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24.4 Sealants for Through-Wall Penetrations

Utility penetrations through foundation walls should be carefully sealed on the exterior face of the wall prior to placement of waterproofing materials and backfill. High-quality urethane caulks are most suitable for this application. In addition, the wall construction should be inspected for penetrations due to voids or other problem areas (such as form ties), and appropriately repaired and sealed.

Inspection Tips

Check for water damage and rot at horizontal surfaces, including windowsill areas and door tread areas. The bottom corners of the side jambs at windows and doors are important areas to inspect. You can use the handle-side of a screwdriver to tap on wood to listen for soft-sounding areas that may be damaged.