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Old 08-10-2013, 10:28 PM
 
163 posts, read 406,228 times
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I truly hope you are successful. I would love to see more basements in Austin, but it's not going to be easy!
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Old 08-11-2013, 12:19 AM
 
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ok I looked at pictures from when we built and we definitely have a post tension slab. The garage is a couple feet lower than the house and it looks like the tension wires are not connected.
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Old 08-11-2013, 01:17 AM
 
Location: Slaughter Creek, Travis County
1,194 posts, read 3,961,412 times
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Quote:
Originally Posted by Austin97 View Post
ok I looked at pictures from when we built and we definitely have a post tension slab. The garage is a couple feet lower than the house and it looks like the tension wires are not connected.
Seek professional engineering assistance. You are attempting an engineering and unless you are licensed as a Professional Engineer in Texas, you will never obtain City of Austin approval.
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Old 08-15-2013, 09:02 PM
 
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so i have the original pictures from when the house was built. The slab and garage are both post tensioned. They have big sacks of sand or something that i guess is used as filler to use less concrete. the garage is about 2 feet below the house slab. Would they still be post tensioned together?
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Old 08-15-2013, 09:06 PM
 
Location: central Austin
7,228 posts, read 16,021,625 times
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You need an engineer to evaluate or at the very least to find the original construction documents for the foundation. They would detail exactly how the foundation was constructed.
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Old 08-16-2013, 12:19 AM
 
2,633 posts, read 6,377,716 times
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Originally Posted by Austin97 View Post
so i have the original pictures from when the house was built. The slab and garage are both post tensioned. They have big sacks of sand or something that i guess is used as filler to use less concrete. the garage is about 2 feet below the house slab. Would they still be post tensioned together?
Most likely, yes. The builders wouldn't want the garage sliding away from, or moving independently of, the main house.

Short of digging a tunnel and finding a limestone bat cave, you're probably going to be forced to go up.
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Old 08-29-2014, 02:13 PM
 
547 posts, read 1,429,625 times
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Austin97,

Just curious whatever happened to this little project of yours. I'm considering doing a large addition onto my home and am trying to figure out if a basement is feasible.
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Old 08-29-2014, 09:10 PM
 
7,742 posts, read 15,040,093 times
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Im not doing it now as my neighbors house may be up forsale in the next two years.

However, my ultimate solution was to completely tear out the garage and dig the hole, then rebuild the garage over the basement.
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