Concrete floor thickness with poke thru

[bcorbin]

Does anyone know where I can find information on minimum concrete floor slab thickness? Invariably, when I am asked to use poke-thrus or floorboxes, and I ask how thick the slab is, I get "tell me how thick it needs to be." I'm not a structural engineer, and I didn't sleep at a Holiday Inn Express last night, either. Any nudge in the right direction would be great.

 

[c2500]

Are you talking about a home built on a slab?

c2500

 

[iwire]

Does anyone know where I can find information on minimum concrete floor slab thickness? Invariably, when I am asked to use poke-thrus or floorboxes, and I ask how thick the slab is, I get "tell me how thick it needs to be."

I would expect that info to be in the manufacturers directions and specs. Just like many will require a minimum of 24" between poke-throughs.


Here is typical Hubbell info

Fire Rating

For use in 1, 1 1/2, 2, 3, or 4 hour rated unprotected reinforced concrete floors or in 1, 2, or 3 hour rated floors employing steel floor units and concrete topping (D900 Series design).


Floor Thickness Range

2 1/4" (over metal deck) to 7" (57.2mm to 177.8mm).
UL Installation Spacing Minimum of 2 feet O.C. and not more than one unit per each 65 sq. ft. of floor area in each span.

 

[bcorbin]

Hmmm....maybe I should have looked at the Hubbell first. The Wiremold cutsheets don't have the floor thickness info.