Typically it has the consistency of cooked oatmeal, but hours later it resembles damp solid rock.ĬLICK HERE to get FREE & FAST BIDS from local foundation contractors near you! It often arrives at a job site in a truck pre-mixed and ready to pour. The soil is applying sideways pressure to the foundation wall just as a heavy load applies downward pressure to a floor joist. Think of a poured concrete wall as a BIG BEAM that needs support at each end (top and bottom) just like a floor joist needs support at each end. The floor joists and subfloor assembly once bolted to the top of the foundation act as a support column at the top of the poured wall. It acts as a support column at the base of the wall preventing it from sliding off the footing the basement slab, if there is one, has been installed.the concrete has achieved a minimum of 75% of its design strength.When Should A Foundation Be Backfilled?Ī poured concrete foundation should be backfilled AFTER: That said, you want to know about backfilling a foundation. Should I cave in and let them backfill against the walls or should I suffer the consequences of delaying the project? Shawn S., Pittsburgh, PAĭEAR SHAWN: In my opinion, concrete is a mystical building material. However, the contractor is applying pressure to backfill so the rough carpentry subs can get to work. I was told to let the concrete cure for 25-30 days before backfilling it. The weather has been cool with temperatures averaging about 51 F. CLICK HERE to Get Tim's FREE & FUNNY Newsletter!ĭEAR TIM: I am building a new home and the poured concrete foundation was installed 17 days ago.Vertical steel bars are best to prevent failure.©2023 Tim Carter Backfilling Foundation Wall TIPS If this wall was backfilled before the interior floor was poured, it would collapse in no time. It is made from poured concrete and rests on compacted gravel, not a poured concrete footer. Backfilling a Foundation Wall - Believe it or not, this is a precast foundation wall.
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