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Old 03-10-2008, 10:46 AM   #16
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Sealing pipe through block foundation


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Originally Posted by majakdragon View Post
...Most areas require black iron pipe for gaslines since the galvanized coating can flake ...
Hmm, I wasn't aware of that. Galvanized is permitted here in PA and I went with it because it was going to be partially exposed to the elements (a whole 4" of it ).
For my application the price difference was negligible, so I figured it was the better choice.

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Old 03-10-2008, 11:10 AM   #17
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Sealing pipe through block foundation


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I would use a silicone caulk. The concrete will move or the pipe will expand and contract from changing temperatures. This could rub a hole in the pipe. Not fun to get a gas leak inside a concrete block. Silicone will allow for movement.
...
That is why he needs to use a polyurethane caulk. NOT silicone.
Polyurethane caulk/sealant is the industry standard for such an application.
It is permenantly flexible.

Example: http://www.basf-cc.com.au/sealant/index.htm
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Old 03-10-2008, 01:04 PM   #18
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Sealing pipe through block foundation


Kboorman, Code variations are the reason I usually tell people to check their LOCAL code. Codes are not the same nationwide and even National codes can be added to by local authorities.
Atlantic, I do hardly any residential work and most commercial jobs require a sleeve through any masonary walls for gas piping (inside or out). Guess the contractors I have worked for had silicone "on hand" and gave it to us to use. Not saying it's right, just what we were supplied with.
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Old 03-10-2008, 01:29 PM   #19
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Sealing pipe through block foundation


FWIW: My point about the polyurethane sealant is actually based on industrial construction and multi-unit construction work that we do.
On the Industrial Work, EVERYTHING (all work) is "held under a microscope", by the engineers.
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Old 03-10-2008, 02:28 PM   #20
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Sealing pipe through block foundation


I agree. When i did a job at Post Cereal, they supplied a foodgrade and insect resistant product for between sleeves and piping. Disney (strangest inspectors I have ever seen) also required a rubber type product and the space needed to be completely filled inbetween the pipe and sleeve (not an inch or two at each end).
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Old 03-10-2008, 04:04 PM   #21
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Sealing pipe through block foundation


Urethane caulks will bond well to the masonry. Most silicones have serious adhesion problems when it comes to masonry. If you are caulking the pipe to the masonry use urethane, something like Sikaflex. If you are sealing sleeve to pipe, use silicone. Wipe the galvanize piping down with a solvent first as it usually has an oiley substance on it that will prevent either one from bonding well to it.
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Old 03-10-2008, 05:42 PM   #22
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Urethane caulks will bond well to the masonry. Most silicones have serious adhesion problems when it comes to masonry.....
Yes, Sika is another very good brand of urethane caulk and sealant.

To add to the point of adhesion:

Composite trim boards, like AZEK, Koma board, and others, require a urethane caulk (or a polyurethane caulk).
Silicone isn't even recommended, as it is not proven that it will stick, with the heavy expansion that composites experience during seasonal changes.
(We had to do a construction inspection & evaluation at one complex, only a year old, where the composite trim board siding was all separating, due to use of silicone caulking, and latex caulking)

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