Building on Old Concrete Basement Foundation
Building on Old Concrete Basement Foundation
(OP)
I have a situation and would appreciate any recommendation or suggestion. My client has a large basement that was used as storage under a one story building which was recently destroyed in a fire. The basement has a 12’ high headroom and the walls are 12” thick. There are also interior steel columns that appear to be in good condition. The building was built in 1930.
The client wants to build a two-story office building on top of the existing foundation and I am considering the following:
1. Taking a few cores through the foundation walls and having them checked for strength. Also to see if any damage was done due to the fire.
2. Sending a piece of the steel to the lab to check for type and strength.
3. Drilling in the basement slab to check thickness. I still haven’t figured out how to check the footing depth and sizes under the interior columns.
4. Checking with a re-bar finder to see if there is any reinforcement although I doubt.
5. Having a couple of borings done to see what kind of soil the 12’ foundation wall has been holding up over its 100’+ length.
Any help is greatly appreciated.
The client wants to build a two-story office building on top of the existing foundation and I am considering the following:
1. Taking a few cores through the foundation walls and having them checked for strength. Also to see if any damage was done due to the fire.
2. Sending a piece of the steel to the lab to check for type and strength.
3. Drilling in the basement slab to check thickness. I still haven’t figured out how to check the footing depth and sizes under the interior columns.
4. Checking with a re-bar finder to see if there is any reinforcement although I doubt.
5. Having a couple of borings done to see what kind of soil the 12’ foundation wall has been holding up over its 100’+ length.
Any help is greatly appreciated.






RE: Building on Old Concrete Basement Foundation
a. It is from te 1930's and the consistancy of the steel can't be what it is today.
b. The steel survived a major fire, but exposure to the heat may have damaged the steel.
c. You will never have a better oppertunity than now to do it.
RE: Building on Old Concrete Basement Foundation
RE: Building on Old Concrete Basement Foundation
It is unlikely that the concrete was damaged. Is it chalky, soft?
Footings sizes can be determined by cutting through the existing slab and excavating.
It might be prudent for the building owner to retain an engineer to review the conditions of the superstructure and foundation walls...
Dik
RE: Building on Old Concrete Basement Foundation
A36 steel came into general use in the 1960's. A9 steel has a lot of sulphur, so you don't want to weld to it.
Google this: "a9" steel and select the AISC Steel Interchange option.