Mold in new pole barn

[LonArcvarden]

So we just had a 40x60 pole barn put up on October 17,2023. We told the contractor that we would like a ceiling but we wouldn’t be putting in a concrete floor or insulating for a year or so. He suggested we put the ceiling up while he is there with the lift. So we agreed to have him add that to the build. The day before he was to build he asked us if we wanted him to tyvek the barn. He said that he knew we wanted to insulate it at some point and he thought it would be better to have the tyvek on, We agreed. So we went to the barn to check on it and there’s a good amount of mold everywhere. Come to find out the contractor tyvek around the perlins which left the barn with no way to breathe. I have contacted the contractor and all he has said was he has never heard of anything like that happening and he’d call of couple places. And now he won’t get back to me. Is he responsible? And what could have caused this? Is it because of not having ventilation?

[MichaelSavan]

Is there any ventilation? Doors or windows ever opened? Soffit and/or ridge vents? I suspect the dirt floor is a substantial source of moisture, maybe leading to condensation on the building.

[princemeraj]

Moisture sneaks into a new building fast if the floor is still dirt and the ceiling traps warm air. I had a similar issue and ended up running a dehumidifier nonstop and boosting ventilation until I could insulate and pour the slab. If the mold patches get stubborn, check out this resource since they were solid at figuring out the moisture source before cleanup.