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I’ve had to replace some beveled cypress siding on a antique house. In fact this is round two (first the east side, now the back). Everything I’ve read says to backprime the siding, so I did that in round one. But, this time, when I bought some more the lumber yard person said do NOT backprime cypress for it will contribute to rotting. This person had experienced this himself. Backprime or not, that is the question . . . . .
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I would back prime. If I can get into his mind for a second here, I think his thoughts would say, that you would lock moisture within the shake itself, not allowing it to dry out naturally. But seeing how shakes are installed and sealed as to not allow water penetration in the first place, why do we then assume water will. Shakes are installed with the grain running up and down allowing for great water drainage from the shake itself. Not to mention the fact that the water runs off them in a hurry on a wall. I could be wrong but the idea behind back priming is not to allow water to wick from the back side and through the front , thus lifting or pushing the paint off the shingle. I am just using common sense here so I could be wrong. My forte is roofing and siding not painting. Good Luck. on Rose
*Fred, My opinion, but if you're going to put a film coating on the show side of a piece of siding, you should do the same to the other five sides as well.Prime it.
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I've had to replace some beveled cypress siding on a antique house. In fact this is round two (first the east side, now the back). Everything I've read says to backprime the siding, so I did that in round one. But, this time, when I bought some more the lumber yard person said do NOT backprime cypress for it will contribute to rotting. This person had experienced this himself. Backprime or not, that is the question . . . . .