The time it takes for wood rot to become established is measured in years rather than months, and it is unlikely that the structural properties of your timber have been affected by exposure to rain in the short term. However, the moisture content of the timber will have to be reduced to 15% or less before internal linings can be installed, and mould growth may appear on the surface in the interim. We would not recommend applying hydrated lime to the damp timber. Hydrated lime has a pH value of around 12, meaning it is highly alkaline.

Sound transmission through the floor is best controlled at the build stage when sound control materials can be incorporated into the floor cavity. If you already have floorboards on top of the glulam beams, and presumably a ceiling on the underside, your options are limited. We have several Technical Design Guides that touch on acoustic issues - see here https://www.woodsolutions.com.au/acoustic-considerations-construction.

We don't have an approved detail for the situation you describe. Details 54 or 55 in Guide #02 could be used but note that the FRL's stated in the Guide apply to the wall frame, not the floor. Also when it comes to situations not specifically covered in our Guides we can only give an opinion, not a ruling. Building approval authorities will have the final say.