New garage...more basic questions

[Royalwapiti]

Concrete gets poured Tuesday morning, concrete contractor will finish forms tomorrow and it gets inspected then too. 12 inch thickened slab on edges, 5" in center.

Couple basic questions, I asked him and he says he'll do it anyway I specify, which doesn't help me. He basically doesn't want the liability if something is wrong.

Anchor Bolts: I laid them out so they are 6 feet or less apart and they should not interfere with my 16 inch center framing. I am buying 10", is it standard to leave them out 3" or 2.5", is there a standard?

He asked me about hurricane straps in the concrete, in South Dakota we get good winds but I think the anchor bolts will be plenty, do I need hurricane straps?

Thanks (More questions on framing forthcoming.)

 

[TRWham]

Local code may vary, but the IRC calls for spacing at not more than 6 feet on center. However, you also need at least 2 per sill section and one within 12" of each end, so plan accordingly. They should be embedded 7" minimum. Anchor bolts only anchor the sill, but strap tie holdowns connect to the studs so they do offer an additional level of security.

 

[Royalwapiti]

Thanks

 

[matt_i]

5/8" anchor bolts, 12" long, stick up 3" or so. I would get the galvanized versions. I would masking tape the threads so they don't get concrete splash in them which has to be cleaned or chipped off later.

I've seen sheathing stick out past the foundation, I've seen it flush with the foundation, I went flush. So sheathing thickness + 2-3/4" for a 2x6 wall, in from the edge of the concrete.

As above it gets tricky where there's a short-length wall with a man door or garage door in it, getting 2 bolts can be a trick plus have to account for the jack studs.

I would try to mark them with saw kerfs, notches, dimples, etc as everything gets grey & muddy as soon as the concrete starts to flow and its really easy to miss marks made with a pencil or marker. Its not the end of the world, studs can be epoxied in later but its a more expensive route.