I'm building a home which has a spec for a steel girder, rather than wood beam, under the first floor subfloor. THe girder is a 10WF21. I'm trying to understand: a) should the girder sit on the sill, in the same way as the wooden beam would, or should it rest directly on the concrete b) how do the floor joists join into the beam c) can someone tell me from the spec of the beam if the beam height will be the same as the 2x12's that I plan to use for the sill?

We are having an addition put on our home. Due to excessive amounts of snow and rain this year, a lot of water/moisture built up in the crawlspace of the addition prior to getting the roof on. We're now faced with mildew/mold growing on the wooden floor joists (GPI 40 joists). We've gotten rid of the water, but now we still have the mildew/mold. I know bleach or vinegar will kill the mold on the floors and walls, but am concerned that they may be too harsh for the I-joists. Is there something else that can be used on these, or would the bleach be OK? Any help would be great! Thank you.