Exterior Basement Waterproofing in Ann Arbor, MI
Exterior basement waterproofing is a comprehensive solution designed to prevent water intrusion by addressing the foundation from the outside. This service is crucial for homeowners experiencing leaks or dampness in their basements, especially given that 54% of local housing units were built before 1980 and the dominant Wauseon soil series is poorly drained.
The exterior waterproofing procedure involves excavating to the footer, followed by cleaning and drying the wall. A liquid-applied waterproofing membrane or rubberized coating is then applied to the foundation. An exterior drainage board (dimple mat) is installed to direct water to a footing drain, and the area is backfilled with gravel. A full basement waterproofing project, which often includes exterior work, typically ranges from $2300 to $10000. The local soil conditions, with a dominant Wauseon series characterized by poorly drained drainage and a secondary Cadmus series with moderately well drained drainage, highlight the importance of robust exterior waterproofing to manage water accumulation around foundations. The provided grounding data does not include information regarding local permits for exterior basement waterproofing.
Frequently Asked Questions
What is the difference between waterproofing and damp proofing?
Damp proofing is a surface-applied coating that resists moisture vapor; true waterproofing manages hydrostatic pressure and bulk water intrusion through membranes, drainage systems, and sump discharge.
How long does a waterproofing system last?
Interior drain tile with a quality sump pump typically carries a long-term transferable warranty from reputable installers; exterior membrane systems can last the life of the structure if the drainage layer is maintained.
Does basement waterproofing require a permit?
Cutting into the slab for interior drain tile or installing a sump discharge line usually requires a plumbing or building permit; exterior excavation to the footer also requires a permit in most jurisdictions - we pull whatever the local code requires.
What actually causes a wet basement?
The most common causes are hydrostatic pressure from a high water table, poorly graded soil that drains toward the foundation, clogged or absent footing drains, and cracked poured or block walls that allow lateral water migration.
Is interior or exterior waterproofing better?
Exterior waterproofing stops water at the wall, which is the ideal solution for new construction or where excavation is practical; interior systems manage water that enters and redirect it to a sump, which is less disruptive and often the only practical choice for finished or urban lots.
How long does installation take?
Interior drain tile in a typical basement runs two to three days; exterior excavation and waterproofing takes three to five days depending on depth and wall length.
Ann Arbor Conditions That Affect Exterior Basement Waterproofing
- January avg low 19.2 °F. July avg high 83.7 °F. Seasonal range ~64 °F. NOAA Climate Normals 1991–2020.
- Annual heating degree days (base 65 °F): 6067. NOAA Climate Normals 1991–2020.
- Secondary soil series: Cadmus (L). Moderately well drained drainage. Source: USDA NRCS Web Soil Survey.
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