Replies

1. Expert Member
   ARMANDO COBO | Feb 09, 2023 09:36pm | #1

   See IRC R403.1.6. Most wood sill plates are usually anchored to the foundation with minimum ½” anchor bolts (5/8” are better) spaced NOT GREATER than 6 feet on center. Bolts should be inserted into concrete at least 7” and located in the middle 1/3 of the plate’s width. You must tighten all bolts with nuts and washers. Install bolts within 12" of connecting walls, corners and openings.
   Depending where you live, site and soil conditions, especially with Seismic zones C & D and even certain length of walls, you may need your foundation engineered.

1. 
   idahobuild | Feb 09, 2023 10:15pm | #2

   I am trying to find an engineer, that is licensed in Idaho, to review the plans. I am in Seismic C. I'll start with 6 foot center max (and other 'per code' references) and see what happens.

   Thanks.

2. 
   kbentley57 | Feb 10, 2023 08:47am | #3

   Many times they end up less than 6' spacing on average due to all of the other requirements on them, as Armando mentioned.

   Don't neglect the hold downs! Anchor bolts are there to provide the shear, but not (necessecarliy) for uplift or tilting. Those may also provide shear resistance, depending on the style. If you search youtube for the APA channel, they've actually got a really good series on portal frames, anchoring, and other topics.

3. 
   idahobuild | Feb 16, 2023 04:59pm | #4

   Thanks Kyle.