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how to Anchor a really short sill plate section to slab?

8.3K views 13 replies 8 participants last post by  HenryMac  
#1 ·
Hi All,

I am adding an addition to my home.One of the new walls extends from an existing wall and will have an exterior door within 8-12 inches of the old wall.

Code requires that the anchor bolts that hold the sill plate down to the slab be: 1) one within 12 inches of each end; 2) more than 3-1/2 inches from the ends, and; 3) at least two bolts per section.

If my wall and sill plate section is only 8-12 inches before the door rough opening, the requirements above are impossible. I can put one bolt in the middle of an 8 inch span at 4 inches, or I can put two bolts basically right next to each other at 3-1/2 inches from each side which would leave only about zero to 3 inches between them.

Is there some exception to code that allows just one anchor in such a small section (shown at bottom right of picture)?

Thanks.
 

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#3 · (Edited)
I would add Construction adhesive to neil's remedy, just to do it.


ED


You'd think by now that I would remember how to spell Nealtw.

Make that PL construction Adhesive.
 
#5 ·
I think you can fudge where code conflicts with existing situation. Also smaller means not as essential to the structural integrity. Connecting the new wall to the old is also done with the wall studs as well. Don't just depend on the connection to the foundation, as with the sill plate. You don't want the sill to somehow move, so just use 2 maybe 4-5" apart? Don't crank down on the small piece of lumber since it could split.
 
#7 · (Edited)

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#8 ·
Impossibiities or conflicts do sometimes arise with codes......

We had a very similar issue in Cali..... our thought was that code wanted 3.5 (4" in our case as code is 7 x anchor diameter with 5/8 J's) to prevent end splitting, but also wanted sill secure.

We were new to the inspector, so we actually ran down to the office.... asked if we could just go 2" from the ends.... said sure.

There is nothing magical about 7xbolt diameter from the end.... and I think if you have logic applied in those instances , as in the above posts suggestions, an inspector would have no problem with the solution.

With all the earthquake considerations and fastening issues in Cali, we ran into other minor framing conflicts also..... often adding some simpson A-35s or other to compensate.
 
#12 ·
HenryMac, in your sketch, wouldn't I have a stud (or maybe even a double stud) where you show the angle bracket? FYI, this is butting the end of a new exterior 2x6 stud wall to what is currently the corner of an existing exterior wall, extending the wall. i.e., butting end-to-end, not making a "T" or "L".

I am wondering if I need a double stud at the end of the new where new meets meets old.