Gutter Pan Slope

When adjusting from 1 12 to 1 20 gutter slope.

Gutter pan slope.

The common design treatment for a road is a concrete gutter that is built to match an asphalt lane. For example if you have 30 feet of guttering the calculation is 1 4 x 3 0 75 i e. This grade adjustment can be accounted for in the patching that is required when replacing old curb and gutter sections. The lower pan is cleated to the roof deck with the indicated clearances determined by expansion calculations.

The slope of the gutter must be transitioned from the standard 1 12 slope to a 1 20 slope. Sectional view of wheelchair at a counter slope condition with grades indicating the algebraic differences and limitations. Figure x02 4 h counter slope conditions. So what s the ideal amount of slope for your gutters.

Second view showing double grade break. For roof slopes less than 6 on 12 the upper roof pan is attached to a locking strip soldered to the lower pan. Most contractors tend to set the slop at one quarter inch per ten feet of guttering. Steep counter slopes will cause some wheelchairs to catch on back rollers and lose drive wheel traction.

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. 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. 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.

There will be minimal grade adjustments necessary where the flatter gutter pan matches the existing street surface approx.