• Welcome to the new and improved Building Code Forum. We appreciate you being here and hope that you are getting the information that you need concerning all codes of the building trades. This is a free forum to the public due to the generosity of the Sawhorses, Corporate Supporters and Supporters who have upgraded their accounts. If you would like to have improved access to the forum please upgrade to Sawhorse by first logging in then clicking here: Upgrades

Point load on basement slab

A " skeptic" remains among us? Much of what Mark has stated in the past remains true, however in many states picking and choosing your issues remains allowed.
 
The 12" is the punch shear dim. Assume a 45 deg shear plane through the slab (footing) from the edge of the column. So a 4" square column would have a 12" square effective bearing area. That assumes no reinforcment. It gets much more engineery once you start adding reinforcement and your footing becomes a bending plate with spring supports.

I would be ok with a 1500# point load on a 4" slab by inspection.
I just want to weigh in with a thumbs up for use of the term "engineery". gonna have to borrow that one :)
 
Top