Slab on Ground for residence remodel
Slab on Ground for residence remodel
(OP)
I am designing a slab on ground for a single story dimensional lumber framed residential addition. A 10x40 slab will be attached to the existing slab system with rebar dowels. The below grade geometry of the existing slab is unknown as is the reinforcing. There is no soils report for the site. I was planning on basing the design using guidelines from 1997 UBC Chapter 18,Div III section 1815 assuming moderately expansive soils. Is there any other guidance that I can reference. My only other references pertain to much heavier buildings (ACI, mat foundation design etc).





RE: Slab on Ground for residence remodel
A Member of
www.civilvillage.com
RE: Slab on Ground for residence remodel
I will further recommend that the top 6-12 inches of native, organic and deleterious material be removed and replaced by clean non expansive fill compacted to 95% relative.
I am stuck on the design process because I don't know how to calc cracking moment of inertia Icr. Any hints??!
The weird thing is that many of the engineers around here don't require soils tests for remodels of this type. I am hoping the building dept will....if not, I have assumed a high EI soil of 91-130 per ubc. I don't expect chloride issues here. We are in limestone country for the most part and this site is on a small ridge.
Thanks for the response!
RE: Slab on Ground for residence remodel
A Member of
www.civilvillage.com
RE: Slab on Ground for residence remodel
RE: Slab on Ground for residence remodel
RE: Slab on Ground for residence remodel
RE: Slab on Ground for residence remodel
The more I look into this the less I like the idea of designing foundations without soils reports!!! One engineer wrote disclaimers into his report. The language was..."since no soils report was provided, the owner is responsible, the engineer is not"..etc...The engineer could still end up with defense costs though...maybe? Of course this is probably always a possibility in this line of work!