slab isolation joint - 1/2" typ?
slab isolation joint - 1/2" typ?
(OP)
What is the width of a typical isolation joint for a concrete slab on grade? As in the type that would interface between a column footing and slab, a generator pad, or around the perimeter of a 'floating' slab?
I have used 1/2" in sidewalks I've poured but have limited experience pouring (or designing) slabs.
I have used 1/2" in sidewalks I've poured but have limited experience pouring (or designing) slabs.






RE: slab isolation joint - 1/2" typ?
Note that the "oversized" joints for equipment foundations are not needed for normal operation. The extra clearance is for the day when the equipment "fails" and vibration becomes excessive. Then the extra space is to help limit any structural damage to the foundation itself.
www.SlideRuleEra.net![[idea] idea](https://www.tipmaster.com/images/idea.gif)
www.VacuumTubeEra.net
RE: slab isolation joint - 1/2" typ?
The only time I have used larger joints was for airport apron slabs outside a hangar I designed. There, the joints followed standard FAA requirements, which used something like a 1.25" wide premolded rubber joint filler.
If you had large expanse of slab, you could calculate expansion/contraction with thermal changes, along with any shrinkage anticipated after the joint is finihsed. This would then tell you how much movement you need in your joints. Then, you could see if your joint filler (caulking) could take that range of movement. If you found that you need +/- 1/8", well, a 1/2" wide joint with caulking capable of moving +/-25% would work.
RE: slab isolation joint - 1/2" typ?
RE: slab isolation joint - 1/2" typ?
RE: slab isolation joint - 1/2" typ?
RE: slab isolation joint - 1/2" typ?
Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that them like it
RE: slab isolation joint - 1/2" typ?
Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that them like it