PerimeterTile — Interior drain, exterior dig or neither

Moisture on either side of a taped sheet

Where the Water Comes From

Condensation or Seepage — A Square of Foil Answers It

Two problems that look identical on a damp wall, with completely different remedies, separated by a test that costs nothing.

3 min read

Sections

Where the Water Comes FromReading the wall before spending anything.
Interior Drain SystemsLinear feet of drain tile, sump connection and what it does not fix.
Exterior ExcavationThe expensive answer, and the cases where it is the only one.
Crack Injection & SealingEpoxy against polyurethane, and what a sealed crack still lets through.
CostPer linear foot by method, and the honest comparison between them.

Latest

Interior Drain SystemsInterior Drain Tile — It Manages Water Rather Than Stopping It
The name says waterproofing and the mechanism is drainage. Understanding that difference explains both what it fixes and what it does not.
Interior Drain SystemsSizing a Sump Pump — Head Height Matters More Than Horsepower
The number on the box is measured at zero lift. Your basement is not at zero lift, and the gap between the two is where flooded basements come from.
Exterior ExcavationExterior Waterproofing — Stopping Water Instead of Managing It
Interior systems let water in and take it away. Exterior work stops it arriving, and the difference shows in whether the wall stays wet.
Where the Water Comes FromWhite Powder on the Wall — Efflorescence Is Evidence, Not Damage
Scrubbing it off removes the evidence and changes nothing. It comes back because the water is still arriving.
Where the Water Comes FromWindow Wells — A Hole Beside the Foundation That Collects Rain
A well is a deliberately excavated pit against the foundation. Whether that is a problem depends entirely on whether it drains.
CostWhat Basement Waterproofing Costs — Four Tiers, Two Orders of Magnitude
Quotes on the same wet basement can differ tenfold, because they are proposals for four completely different jobs.
Where the Water Comes FromWater at the Wall-Floor Joint — The Cove Is a Gap, Not a Crack
Homeowners try to caulk it. The water then finds the next weakest point, and now there are two.
Crack Injection & SealingInjecting a Crack — Right for One Leak, Wrong for a Wet Basement
The cheapest real repair in the subject, and it only works when the diagnosis is a single crack in a poured wall.
Exterior ExcavationFooting Drains and Dimple Board — The Parts That Get Left Out
Waterproofing the wall without draining the soil beside it leaves the membrane holding back a column of water for the life of the house.
Where the Water Comes FromBasement Humidity — Under 50%, and Not by Opening a Window
Opening the basement window on a warm humid day is the single most common way people make a damp basement worse.
Interior Drain SystemsFinishing After Drainage — The Wall Is Still Wet, So Build for That
The drainage installed last month does not make the wall dry. Every decision about how to finish over it follows from that.
CostCheapest Fixes First — A Weekend Before a Five-Figure Quote
The order of operations is the largest saving available in this subject, and it costs a weekend and one season of patience.

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