Anchor Bolts in Concrete for Wood Frame Construction

[PT999]

Concrete foundation wall to timber sill plate anchorage using 1/2" diameter anchor rods.

I am looking at the IBC New York State Edition "Residential Code of New York State" (RCNY). For those who have a copy, on page 60, it states "... anchor bolts spaced a max of 6 ft on center" Probably says this in all editions of the IBC.
Clear enough.

The same Code (page 25) states "Construction in regions where the basic wind speed exceeds 110 mph (my situation) shall be designed in accordance with:

(1) Wood Frame Construction Manual 1995 edition....

Looking at WFCM, for prescriptive requirements (page 113).

For anchorage, for sill plate to foundation, for 2 story homes, it calls for 23 inches spacing using 1/2 inch anchor bolts (presumably the RCNY meant 1/2" also) for lateral and shear loads, and 72 inches (ok the same 6 ft) for uplift.

So does the WFCM govern for lateral loads? I have never seen a project with anchor rods spaced at 23 inches.

By the way, for wind speed clarification, the RCNY states that 110 mph basic wind speed equals 90 mph fastest mile wind speed, which is the way it is shown in the WFCM tables.

I am also specifying stainless steel anchor bolts because of the ACQ issue in treated lumber. Am I the only one? I get that feeling when residential construction contractors see it.

 

[apsix]

I can not comment on the spacing requirements.

The information sheet found here;

http://www.ufpi.com/literature/acqfastener-216.pdf

states Stainless is only required in severe external applications. It also has a list of approved fasteners. Galvanised finish is fine where moisture is not expected.