![]() ![]() ![]() (See Figure 1.) Once inside, this moisture can lead to a variety of problems, including mold and rot. If not drained away from the house, the immense volume of water coming off the roof can quickly saturate the soil surrounding the building and wick through the foundation to the interior. This runoff must be channeled away from the building foundation to keep the basement or crawlspace dry and to prevent water from seeping into the building interior where it may create moisture problems. DescriptionĪ few inches of rain falling on the roof of a house can produce several thousand gallons of water runoff ( EPA 2015). See the Compliance Tab for related codes and standards requirements, and criteria to meet national programs such as DOE’s Zero Energy Ready Home program, ENERGY STAR Single-Family New Homes, and Indoor airPLUS. above the final grade (e.g., brick veneer or stone cladding over a self-adhering moisture control membrane and air gap). Use cladding material that can tolerate regular wetting and install a well-sealed, continuous drainage plane that extends at least 16 in.away from the edge of the foundation wall and maintain siding clearance above grade at least 8 inches OR Design the home with overhangs to provide a drip line that is horizontally 16 in.Extend the foundation walls at least 16 in. ![]() (See the Compliance Tab for other ENERGY STAR exceptions.)įor homes without gutters, install protection from water splash damage (per EPA Indoor airPLUS) in one of the following ways: Or, construct a grade-level rock bed with a waterproof liner and drain pipe to collect water that drains from the roof.ĮNERGY STAR does not require gutters for homes that have a slab-on-grade foundation or are in a dry climate.Or, install a rainwater harvesting system that includes a drainage system to handle overflow.from the foundation that is not connected with the foundation drain system ( EPA Indoor airPLUS). from the foundation or to an underground catchment system ≥ 10 ft. Connect the downspouts to piping that will carry the water to a sloping final grade ≥ 5 ft.Install adequately sized gutters and downspouts.Install gutters and downspouts on homes to direct rainwater down and away from the home, to reduce the chances of saturating the soil around the foundation. ![]()
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