A clearer path to a drier home

Exterior foundation waterproofing

Excavate, seal and drain the outside of foundation walls. Learn what to inspect and what to ask before hiring.

For basement waterproofing inquiries, have the property ZIP ready and respond to the recorded instructions. See what to expect when calling. Confirm availability, inspection fees and scheduling; a connection or appointment is not guaranteed.

Foundation drainage membrane and footing drain during installation — Water management, from the ground up AI-generated service illustration

How exterior waterproofing works

The contractor digs down along the foundation, cleans the wall, applies a waterproof membrane or coating, and usually installs drain pipe at the footing before backfilling. Water is stopped before it ever touches the inside of the wall.

Pros and trade-offs

It addresses the problem at the source and protects the wall itself, which is why it's often recommended for serious or long-standing leaks. It's also more disruptive: landscaping, walkways and decks along the wall may need to come out, and access can be limited on tight lots.

What to ask

Which walls need work, how they'll restore the yard, where the footing drain will discharge, and how the price compares with an interior drainage system for your basement.

Before you choose a contractor

Confirm that the proposed work addresses the observed source of moisture. Ask about inspection fees, permits, exclusions, cleanup, discharge routing and warranty terms. Verify applicable credentials and insurance independently.

Use the waterproofing estimate checklist to compare the same scope across quotes.