Best Type Of Caulking To Use Under Bottom Plate 2x4 Boards? - Carpentry - DIY Chatroom Home Improvement Forum
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Old 05-11-2015, 05:03 PM  
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best type of caulking to use under bottom plate 2x4 boards?


I want to seal the bottom plates I put down for a tool building I am working on. these bottom plates will be treated, and I was just wondering what the best type of caulk to use is.

Also, if I don't drill into the slab and do anchor bolts, can't the bottom plates be attached using something like cut nails or iron nails? This is an existing slab that has been cured for a while, possibly 10 years or so.
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Old 05-11-2015, 05:49 PM  
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Cut or steel nails will just rust off in no time from reacting with the copper in the pressure treated wood.
Checked to see if you need a permit, they may require you to have a footing, not just set it on top of a slab.
With all the storms you have in that area hows the building going to stay in place just attaching to a slab?
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Old 05-11-2015, 05:58 PM  
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This is an existing slab with footings and an existing building. I am adding some walls. one is going to run along the outer edge of the slab where a door once was, that is why I am asking about the caulk to seal it.

I've seen what I thought were cut nails used before, but I guess those bottom plates were just regular untreated.

Permit is done. Just needing answers to my original questions.
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Old 05-11-2015, 06:21 PM  
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I use a butyl caulk.
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Old 05-11-2015, 07:15 PM  
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A few thunderbolts would do the trick for attachment. I would rather use a sill sealer under that plate than caulking.
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Old 05-11-2015, 07:30 PM  
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I'd never heard of sill sealer. Can you provide a link to this by chance?
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Old 05-11-2015, 07:34 PM  
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Foam SealR Sill Plate Gasket 5-1/2 in. x 50 ft.
http://thd.co/1jcBYyr
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Old 05-11-2015, 09:01 PM  
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I'd be using Tap Cons or a Ram Set.
One issue you may run into is the siding and sheathing should be no closer then 6 to the slab if it's exposted to the weather or it's going to rot.
Pictures are sure to help with ansewers.
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Old 05-12-2015, 07:15 AM  
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+1 on the butyl
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Old 05-13-2015, 12:17 AM  
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http://www.greenbuildingadvisor.com/...-building-code

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