Smacna Gutter And Downspout Sizing

This application runs the equations laid out in the smacna handbook.

Smacna gutter and downspout sizing.

Offset of more than 10 ft 3 0 m can affect drainage capacity. The sheet metal and air conditioning contractors national association smacna is now providing a simple and effective downspout gutter sizing calculator. The size of the downspout should be constant through out its length. In response smacna s technical resources department has created a free downspout and gutter sizing calculator.

This calculator serves as an information source only. For additional information please see below. Jointly developed by aia smacna. Now architects engineers designers and contractors can easily and accurately size downspouts and gutters according to the specifications in smacna s architectural sheet metal manual 7th edition 2012.

Gutter sizing per smacna. Downspouts should be constructed with conductor heads every 40 ft 12 2 m to admit air and prevent vacuum. To limit the effects of thermal expansion in gutters 50 ft. Technical gutter sizing northshore exteriors inc.

The capacity of a sloped rectangular gutter may be approximated by using a gutter cross section area not less than that of a semicircular gutter and a depth to width ratio of at least 0 75. This tool allows engineers architects designers and contractors to easily and accurately size downspout and gutters per smacna s architectural sheet metal manual. Downspout style sizing expansion allowances fastening method selection flashing requirements. Smacna notes that one of the most frequently asked architectural questions the association receives is about sizing gutters and downspouts.

The downspout size must suit. In response smacna s technical resources department has created a free downspout and gutter sizing calculator. In response smacna s technical resources department has created a free downspout and gutter sizing calculator. Metal era recommends that you verify all data obtained.

The gutter outlet capacity should suit the downspout capacity. Figure 1 2 rectangular gutter styles. It should be used to calculate required gutter size downspout size and downspout spacing for a given roof area. Downspout sizes must not exceed the bottom width of the gutter.

This calculator uses the equations that are laid out in the smacna handbook. Smacna s technical resources committee completed wind uplift testing on custom fabricated fascia and coping architectural elements constructed in accordance with the smacna architectural sheet metal manual.