00:00What kind of job requires cutting through an entire house?
00:02Look closely.
00:03This worker is pushing a pneumatic plate driver,
00:06forcing stainless steel sheets into the joint at the bottom of a brick wall.
00:10This is not demolition.
00:11It is moisture surgery for an old house.
00:13In many older American homes, the worst part of a rainy day is not the roof.
00:17It is the basement walls, the moldy corners, and that damp smell that never goes away.
00:23The real problem is hidden inside these old red bricks.
00:26Brick looks solid, but inside it has countless tiny pores.
00:29Groundwater can climb through those pores, almost like water moving up a straw.
00:34In physics, this is called capillary action.
00:36Over time, moisture and salts push outward through the wall.
00:40That is why paint bubbles, plaster flakes off, and mold keeps coming back.
00:44So when workers drive these steel plates into the wall,
00:47one sheet overlapping the next, they are not weakening the house.
00:50They are adding a metal damp-proof barrier right at the base of the wall.
00:54Once that barrier is in place, it cuts off the old house's water straw
00:57and stops ground moisture from rising.
00:59So if this were your basement, would you let workers cut the wall to stop the mold for good?
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