Gutter Pan Slope

The common design treatment for a road is a concrete gutter that is built to match an asphalt lane.

Gutter pan slope.

Sectional view of wheelchair at a counter slope condition with grades indicating the algebraic differences and limitations. 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. When adjusting from 1 12 to 1 20 gutter slope. There will be minimal grade adjustments necessary where the flatter gutter pan matches the existing street surface approx.

The slope of the gutter must be transitioned from the standard 1 12 slope to a 1 20 slope. So if you have a 25 foot section of guttering you should set the downspout end of the gutter 5 8 of an inch lower 1 4 x 2 5 5 8 than the other end. Let s explore that further. The lower pan is cleated to the roof deck with the indicated clearances determined by expansion calculations.

For roof slopes less than 6 on 12 the upper roof pan is attached to a locking strip soldered to the lower pan. So what s the ideal amount of slope for your gutters. This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end. Steep counter slopes will cause some wheelchairs to catch on back rollers and lose drive wheel traction.

The concrete gutter is oftentimes at a different slope than the asphalt lane and its surface is rarely flush with the lane. Figure x02 4 h counter slope conditions. See example table 8 8a. As a general rule gutter slope is set at 1 4 inch per 10 feet of guttering.

Most contractors tend to set the slop at one quarter inch per ten feet of guttering.