We were worried too when our sub floor got snow siting on it. Our builder told us the flooring type they use now will not warp etc because of it getting wet. That was last winter. We moved in last August. It did not seem to hurt the subfloor. No warping or mold that we could detect. It pasted required inspections, so no mold. We had hard wood put down also.

If there is standing water, push it to drain holes. The primary concern is softness of the glue and loss of strength rather than warping. If it is Advantech or a similar treated sheathing there should be no problem but standing water should still be removed.

If there is a lot of water drill some holes.

We're building in Georgia too. We had to shop vac after some storms this summer but it hasn't seemed to affect the subfloor long term.

Husband is picking up a shop vac in the morning. Going to be a wild Sunday at our house! Ha! :)

Here is some good reading. http://mattrisinger.com/pre-drywall-moisture-meter-check/ It is true the subfloor can get wet and not have issues, but if it is staying for over a week with water sitting on it I would get worried.

You don't need a moisture meter for a wet subfloor. The problem with OSB subfloor panels is that unless treated (Huber Advantech, etc) they swell when wet and they don't shrink when they dry. Long term wetness could even damage the glue. Drilling holes and pushing the water to them is simple and easy and should be done by the contractor not the owner. Louisiana Pacific even makes OSB subfloor panels with notches in the tongue for drainage.

Missi,

Our share of lots of rain had me worried about the same thing. Roof is on now but still not weather tight, theres still a door not in, and now its snowing.(wisconsin) Our subfloor looks to have held up well, and with the rain, we were sweeping and such when we could. It did keep me awake quite a few nights worrying. When it's all done, we'll all look back and say it wasn't so bad..right?

It rained on our disoriented :) strand board underlayment. Dried it out before finishing the floors. No problems.

Okay ... So I think the first floor is going to be alright since its Advantech. Now it's the basement. I'm noticing mold on the ceiling joists. Any advice? Bleach?

Have that checked out. Most likely it's just surface mildew stains (you can bleach them or not). If the water source is gone, then they're probably fine. On the off chance it is a more serious mold issue, you'd want to know so it can be properly remediated.

We spent 5 hours using the shop vac on the lake in our basement. Hoping it stays dry - although expecting more rain tomorrow. Roof finally on so we should be good. Now some sunny - non-humid weather would go far!

Was your basement slab poured before the roofing was installed? It is normal to wait so rainwater can be absorbed by the earth instead of creating the condition you have described. This should be the contractor's problem not yours.

Well, don't panic. What you need to do is get the roof on, get it closed up and start the drying process with electric blowers etc. Make sure everything is dry before insulation.

If you have mildew, our contractor used simple green to scrub it off.

If there is a sump pit, you can use a submersible pump and a hose to get the water out as it comes in.