Box Gutter Overflow Design

To use the gdo calculator enter information about the location roof design and types of overflow measures.

Box gutter overflow design.

Failing to install appropriately designed box gutters and correctly sized and positioned overflow devices can lead to serious damage to buildings and contents especially in shed and flat house roof designs often resulting in hefty insurance claims which are a total burden. The box gutter depth and the sump length are influenced by the size of the overflow. Overflow devices need to discharge to the atmosphere in such a way as to prevent damage to buildings and property. Drill rivet holes for the gutter splash guard.

A rainhead or sump is a container located between the gutter and downpipe that aids the flow of water away from the roof. The hydraulic capacity of an overflow device shall be not less than the design flow for the associated gutter outlet. Holes through the splash guard and the gutter. There will also be an overflow facility on the side or the end.

You can find these precut gutter splash guards about 3 in brown and white aluminum at a home center but you could easily make your own out of aluminum or sheet metal and spray paint them to match your gutters. However a wider overflow may increase the length of the sump. Overflow devices shall discharge to the atmosphere. The gutters downpipes and overflow gdo calculator assists in developing a better understanding of the ncc volume two part 3 5 3 gutters and downpipes acceptable construction practice acp provisions.

A wider overflow needs less depth of overflow hence the box gutter depth will also be reduced. The hydraulic capacity of the overflow device must be no less than the design flow for the associated box gutter outlet. A box gutter is defined as a graded channel generally of a rectangular shape for the conveyance of rainwater within the building footprint including adjacent to a wall or parapet. Overflow provisions rain shadow roof slopes how to find rainfall intensity how to calculate the area of any catchment how to find the hydraulic grade of charged pipes how to design box gutters using the code how to use the extra features of the dp calculator box gutters allowable width slope length other plumbing codes how to exceed the.

Rainheads are an essential design element for buildings where internal box or trough gutters are used. Sump with a side overflow device.