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RolandOG 08-05-2008 05:14 PM

Short anchor bolts at a double sill - options?
My foundation contractor finished installing the new anchor bolts in my existing concrete wall. All of them are approx. 2 - 2 1/2" above the concrete and are too short for the double sill plate I'm about to install. I see two options: either counterbore a hole in the top plate or add a coupler and another 2" length of threaded rod. I've read posts suggesting both ways but is one better than the other?

Big Bob 08-05-2008 05:54 PM

wondering! what you are building that requires a double sill plate?

RolandOG 08-05-2008 06:45 PM

This is for a renovation of an existing house. I need the double sill plate in order to match the existing construction. If I didn't the new floor and the existing floor would be at different heights.

Termite 08-05-2008 09:40 PM

Unless your project's engineered plan says otherwise, you're only required to anchor the first bottom plate. So, just bore holes in the 2nd plate just wide enough to provide visual access to the nut and washer. I'm assuming you're anchoring the bottom plate, then tilting the wall with the 2nd plate on top of it. If not, just use a socket to get at the nut.

One thing to remember here. The bottom plate is the anchored plate, and therefore your sheathing must be fastened to it. I often see this done just like you're doing it, but people fail to tie the wall to that bottom plate by nailing the sheathing off. Inevitably, the sheathing is nailed to the upper bottom plate, which doesn't tie that wall down.

If for some reason you're required to have two plates (some wind load designs mandate it in some cases), I'd suggest getting some Simpson epoxy and drilling in threaded rod after the fact.

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