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Hey all. We’re rebuilding a room onto a house (making a gable roof instead of shed roof, and adding a covered porch). The room is over a basement. Of course, as soon as we took the old roof off, we started a week of fairly steady rain. Before we started this job, the homeowner had raised the level of the floor and added styrofoam sheets as a noise barrier between the new joists (which sit on the old floor), and covered the new floor with Advantech. After we get the new roof finished, we need to try to dry out the old floor system (the original subfloor, the styrofoam, the new joists on top of the old floor, and the bottom of the Advantech. The homeowner is very concerned about mold growing under the floor that they laid (and on the styrofoam)

I’m running a dehumidifier and fans now, and after we have the roof finished, I’m planning to drill some weep holes from the basement, into the old subfloor to drain out those bays, run the dehumidifier, run fans, and run a heater. Is this likely to work, or does anybody have better suggestions for drying out the area and preventing mold growing? The homeowner mentioned pouring alcohol on the floor to kill mold — is there any merit to that idea? How quickly does mold grow anyway? There is mold in the basement, but surely that did not appear in the couple of weeks that we’ve been working on the house (it was a very musty basement to begin with.)

Thanks for any advice!