Basement Waterproofing Salem NH

Waterproofing a Salem basement

Salem is a suburban town where nearly eight in ten families own their house, and that changes what people want out of us.

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Owners who plan to stay are not shopping for the cheapest thing that gets them through a sale. They want it fixed once, with paper behind it. That suits us, because the guarantee we write is a lifetime one and it transfers if you ever do sell.

The Spicket, and what runs under the town

The Spicket River runs through Salem and the USGS gauges it at North Salem (USGS station 01100505, Spicket River at North Salem, NH) before it heads down into Methuen. Beaver Brook drains the western side of town toward Pelham.

Neither is a large river. That matters, because it means Salem is not usually getting flooded from a channel coming up over its banks. What you get is a water table that rises across the whole town at once when a couple of feet of snow melts into ground that is still frozen underneath.

About 53 inches of snow falls in a Salem winter (NCEI 1991-2020 normals, via Current Results, nearest station Massabesic Lake). It arrives in your basement through the floor wall joint, the cold seam where the wall pour meets the slab, which frost heave has been prying at all winter.

Why the water picks your foundation

Because the dirt there is looser than the dirt anywhere else on your lot.

When the house was built, a crew dug a hole, set the foundation and pushed that same soil back in around it. Disturbed backfill never repacks to the density of the ground that was never touched. It drains slowly and holds water right against the wall. In a subdivision, where the whole site was cut and graded at once, that loose ring is around every house on the street.

What it costs to waterproof a basement in Salem

$3,000 to $30,000 for a full system, driven mostly by how many feet of perimeter drain the basement needs, then floor condition and whether you want a battery backup.

Free inspection, free estimate, written quote inside 24 hours. Financing runs through Hearth, subject to approval, and 603 makes nothing on it.

How the Forever Dry System keeps it dry

Full perimeter drain at the floor wall joint. One 1/2 hp sump pump per 120 feet of that drain. Vapor barrier on the walls. Dehumidifier so the air dries out and not just the slab.

100% dry for life or we come back free of charge. It transfers to the next owner under our conditions, and the sump system carries 3 years with batteries excluded.

Take the battery backup. The storm that saturates the ground is the one that drops the power, and a charged backup moves about a residential pool’s worth of water before it needs charging. Battery only. We do not sell water powered units.

We do not dig up the outside. Those jobs settle and fail within two or three years and you have paid for it with the landscaping. Interior drainage lasts because you can get at it.

If your basement is dry and there is one crack, that is a crack. We will fill it and go rather than sell you a system you do not need.

Salem: local context

Most of the housing here went up around 1977, and about two thirds of it is detached single family. So the typical Salem job is a poured concrete or block foundation under a house that has had one or two owners. Those walls take interior drainage cleanly and there is no fieldstone to manage.

What we do see a lot of is the finished basement. Salem has plenty of them, put in over the years by owners who wanted the extra room. If yours is finished and it smells, do not paint over it and do not run a dehumidifier at it and hope. We will open a small section, look at what is behind the drywall, and tell you straight whether it is a drainage job, a demolition job, or both. (Housing age and ownership figures are in the sources below.)

Everything on this page falls under basement waterproofing. Beyond that, basement finishing, crawl space encapsulation, foundation crack repair and radon mitigation are all work we do in Salem. Soft or bouncing floors overhead are a separate question, and sill beam replacement and lally columns cover the money side of it.

What we find under a 1970s Salem colonial

The typical job here is predictable enough that we can usually tell you what we will find before we go down the stairs.

Poured concrete walls, eight feet, with a slab poured separately afterwards. That seam between the two is the floor wall joint and it is where the water comes in, in a line, low down, usually along whichever wall faces the high side of the lot. Often there is a sump already, dropped in when the house was built, with nothing feeding it. It sits in a hole and waits for water to find it, which water does not do reliably.

The fix is generally the drain rather than the pump. Give that existing pump a proper perimeter drain to feed it and it will do its job. We would rather add drainage to a pump you already own than sell you a replacement for a unit that was never the problem.

Grading, gutters and the cheap things to try first

Before you spend thousands, do the free things and see what happens. It is in our interest to tell you this and it costs us nothing to be honest about it.

Check that your gutters actually run and that the downspouts carry water away from the house rather than dumping it beside the foundation. Look at whether the ground slopes away from the wall for the first six feet or has settled back toward it over the years, which is common on a fifty year old lot. Both of those can turn a mildly damp basement into a dry one, and neither requires us.

If you do all of that through a wet spring and you are still taking water, then the problem is groundwater rather than surface water, and that is when a system is the right answer.

Work we have done nearby

Steel posts rust from the bottom up, so the damage is usually at the floor. These are different houses, not one job photographed start to finish.

Frequently asked questions

What a recent customer said

603basement solutions gave me an estimate, scheduled installation of sump pump within 3 weeks as promised. Dave was honest with his suggestion, Angel led the install. Efficient, honest and responsive. Highly recommend!!

Pamela Dinapoli, 5 stars, Google review

Sources

Spicket River streamflow: USGS 01100505, Spicket River at North Salem, NH. Snowfall: NCEI 1991-2020 normals, via Current Results (nearest station Massabesic Lake, 52.8 in/yr). Housing age and tenure: US Census ACS 2023 5-year, tables B25035 (median year structure built, 1977), B25003 (77% owner occupied) and B25024 (66% single unit). The cost range, the warranty and what goes into the system all come from 603 directly.