 inch rise per 12 inch run. Both dimentions MUST be given in the same unit!!<
>PTFarmer is also wrong.
Texmark has it right.

Willie
 

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