Common questions about basement waterproofing
- What is the best method for waterproofing inside basement walls to keep a basement dry?
- What is the best way to reduce moisture in my basement?
- What is the best way to waterproof a basement in Toronto?
- What is the best way to waterproof exterior walls when remodeling?
- What is the cause of a wet basement? Is it always due to a crack?
- What is the cheapest way to waterproof a basement?
- What is the definition of a sump pump? Can a sump pump be used in a crawl space too?
- What is the effect of efflorescence on bricks?
- What is the process for installing French drains with a sump pump?
- What is waterproofing in the construction industry?
- What method of basement waterproofing is more effective long term, a French drain or a sump pump drainage system?
- What steps would you take to waterproof your basement,
Atkinson basement waterproofing — local context
If your Atkinson basement stays damp even through a dry summer, it usually isn’t the rain — it’s what’s under the slab. Atkinson sits in the southern-Rockingham lowland, where the USDA-NRCS New Hampshire Soil Catena Key maps poorly- and very-poorly-drained glaciomarine clays (Scantic, Biddeford, Maybid, Scitico). That marine clay drains slowly and holds water against your foundation. The signs of a high water table are all over town: New Hampshire’s prime-wetland method requires very-poorly-drained soils, and Atkinson’s own Prime Wetland Study documents prime wetlands across town, while the Big Island Pond it shares with Derry and Hampstead sits on NH DES’s 303(d) impaired-waters list. Translation: a high seasonal water table pushes water through the floor-wall joint under hydrostatic pressure. That’s exactly what our full-perimeter Forever Dry interior waterproofing system relieves — a perimeter drain, a sump per 120 ft, a WhiteCap wall barrier, and a dehumidifier, kept up with annual sump and drainage maintenance. Basement waterproofing runs $3,000–$30,000, priced to your foundation.
What a recent customer said
"My basement used to flood all the time. Standing water if we had a heavy rain. Since I purchased 603's forever dry system with the lifetime warranty I have had no issues. This week even with all the rain we had, it stayed dry. Awesome system!"
— George Fredette, 5 stars (Google)
Frequently asked questions
Why do Atkinson basements stay damp even during a dry summer?
Because the cause usually isn't surface rain — it's the soil. The USDA-NRCS New Hampshire Soil Catena Key maps Atkinson's southern-Rockingham lowland on poorly- and very-poorly-drained glaciomarine clays (the Scantic, Biddeford, Maybid and Scitico series). Marine clay drains slowly and holds moisture against foundation walls, so a high seasonal water table keeps the basement damp long after the rain stops. An interior full-perimeter drain to a sump relieves that pressure at the floor-wall joint rather than just chasing surface water.
Does Atkinson really have a high water table?
There’s documented evidence of it. New Hampshire’s prime-wetland method requires very-poorly-drained soils, and the Town of Atkinson’s Prime Wetland Study documents prime wetlands across town — a sign of a high seasonal water table. Atkinson also shares Big Island Pond (on NH DES’s 303(d) impaired-waters list) with Derry and Hampstead, a large surface-water feature that keeps groundwater near foundations on nearby lots.
Why does waterproofing matter more here than just adding a sump pump?
On slow-draining marine clay with a high seasonal water table, water enters under hydrostatic pressure at the floor-wall joint — not from one fixable leak. A standalone pump moves water that's already inside; it doesn't relieve the pressure. Our Forever Dry System pairs a full-perimeter interior drain, a sump pump per 120 ft, a WhiteCap wall barrier and a dehumidifier so water is captured and channeled out before it pools, which is what these Atkinson soil conditions call for.



