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Clutchcargo 09-05-2008 02:04 PM

Half Lap Sill Plate Join
63 Attachment(s)
Background... I have a sunroom that I wanted to add a level on to make it two stories. I tore the old sunroom down to get to the top of a fieldstone and cinderblock foundation so that I could fill the open cell cinderblocks with concrete. That's done with the exception of where the J-bolts will sit. I'm starting to rebuild this weekend (weather permitting). The sill plate that I took out was 4x8 and want to replace it with 4x8 PT.

For the outside corners, should I half-lap the adjacent sill plates and use 1 foundation anchor running through the lap join? Will this satisfy the 3.5"-12" distance from the ends of the sill for the foundation anchor on both sill plates? The sill plate that I took out was half lap join but there were no foundation anchors.

Termite 09-05-2008 02:36 PM

No you shouldn't. You need a bolt on each plate within 12" of all corners and splices, but you probably can't get away with trying to kill two birds with one stone. I'd suggest two anchor bolts, each about 8" or 10" in from the outside of the corner of the intersection.

There's nothing wrong with half-lapping the mudsill, but the intent of the code is two bolts...One on each leg of a corner.

Clutchcargo 09-05-2008 03:00 PM

63 Attachment(s)
Thanks, if that's the case, I'll skip the extra work of the half lap.

Termite 09-05-2008 03:07 PM

I would. It just won't offer any benefit other than being nifty looking before you cover it up. :laughing:

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