I’m told different things. Is it neccessary to vent a cathedral ceiling when using open cell foams such as icynene or corbond urethane? I’ve avoided venting with closed cell foams and there never has been a problem but am contemplating switching to open cell. Any pro and con opinions?
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Ace, I've been gathering info on the same question you have and wonder if you've made any decisions. What I know so far (and sounds right to me) is that there is no venting required of vaulted ceilings but that the foam should be applied to the ceiling of a gable roof and the attic vented. I know that the Certainteed tech person said that non-venting would void their warranty but I've read other discussions that indicate that this may not be the end of time to do so. I have just received info from the corbond and icynene people that support the non-venting theory.