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If your foundation walls are bowing, buckling or are showing signs of inward movement, repair work is a necessity. These symptoms are a sign of weakening walls and potentially serious damage. Steel H-beams are installed from the inside of the basement. You secure steel beams in place to brace the bowing wall. It is important that this system is also tied into the frame work of the house to make sure it is set in place. This system braces the wall and prevents it from moving any more. It doesn’t straighten the wall back in place. Because these braces are straight steel beams they only will support where the wall is bowing at its worst.
H-beam is a structural beam made of rolled steel. ... The H-beam has wider flanges than an I-beam, but the I-beam has tapered edges. The width is the flange, and the height is the Web. The difference between both H-beams and I-beams is the flange by web ratio.
In some cases we use a 1/4" angle iron lagged into the floor joists. Other situations we will sister up the floor joists with several 2x8 and bolt the 2x8 blocking. Sistering joists means beefing them up with additional material. Doing so strengthens weak joists and will give extra strength to keep the "H" beam in place.
Steel Supports braces old block foundations. But in some cases you will have to rebuild the CMU wall with new CMU then have all the cells filled in with 1/2" rebar and grout. Once you get the wall built, roll on a waterproof membrane on the exterior side.