i've been dealing with my oven getting rained on while finishing up the exterior for a few weeks now. ideally, it should have protection against the rain, either in the form of a roofed structure or a fished coat over the igloo. in my climate, this simply wouldn't work, without water at least soaking the entranceway floor bricks, due to the fact that it rains 9 months out of the year.
i started firing it up the few times it was in drizzle without a covering, to try and evaporate the moisture as it landed on it. it worked to a degree, but the result of everything already being wet was a cool fire, and i think this would be the case until it is completely dry again.
i could be wrong, but i don't believe there is the same concern with cracking, as there is when it is first curing. the materials have all cured, they will have just drawn moisture again.
__________________ -paul overdo it or don't do it at all! |