Outlet sizing and spacing your gutter system will perform its best when a proper outlet size is chosen to drain a given roof area.
Typical residential gutter size.
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.
When you are completing a gutter replacement the first point to note is that gutters come in different sizes.
This type of down spout is considered the standard downspout style in households and is used with a 5 k style guttering system.
Half round and k style gutters are the two most common gutter types found on residential homes.
Downspouts also come in different sizes such as 2 3 inches and 3 4 inches in size.
Furthermore the standard norm for gutters among many in the rain carrying industry is to allow 1 square inch of outlet opening in the gutter for every.
Each gutter style comes in two sizes and each has the capacity to.
Round downspouts come in various sizes and colors and mostly used with half round gutters.
The sizes available in this style are 3 4 5 and 6.
Most residential gutter systems use 5 gutters or 6 gutters.
Downspout sizes must not exceed the bottom width of the gutter.
Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.
They can be 4 5 or 6 inches.
But houses with big steep roofs or those located in climates prone to heavy downpours may need wider gutters and extra downspouts to keep.
The definitive guide to gutter sizing five inch k style gutters or 6 inch half rounds the most common residential sizes are able to handle the rainfall on most houses in most parts of the country.
A standard 5 inch k style gutter can handle annual rainfall for a majority of houses in most of the u s.
You can also add additional or oversized downspouts to improve drainage if necessary.
It also comes in sizes 2 3 and.
Residential sizing samples are available to check the optimal fit but in most cases the 5 half round gutter requires standard gutterbrush for 5 gutters 4 25 dia while the 6 half round gutter requires oversized gutterbrush for 6 gutters 5 25 dia.
A larger size gutter system will generally be more expensive.
The downspout and gutter sizing calculator is located on the tools cad and apps page of the smacna website.
How to size gutters downspouts.
If a roof s various drainage areas call for different size gutters go for the biggest one k style.
The size of the gutter should never be selected for the amount of water it can hold gutter size refers to the opening at the top of the gutters and not to the depth of the gutter channel.
