Sometimes things just don't go right. But sometimes they do....
Concrete Morons part 2.
So, I noticed the back wall was bowed. This became more evident once the floor was in, but I did notice it right after it was poured and the forms were off. With the floor in it was really evident. I finally got a level on it, and it turns out that the bottom was bowed in 5". Now the top was straight and square, but suddenly I was concerned about the load bearing capacity of the wall. This part of the house has a tub right above it which is the single largest point load in the house. Up to 1000 pounds.
You can see the beautiful handiwork.
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The architects punted and said cut the wall out and put a new one in. Just what i wanted to do. Dig it back up, remove the waterproofing, drain piping, support the deck, cut out 35,000 pounds of concrete, dispose of that, and repour and redo the rest. I'm an engineer, albeit a mechanical, and I discussed it with a retired civil engineer friend of mine. Since it's a gable roof over this wall, all of the loads are pushed off to the side walls. We have a snow load of 50 pounds per square foot here, so the roof load is a concern. We both thought it might be fine and worst case, there could be a wall poured outside and rebared to the existing to shore it up. But even then, we both thought i should find an expert.
I hunted down a structural engineer with 40 years' experience and explained the situation and the possible loads. After a couple days he came back and said all is well, due to exactly what we suspected. The gable roof deflects the roof loads. Seeing that the wall hasn't cracked from the pressure from the soil backfill he said if it was going to fail, it would have already happened. Also, the location of the tub was over a spot that didn't bow very much.
Huge relief after weeks of stress.
Here's a drawing of the actual situation. Red is the footer, green is the top of the wall and blue is the bowed bottom of the wall.
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