![]() ![]() ![]() (Foundation vents for underfloor space ventilation are an exception). When they are more than 3’ but less than 5’ from the line, code limits the openings to 25% of the wall area. The IRC requires that wall openings not be allowed within 3 feet from the property line. Buildings can sit directly on the property line, provided they meet the fire resistance requirements and do not have roof overhangs or exterior wall openings. Walls less than 5’ from the property line are required to have a one hour fire rating. Fire separation distance is measured from the face of the building to the property line, centerline of a street or alley, or to an imaginary line between two buildings.Įxterior walls of dwellings, garages, and accessory buildings must maintain a 5’ minimum separation distance from the property line, or otherwise be fire protected. When designing single family dwelling units, it’s important to remember the fire separation distance requirements.
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