metal oven roof condensation problems
First time poster but boy have i pored over these forums during the last few months as I built an Alan Scott style WFO with a 3'x4' hearth for a small bakery my wife and I are building on Lopez Isl. Soon I'll put up a post with lots of pics and some things i learned along the way, but first a question!
I boxed the whole thing in with metal studs, sheathed with concrete board. Insulation is ~4" of perlite covered with ~18" of mineral wool insulation, essentially filling up the box. I roofed the whole thing with corrugated roofing screwed directly to the steel studs. There's one large vent just under the eaves, but no ridge vent.
The oven cured for ~5 weeks, with lots of small fires, and eventually a few big ones before the insulation went in.
Now the problem!
I've got lots of moisture in the oven box and from the looks of it it's condensation on the metal roofing. Enough to soak down through the insulation on the side of the oven, through the insulating slab and out into the chamber below the oven. At first I just thought it might be a leaky screw in the roofing but I think there's too much water for that.
Any other oven builder ever have experienced with condensation? It makes sense that condensation would happen as the warm oven air hit the cold metal roofing, but where's the moisture coming from? in through the vent? out of the concrete?
Any thoughts would be appreciated!
I have a few pictures up on the web for on our kickstarter project that we used to originally fund the oven.
check them out here: