The angled side surfaces of the blocks also allows.
Notch concrete wall.
4 recommends a contraction joint spacing of 30 times the wall thickness or 20 feet for an 8 inch thick wall 30 8 240 inches 20 feet.
First chip the bumps cracks and dents on the concrete wall with a hammer.
4 tall by 4 6 wide.
I ve already got a handle on what the header needs to be and know that i need to support the joists above.
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This 4 inch thick wall should be from the outside of the foundation wall what this does is leave a 4 inch shelf or lip or notch on the inside of the foundation.
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Then flush and fill the areas with cement.
Once the cement is dry apply the bonding agent that should give the surface a rough texture.
Some designers recommend re ducing joint spacings by about 20 in walls with frequent openings such as doors and windows.
Tial basement walls and the national ready mixed concrete association ref.
The wall is 8 poured concrete and the window is kinda big.
This 4 inch s will allow you to place the floor joist on top of it.
Use a standard circular saw equipped with a corundum or diamond blade for small tasks.
The jagged edge left below the cutting line provides a good rough edge for the new concrete to bond to.
I ll be removing the wall all the way up to the sill plate.
For slabs it s best to cut through the top inch then use a sledgehammer to break off the rest.
Because basement floors are poured after the walls are poured the concrete where they meet doesn t always bond completely and this is a common spot for a crack to appear when the house.
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