Radon System Installation in San Diego County

Most single-family homes need one. The number is determined by sub-slab communication testing, not square footage. If a vacuum applied at one hole produces measurable pressure change at test points across the slab, one point will serve. Tight soils, footings that divide the sub-slab space, and additions on separate slabs are the three conditions that drive the count higher, typically to two or three.

Above the roof edge, at least ten feet from any window, door, or air intake, and positioned so prevailing wind carries discharge away from the building and neighbors. Discharging at grade or under an eave is not acceptable because the gas can be drawn back inside. On flat roofs the termination is extended high enough to clear the parapet and any adjacent rooftop equipment intake.

Requirements vary by jurisdiction within San Diego County. Electrical work for the dedicated fan circuit is commonly the permitted portion. Any roof penetration should be executed to local code regardless of whether a permit is pulled. Confirming with the local building department before installation avoids a correction notice later, especially in cities with active code enforcement on exterior modifications.

A four to five inch core hole is cut, the pit is excavated beneath it, the riser is set, and the annular space is sealed with polyurethane sealant that remains flexible over time. The finished result is a pipe emerging from a sealed collar in the floor, usually in a garage, closet, or utility area. Structural capacity is unaffected when the core avoids post-tension cables and reinforcement.

Yes, and it is the least expensive path to an active system. Many newer homes were built with a passive stub-out: a sealed pipe from beneath the slab to the roof with no fan. Adding a properly sized fan and manometer converts it to an active system in a few hours, provided the existing pipe is correctly routed and sealed, which is worth verifying rather than assuming.