I’m in the process of shearwalling my garage now, and I’m realizing I should add some more hold downs into the concrete before I cover it up.
The concrete sill around the perimiter of the attached garage is about 5″ high and 6″ thick. I’m looking at the Simpson epoxy based system. My question is this: How deep do i need to sink these? Do I need to go below the floor slab, or is it enough to go just as deep as the sill?
This is a single story, ridge beam garage. I’m putting in some attic storage too. I might possibly expand another floor overtop, if that makes any difference to this discussion – but that won’t happen for years, if at all.
Rebuilding my home in Cypress, CA
Also a CRX fanatic!
Replies
Depends on that actual load on each bolt, and the diameter of the bolt. The Simpson epoxy is good for "X" lbs of withdrawl per inch of embedment, depending on the size of the bolt. Without the load info, no one here can tell you how deep to embed the bolts.
Bob
OK, I'm planning on using 1/2 rod - yes, I know that's thin, but it's connecting up to other threaded rod I have existing.
However, I'm asking specificly can the anchor be in just the sill wall, or does that not count as an embedable surface?
If it is all the same then I can figure out the loads myself with their downloadable software.
Rebuilding my home in Cypress, CA
Also a CRX fanatic!
Edited 12/5/2005 7:10 pm ET by xxPaulCPxx
It looks like part of the answer lies in the "Critical Distance" to the nearest edge. In the case of the epoxy set threaded 1/2" rod the Critical Distance is 3 3/16". Oddly, if I'm reading the tables right the Critical Distance goes up the deaper I sink the rod into the concrete. I guess this might make sense since the CD is the least distance that the connection is at 100% strength... the deaper you sink it the stronger it gets... but it can get stronger than the walls around it.
I think it would make more of a difference if i was using a mechanical anchor like the wedge types. The CD of those start at over 6" for the same size.
Screw it. I'll sink them 8" at least.
Rebuilding my home in Cypress, CA
Also a CRX fanatic!
Edited 12/6/2005 3:12 am ET by xxPaulCPxx
Anchors work on a cone-shaped resistance plane. Going any deeper than the critical anchor edge distance or spacing is just a waste of material and labor that could potentially cause sill damage. The Hilti manuals are great resources for proper installation....that's not a mistake, it's rustic
Thanks for the tip on the Hilti docs, I just looked them up. While going deeper will not give me the full capacity of the CD, it will give more than the shallower installation (though just a percentage of what it would be if it were at CD).
As for potential damage to the concrete sill... If we have a seisemic event big enough to yank the concrete sill off the rest of the foundation, fixing that bit of concrete will be the least of my worries!Rebuilding my home in Cypress, CA
Also a CRX fanatic!