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Caulking Copper

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Old 09-13-2018, 03:42 PM   #1
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Caulking Copper

I caulked a hose bib penetration with clear big stretch last year. Took it apart today and the clear big stretch is a beautiful aquamarine.

Something tells me that caulking isn't good for the copper.

What do you recommend for caulking copper penetrations through the wall?

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Old 09-13-2018, 04:53 PM   #2
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Re: Caulking Copper

i've seen 100% silicone spec'd out as caulk for copper.

i wouldn't be too alarmed at seeing that color as copper will do that on it's own if left exposed. usually why copper is called out to get that patina. fancy name for it is verdigris.


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Old 09-13-2018, 06:30 PM   #3
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Re: Caulking Copper

Cleaned the caulking off the copper and it looks just fine, so your likely spot on. Just in this case it's the caulking that gets the verdigris.

I remember warnings from AAMA classes and JLC articles about certain caulks/sealants not reacting well with some metals.

Since I never work with coil stock or copper, I can't keep the rules straight in my head.
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Old 09-13-2018, 08:19 PM   #4
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Re: Caulking Copper

I always use Quad in no time the patina brings them together...Typical for me is up against brick/copper and high up but the match is good once the copper browns out, no discoloration and it's a tenacious, long lasting seal.
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