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Old 10-22-2017, 01:35 PM   #1
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Sill plate anchors


I will be replacing approx a 7' length of rotten sill plate that is attached to the concrete slab at the front wall of the house with PT lumber, and using a foam barrier under the sill plate as well. For such a small expanse is it OK to use split drive concrete anchors to attach the new sill plate? I plan on spacing the anchors every 12" or so. A second option is to use Tapcon anchors.

Using split drive anchors seems to me the simplest and quickest way to attach the 2x4. The problem that caused the damp sill plate has been resolved. It was due to earth and dead leaves piling up over many years in the flower bed outside the exterior wall, thereby cutting off all the weep holes in the exterior brick veneer.
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Old 10-22-2017, 01:52 PM   #2
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Re: Sill plate anchors


Anchors every 12" is a little overkill. For a 7' length you really only need 2 drop anchors, (provided they are no more than 6' apart) and 1/2" diameter... but 3 wouldn't hurt... and maybe one near each cut end of the existing plates.

See R403.1.6.
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Old 10-22-2017, 02:40 PM   #3
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Would 1/4" split drive anchors be ok to use? I was going to use more due to the smaller diameter of the anchor.
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Old 10-22-2017, 04:57 PM   #4
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Re: Sill plate anchors


When the code (r403.1.6) says anchor bolts are 1/2 inch minimum, you can NOT substitute smaller ones, no matter how many you use.

A drive anchor cannot (in my area) be substituted for a wedge anchor or epoxy embedded Bolt.

You are not anchoring the bottom of the wall, you are tying the entire house down so it doesn't come off the foundation in extreme conditions, such as high winds or earthquakes.
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Old 10-22-2017, 08:49 PM   #5
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Re: Sill plate anchors


Thanks, I will go with the 1/2" wedge bolt anchors. What is the recommended spacing?
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Old 10-22-2017, 09:20 PM   #6
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Re: Sill plate anchors


Min 4 ft where I am.
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