So no gutters are not required by code but positive drainage away from a building foundation while controlling erosion is required by code.
Are rain gutters required by code.
Today the international code council icc interpretation mentions that a post tension slab on grade foundation built on expansive clay is not required to collect water at the roof and discharge it at the ground put it in a gutter.
They are generally not required by law on a sloping roof and many modern homes omit them even in instances where they are beneficial.
Gutters are not required by the international residential code irc or the residential edition of the florida building code fbc with two exceptions.
Some roofers even advise against them.
General inspection and maintenance of gutters and downspouts.
2 if the home has a footing and foundation wall not a thickened edge concrete slab foundation like most newer homes and is in an area that has expansive clay or collapsible soils.
Local codes may require that drainage systems only be designed for the latter.
See ubc 1806 5 5 suggesting alternate methods possible.
If gutters slope too severely they don t hold water and water could splash over the sides in heavy rain.
The wikipedia article on gutters provides an accurate overview.
If gutters don t slope water gathers in them.
However in areas like san diego orange county and other parts of southern california we are often praying for rain and do not seem to get enough rainfall to cause builders to automatically add a.
The gutter slope also called the pitch is the amount the gutter tilts down to let rainwater flow out of it.
Available on the upcodes website.
1 if the roof overhang eave is less than 6 inches.
1106 6 size of roof gutters from the 2018 international plumbing code.
Rain gutters are the most controversial type of gutter.
How that is easily achieved in our area is by use of gutters and downspouts.
In order to decide for yourself whether rain gutters are necessary for your home it is best to first weigh the facts.
The amount of collected water increases until it spills over the sides of the gutter.
Averaging about 1 2 inch deep rain run off has washed roof granules down the flow line of the gutter.
Chapter 8 code of miami dade county requires that roof slope drains gutters crickets and overflow scupper calculations appear on the framing plans.
See ubc 1804 7 no distance indicated.
In many parts of the country rain gutters are an absolute must and are integral in keeping water out of basements and preventing damage to homes.
Downspouts and gutters are sized in relation to rainfall on this basis.
From my cursory knowledge of building code gutters are never explicitly required although r 801 3 requires some controlled method of drainage 5 ft from the foundation walls or to an approved drainage system.
