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How to build an additional concrete/cinder block wall in basement, where the crawl space and basement meet

Home Improvement Asked on January 1, 2021

The small basement in my house (built in 1932) has three concrete walls. The forth wall is comprised of vertical wood boards. Behind the boards is the crawl space for the rest of the house. The basement leaks when it rains, and we plan on adding a DIY drain system inside, all the way around the basement wall perimeter.

However, there needs to be a fourth wall constructed, since the wood slates are old, and there is just dirt behind them. A basement waterproofing company said that a “brick” wall would need to be constructed where the wood slates are so that there are four walls to our basement for a system.

Their price was quite expensive, so I’m looking to do it myself, but I know very little about building a wall in my basement. I have some limited experience building with concrete and bricks.

How should I go about building the wall? Bricks, cinder blocks? How far down should I dig to pour a footer for the wall to sit on? Any advice or resources are helpful!

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One Answer

First I'd provide a 22" wide by 12" thick footing.

  1. Throw (3) continuous #4 bars in there elevated 3" clear from the bottom surface of the footing. They should be spaced 4 1/2" apart from one another and the group of 3 should be centered in the footing.

  2. Install #4 L shaped dowels (approximately 6"x3'-0") sticking out of the top of the concrete footing at 48" on center . Tie the shorter length of these to the continuous bars mentioned in step 1 to keep them in place when pouring the concrete. Alternate the direction (left and right) of the shorter length of the L.

Then I'd construct a 8" CMU wall.

  1. Place an additional #4 straight bar in the cells the contain the dowels. Footing should already be poured.

  2. Vertical grouting at 48" on center. (grout the cells of the CMU that have the rebar)

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Answered by represton on January 1, 2021

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