Waterproofing Match
How an interior drain works
An interior drain tile system is a perforated pipe laid in gravel along the inside edge of the basement floor, below the slab. Water that comes through the wall or up at the joint is collected before it spreads, runs to a sump pit, and gets pumped outside.
Contractors often add a dimpled plastic membrane on the walls so water running down them is directed into the drain rather than onto the floor.
When it's the right fix
It's a common choice for block-wall basements, water that comes in along the bottom of walls, and homes where digging outside isn't practical because of driveways, patios or neighbors close by.
What to ask
Whether the system covers the whole perimeter or only the wet walls, how they'll handle cleanouts, whether the price includes the sump pump, and what the warranty covers.
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.
