Box Gutter Fall Ratio

Rainhead overflow or specific box gutter overflow must be at least 30mm below the height of the back of the box gutter.

Box gutter fall ratio.

The minimal slope needed for proper gutter drainage is 1 25 cm 1 4 inch for every 3 metres 10 feet of gutter. Multiply the number of feet by 1 16 inch to determine the total slope the gutter requires. This effectively states that all box gutters must allow for 30mm of freeboard which is from the overflow point eg. The standard is about inch per 10 feet.

There is always some confusion as to how the slope affects the overall depth. This means the downspout end of the gutter should be set 3 4 of an inch lower than the other end. Next place a ladder at the left side of the house and measure from the roof down to the gutter. Required gutter slope 1 40 to 1 200.

Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run. I fall or slope box gutters to be installed with a minimum uniform fall of 1 in 200 towards the outlet. Minimum width 300 mm for commercial construction and 200 mm for domestic construction. Box gutters allowable width slope and length.

Calculate the gutter slope by dividing the length of the gutter needed by 10. Measure the length of gutter needed.