At an angle of 63 4 degrees 2 1.
Minimum roof angle for rain.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
If the run requires two sections of gutter overlap them by 8 inches and use a 3 8 inch long self tapping stainless steel screws or pop rivets in two rows of four each to join them.
This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end.
A 4 12 is a roof slope that rises by 4 inches for every 12 inches across.
This is the basis for calculating the angle which is approximately a 1 19 degree slope.
As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
The pitch of the roof is determined by the vertical rise in inches for every horizontal twelve inch length.
Flat roof slope minimum according to the international building code the typical built up flat roof that uses tar or asphalt goes by the guideline that for every foot 12 inches of a flat roof a minimum of inch must step up or down.
Because that s whats written in the plumbing code.
Minimum slope for asphalt shingles the requirements for an asphalt shingles roof are contained in the international building code.
A flat roof would have a 2 12 pitch while the average roof pitch would be between 4 12 and 9 12.
Pitch is a measure of the steepness of a roof.
This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof.
For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e.
The only logical answer is that the rain must come down somewhere so once in every 100 years the rain comes down onyour building.
A reputable roofing contractor will be familiar with the pitch required by these codes.
I reckon that rain is about 45 degrees.
