Gutter Pan Slope

The slope of the gutter must be transitioned from the standard 1 12 slope to a 1 20 slope.

Gutter pan slope. So what s the ideal amount of slope for your gutters. When adjusting from 1 12 to 1 20 gutter slope. As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering. For roof slopes less than 6 on 12 the upper roof pan is attached to a locking strip soldered to the lower pan.

For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e. Let s explore that further. Gutter counter slope is the angle point or grade change where the down slope of the curb ramp meets the up cross slope of the gutter. The lower pan is cleated to the roof deck with the indicated clearances determined by expansion calculations.

This grade adjustment can be accounted for in the patching that is required when replacing old curb and gutter sections. There will be minimal grade adjustments necessary where the flatter gutter pan matches the existing street surface approx. Steep counter slopes will cause some wheelchairs to catch on back rollers and lose drive wheel traction. See example table 8 8a.

This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end. Most contractors tend to set the slop at one quarter inch per ten feet of guttering. The common design treatment for a road is a concrete gutter that is built to match an asphalt lane. The concrete gutter is oftentimes at a different slope than the asphalt lane and its surface is rarely flush with the lane.

Sectional view of wheelchair at a counter slope condition with grades indicating the algebraic differences and limitations.