Exterior Foundation Waterproofing in Raleigh, NC
Stopping water before it ever reaches the footing. Priced for Wake County homes on Cecil Clay Loam over granite bedrock.
How much does exterior foundation waterproofing cost in Raleigh, NC?
Exterior Foundation Waterproofing in Raleigh, NC costs $4,500 to $10,500 for a typical home. Exterior foundation waterproofing in the Raleigh area costs $4,000 to $15,000. Crews excavate to the footing, apply a membrane coating, install French drains and footing drain tile, and regrade the lot so runoff moves away from the crawl space.
Raleigh soil and why crawl spaces fail here
Raleigh sits on the Cecil soil series, a red clay loam weathered from granite and gneiss of the Raleigh Belt. Beneath the topsoil, dense clay subsoil sits on saprolite and shallow bedrock, so the 46 inches of rain the city receives each year cannot percolate downward. Water moves laterally instead, riding the top of the clay until it reaches a foundation footing.
Inside-the-Beltline homes from the 1940s through 1960s were built with open vents and bare dirt floors. The stack effect pulls that soil dampness up through the floor system and into ductwork, seeding Cladosporium colonies on subfloor sheathing and carrying musty air into bedrooms upstairs.
From Five Points and Hayes Barton to Brier Creek and Wakefield, Raleigh's housing stock spans eighty years of construction standards, and almost none of the pre-2005 crawl spaces were sealed.
Scope included in Raleigh
- Excavation to footing depth with membrane or elastomeric coating
- Footing drain tile bedded in washed stone with filter fabric
- Downspout extensions and yard drains routed to daylight
- Positive grading of six inches over the first ten feet
Signs you need this
- Water entering through the block wall, not the floor
- Downspouts dumping beside the foundation
- Negative grade sloping toward the house
Neighborhoods we cover in Raleigh
Other services in Raleigh
Exterior Waterproofing in nearby Triangle towns
See the full Raleigh crawl space guide or the Triangle-wide exterior waterproofing overview.
Exterior Waterproofing in Raleigh: common questions
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