Wet Basement in Boise, ID

Addressing a wet basement often involves a combination of specialized procedures and equipment. For interior water management, we may install an interior perimeter drain, which involves saw-cutting the concrete slab, trenching the footer, laying perforated PVC pipe bedded in washed gravel, and tying it into a sump pit before patching the slab. A submersible sump pump is then seated in an excavated pit below the drain tile, with a check valve installed on the discharge line to route water away from the foundation. For exterior protection, we can excavate to the footer, clean and dry the wall, apply a liquid-applied waterproofing membrane or rubberized coating, and install an exterior drainage board (dimple mat) to direct water to a footing drain before backfilling with gravel. Cracks in walls can be addressed with epoxy or polyurethane crack injection, where entry ports are drilled along the crack, and resin is injected under low pressure to fill voids through the full wall thickness. For dampness, a vapor barrier / polyethylene sheeting can be installed on the floor, with seams overlapped and taped, and the perimeter sealed to the wall with mastic. The total cost for full basement waterproofing projects typically ranges from $2300 to $10000, with individual services like sump pump installation costing $490-$2500 and epoxy crack injection ranging from $250-$1000.

The local soil conditions in Ada County, particularly the dominant Chance (FSL) series with its very poorly drained drainage, can contribute to hydrostatic pressure against basement walls and foundations, making effective waterproofing crucial. The secondary Kunaton (SIL) series, while well drained, does not negate the challenges posed by the dominant soil type. When undertaking basement work, Ada County Building Division requires footing inspections, and inspections must be requested the day before by 4:30 PM via phone or before midnight via email. While rebar in footings and foundations is not always required unless part of an engineered design or geotechnical report, a foundation inspection is necessary if rebar is placed above code minimum and is on approved plans, required by an engineer, or part of a geotechnical report. Additionally, any basement emergency escape openings must meet specific requirements, including a clear openable height of at least 24 inches, a clear openable width of at least 20 inches, and a clear openable area of 5.7 sq ft or more (or 5 sq ft for below-grade openings), with the sill no more than 44 inches from the floor. Window wells, if applicable, must have a horizontal area of at least 9 sq ft and a projection width of at least 36 inches, allowing the escape opening to open fully.