Moisture Problems in New Construction Homes

Common issues in newer homes

• PEX fittings and manifolds — a single failed fitting can leak inside a wall
• Shower pans — see our Springville shower pan liner case study
• Window and door flashing — wind-driven rain gets behind siding
• Grading and window wells — new yards settle toward the house; see window well flooding
• Construction moisture — lumber, concrete, and drywall release moisture during the first year
• Bath fans not ducted all the way outside

First-year checklist

1. Look under every sink and around the water heater monthly.
2. Check the ceiling below upstairs bathrooms and laundry.
3. Watch for window condensation and stains on sills — window condensation guide.
4. Make sure downspouts and grading move water away from the foundation.
5. Confirm bath fans vent outside.

If you find a leak

Stop the water, photograph everything, and notify your builder in writing if you’re under warranty. Water damage still needs to be dried quickly regardless of who pays. See documenting water damage.