Replacing a sill plate on a rock foundation

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Replacing a sill plate on a rock foundation

Post by hankyknot » Tue Sep 24, 2019 4:05 pm

We have our main beam replace and are ready to install new sill plate where the old ones rotted away before installing our new wall. Whats the best way to attach these sill plates to the rock/masonry foundation?

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A. Spruce
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Re: Replacing a sill plate on a rock foundation

Post by A. Spruce » Tue Sep 24, 2019 6:08 pm

Depends on what kind of access you have and how long the piece of plate is. If the section is under 4' in length, simply tie it into the surrounding framing. You should have the sill, then a band joist, then the which caps the floor framing. Toe-nail the sill into the band joist and floor joists or beam. You can also install blocking across the joint from old to new to tie the ends together.

If the section is over 4', then it would be best to drill and anchor the sill, probably the easiest thing to use will be Tapcon screws, though technically, something more along the lines of an expansion anchor or "Redhead" would be more appropriate, you just have to be extremely careful you don't tighten an expansion anchor too much and blow out the rock foundation.
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Smart Guy
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Re: Replacing a sill plate on a rock foundation

Post by Smart Guy » Wed Oct 16, 2019 9:41 am

That is very tricky , expansion anchor should be installed very carefully. And it is going to be replacement as well. So the foundation will be more sensitive.

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