Greetings, I am designing my next house to be built in Campbell Ca. It
will have a 2,500 sq ft basement. Instead of placing footings for the
stem walls I am planning on pouring a monolithic slab with the top edge
of the slab keyed to accept the stem walls. I plan to use 24" thick
slab reinforced with rebar and post tension. The edges will likely be
36" thick. The basement will also be used for my shop which needs to
support the weight of a small 10,000 pound forklift for moving my
projects. The Slab will also be the finished floor so I want it to be
as perfectly flat as possible for my machinery etc. It just seems
easier and cleaner to me to have one massive slab instead of separate
slabs, footings etc.
Question is: with the weight of the 12" x 12' concrete stem walls
be a problem to place on the edge of the slab even though it is heavily
overbuilt or will the slab be strong enough to support the stem walls
without excessive cracking? I realize there are a lot of variables
here but I just want to get a "feel" for what you experts think or
if you have seen anything like this before. I will have an engineer
spec out the job, but just wanted to see if anyone has done something
The houses that were just built next to my property are all monolithic
slabs ranging in depth from 12" to 36", even the garage is part the
I don't have a lot of experience in building, maybe about 8 additions
built from the ground up, so any suggestions are appreciated.
Help me out here Bob M
but a 24" PT slab on grade seems kinda burly
In my experience most machine shops in SoCal are in tilt building that
have SOG of 6" or less.
Unless you have some special soil conditions this seems like a LOT of
concrete, even for me :)
I just spent nearly 18 years working in a structural lab that had 24"
slab (not PT) over basement shear walls at 10' on center, so now you
know why I think a 24" SOG is kinda burly.......the lab basement SOG
was only 12"
all this issues can be easily dealt with by your engineer
We have been seeing alot of "basments" in this area recently. The last
one we did was in down town Santa Clara by the college. It was a
historic house that had the basment re-done and expanded.
The footings for the job above were 4'x6', the walls were 12" x 10' I
believe. I do not believe you will be able to do as you palnned in this
area aside from that, the thickness of the slab is not always the
I can tell you that the building department wanted nothing to do with
the design. the customer had an eng. draw the plans. There were a
couple of changes that had to be made but not without a huge mess and
lots of paperwork. You my friend are in the middle of liability county
where everything is over eng. and nobody wants to take responsibility
for it without a hefty price tag.. when your ready to build e-mail me
directly and we will check it out.
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