Smacna Standards For Gutters

News smacna s downspout and gutter sizing calculator.

Smacna standards for gutters.

Now architects engineers designers and contractors can easily and accurately size downspouts and gutters according to. In response smacna s technical resources department has created a free downspout and gutter sizing calculator. As with gutters a downspout s capacity must match or exceed the expected runoff. The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website.

The sheet metal and air conditioning contractors national association smacna is now providing a simple and effective downspout gutter sizing calculator. The above recommendations assume that you have properly sized downspouts every 40 feet. The smacna series gutter system is an exceptionally strong gutter product for industrial commercial type buildings. Ansi the american national standards institute has accredited smacna as a standards setting organization.

Area and flow in table 1 4 are based on 1 in 25 mm of rainfall per hour. Saf smacna gutters are an extension of the saf industrial series gutters but with profile features contained in the sheet metal and air conditioning contractors national association smacna manual. Expansion allowances gutter specific expansion tables based on girth profile metal predicted annual δt expansion of building materials table with various expansion coefficients must be used for fascia and copings with consideration of both metal and substrate flat seam roof expansion guidance over 30 feet use batten seam design to allow for expansion. The standard is about inch per 10 feet.

Divide these areas by the local rain fall rate in inches per hour to determine the actual roof area to be served by the gutter diameter. Increasing the pitch increases a gutter s handling capacity but the gutter may look askew over a long run. Smacna standards and manuals address all facets of the sheet metal and hvac industry including duct construction and installation indoor air quality energy recovery roofing and architectural sheet metal welding and commissioning. In response smacna s technical resources department has created a free downspout and gutter sizing calculator.

One of the most frequently asked architectural questions smacna receives is on sizing gutters and downspouts. 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. From chart 1 2 it is determined that a 9 5 in 241 mm half round gutter should be used. This tool allows engineers architects designers and contractors to easily and accurately size downspout and gutters per smacna s architectural sheet metal manual.

Smacna downspout gutter calulator.