I inspected a newly renovated home for a client who was complaining about many,many issues. When I got to the detached garage, I found the garage had been built on the ‘foundation’ system seen in the attached photos.
My understanding from the owner is the GC set 6x6’s vertically in holes and filled the holes with cement in ‘pole barn’ fashion. The vertical 6x6’s extend up to the top plate of the 1st floor walls. Horizontal 6x6’s were then installed between the vertical units as seen in the photos. Gravel was then installed between these foundation ‘walls’ followed by pouring 6 inches of concrete on top of the gravel with the concrete extending over the top horizontal 6x6. At the time of the inspection there was no way to tell if the concrete had been poured as a monolithic slab with thicker perimeter concrete, or whether the concrete is simply a 6" slab.
I’ve seen many monolithic slabs, floating slabs, and footer/foundations, but never this system. I’m wondering if anyone has…Personally, I think this is FUBAR (as was the house).
Thanks in advance for any comments