Silicone calking for concrete, wood and metal?

Repair help for the do-it-yourselfer.
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Posts: 176
Joined: Thu Jan 06, 2011 12:39 am

Thu Aug 22, 2019 11:24 pm

I need to keep water from entering between my skirting's sill plate (pressure treated 2x4) and the concrete pad it's bolted to. The pad extends a good foot past the siding/skirting, in which case water tends to collect.

What caulking would work best?

Butted back against the sill plate (and skirt framing studs) will be Z-flashing that I plan to use for setting the bottoms of the new skirting (metal roofing material). This will provide a nice straight edge as well as to hold the skirting up from resting directly on the concrete and keep it from resting in water.

The Z-flashing, galvanized, is 3/8" for both seat and foot, so figure a bead would have to be a good 3/8" (a fair amount of caulking; but, I care more about doing things right than in sparing expense).

Posts: 176
Joined: Thu Jan 06, 2011 12:39 am

Thu Aug 22, 2019 11:33 pm

Could a moderator [please] correct the misspelling in the Subject line? Should be "caulking" (not "calking").

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Location: Weedsport, NY

Fri Aug 23, 2019 6:33 pm

"If I can't fix it, I can screw it up so bad no one else can either."

Posts: 176
Joined: Thu Jan 06, 2011 12:39 am

Fri Aug 23, 2019 6:47 pm

Yeah, I'd spotted that article (which is why I was leaning toward silicone). Just kind of looking for feedback on folks' experiences.

It's not a real big deal, as everything is going to be much better than it was before, but if I'm applying my time I like to do the best that can be done (and be done with it!).

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Joined: Fri Aug 30, 2019 11:02 am

Sat Aug 31, 2019 2:59 am

I've used silicone caulk in many places, and if it's applied well (which isn't that hard to achieve by oneself), then it'll hold for a while; plus, in the case of a mobile home, the extra elasticity when compared to other caulking materials is welcome.

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