Serving Derry
Groundwater & Basement Water Intrusion in Derry, NH
Basement seepage, failed sumps, and hydrostatic pressure against the foundation are extracted and dried, and the path from the ground is identified so the loss does not repeat. Groundwater and basement seepage are extracted and dried only after the path from the soil is identified — a wall, a slab, a drain, or a failed sump. Drying the interior without stopping that path returns the same water to the same floor.
Frequently asked questions
The ground is ledge. Should that not mean dry?
Rock supports a structure admirably and takes in virtually nothing. Rainfall either remains on the surface or discovers a seam and runs along it, so rather than dispersing through soil it surfaces in a concentrated stream somewhere below. A property on stone therefore encounters more water at the footing, not less. Firm and dry are separate matters entirely.
There are old ponds above the house. Should that worry anyone?
Old mill ponds and their structures are scattered across this part of the state, many with no traceable owner because the companies that built them are long gone. The state register of dams records what exists and who holds it. Where a structure above a property is deteriorating, that register is the right place to start.
The town grew very fast in one stretch of decades.
It did, from a small town to one of the largest in the state, and a great deal of the housing arrived in that window on ground that had been farm and woodland. The channels receiving what it sheds were sized for the earlier condition and extended piecemeal, which is why upstream capacity is usually the constraint.
The same questions, in context, on the Derry mold removal page.