15 m is a practical maximum gutter length to be served by a downspout.
Smacna gutter and downspout sizing.
The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website.
Gutter sizing per smacna.
The sheet metal and air conditioning contractors national association smacna is now providing a simple and effective downspout gutter sizing calculator.
Smacna s downspout and gutter sizing calculator one of the most frequently asked architectural questions smacna receives is on sizing gutters and downspouts.
In response smacna s technical resources department has created a free downspout and gutter sizing calculator.
To limit the effects of thermal expansion in gutters 50 ft.
It should be used to calculate required gutter size downspout size and downspout spacing for a given roof area.
This tool allows engineers architects designers and contractors to easily and accurately size downspout and gutters per smacna s architectural sheet metal manual.
In response smacna s technical resources department has created a free downspout and gutter sizing calculator.
The sheet metal and air conditioning contractors national association smacna is an international trade association representing 3 500 contributing contractor firms.
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.
Smacna notes that one of the most frequently asked architectural questions the association receives is about sizing gutters and downspouts.