Why bother thinking about it? GE SCS 1200 series and no worries about anything. BTW, the SCS says clearly - Not for use on fireplaces, stove pipes, or below water. Like I mentioned before, water will slowly degrade silicone. If you looks at the corner bead on an old tank you can see the slow degrading. The actual seam is protected by the corner bead. Technically, the structural seam never gets wet.
On smaller high end tanks (like ADA) where there is no corner bead the tanks will often begin to fail after 3-5 years as the silicone weakens and starts to pull. They usually split from the top down and the slight bowing keeps working the seam apart.
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04-16-2012, 10:17 PM
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