Houses get rained on all the time while being built but why is there no continuing mold problem after this?
In: Engineering
Mold and rot and the like take a while to become problematic.
The building envelope goes on the frame fairly soon after the frame goes up, which does not take long. It can only soak up so much water – most rain will just fall off the frame. After the envelope is on they leave the building alone for a bit so the wood can dry out – how long this takes depends on the local climate and how much the wood got rained on during construction.
Once it dries out enough they start putting the finishes on.
The only wood that is pressure treated are the piece that are in contact with the ground or the concrete slab they build the house on, or trim pieces that are exposed to the weather. The rest is just Dey lumber, often kiln dried, and can just handle a bit of rain for a few days before the building gets waterproofing on.
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