Gutters come in different sizes.
Standard gutter size nz.
Made form galvsteel zincalume colorsteel.
They can be 4 5 or 6 inches.
The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website.
Gutter sizing step 1 determine roof area to be drained.
The type of gutters you buy and the size of the gutter pieces you buy should be able to handle all the rain your home gets in a year.
Downspouts also come in different sizes such as 2 3 inches and 3 4 inches in size.
Then use the chart below to see what size gutter you need.
A standard 5 inch k style gutter can handle annual rainfall for a majority of houses in most of the u s.
New zealand building code clause e1 table 5.
The largest plan area is area a at 38 m.
This ensures the gutter will have sufficient capacity for all other smaller roof sections on the building.
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.
You can also add additional or oversized downspouts to improve drainage if necessary.
It s important to note that your calculations should always be based on the size of the largest section of roof.
Gutters come in different sizes.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
For saf perimeter systems commercial gutter designers contractors and building owners this gutter sizing section provides 4 steps to properly size a commercial gutter downspout configuration.
Gutters will be the same size for all the roof so use the largest plan area to work out the appropriate size gutter.
5 inch 5 520 square feet.
6 inch 7 960 square feet.
Nz s leading provider of steel roofing guttering products for residential commercial customers.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
Gutter sizing guide gutter downspout sizing methodology.
Work out the minimum gutter capacity or cross sectional area required and use this to select the right gutter.
