Serving San Mateo
Groundwater & Basement Water Intrusion in San Mateo, CA
Basement seepage, failed sumps and water through the slab are extracted and dried, and the path from the ground is found so the floor stays dry next season. The path from the ground is named first: through the wall, up through the slab, back through a drain, or from a sump that stopped. The space is extracted and dried, with the porous materials the water touched removed, and the delivery is addressed, because a dried floor only stays dry if the water stops arriving.
No obligation: the assessment comes before any scope
Often needed alongside
- Structural Drying & Dehumidification
Sealed air movers and dehumidifiers bring framing, subfloor and drywall back to a measured dry standard, with daily readings logged from inside the material.
- Emergency Water Extraction
Standing water is pumped and extracted around the clock, before it climbs the walls and soaks the subfloor. Same-day response where coverage allows.
- Mold Inspection & Testing
An independent assessor confirms whether the assembly that got wet is actually dry, whether growth started while it was not, and how far it reaches.
Frequently asked questions
Why does an added upper floor matter in a loss?
Because the two halves of the house are not the same building. The upper floor is newer framing, newer board and newer plumbing sitting on walls that were built for a roof rather than for another story. Water crossing that junction moves from one kind of construction into another, and the two dry at different rates.
Where does water from upstairs actually go?
Into the floor structure at the junction first. A failure in an added bathroom lands on the deck of the new floor, which is the ceiling of the original house, and runs along it until it finds a way down at a wall line. The room it shows up in is frequently not the one under the bathroom.
Is the original roof still in there?
Sometimes, and it is worth knowing before anything is opened. Some of these additions were built over the existing roof structure rather than removing it, which leaves a closed void between the two floors with old decking in it. That void holds water and cannot be reached without opening a ceiling.
These questions come from the San Mateo page.