I am not saying mine is anything magical and i am sure it can be improved upon.Hall BathRemove existing flooring and replace with tile & grout to be chosen by companyRemoved existing wall tiles around tub, repair/replace any moisture resistant wall board, retile walls with design and tile chosen by company.

mold = moisture, so there could be extensive structural water damage that needs to be repaired.

Do it in where you think the moisture is coming from where the mold is worst.

Stuff can get in there, like moisture, and who knows what will grow. 

I did the simple stuff myself - paint, tile, wood laminate, gently used appliances, fixtures, ceiling fans and I contracted a few items like repair of a split floor joist, electrical short and a few plumbing problems. 

If your studs are contracting and expanding, you have a moisture issue and insulation problem.

Termites feed on wood, and they usually get into the buildings with areas excessive moisture (leaks, frame in contact with soil, etc).

@Sriram Kumar Bikkina My guess is that your friend may be trying to bring awareness to the fact that crawlspaces can typically create alot of problems particularly moisture intrusion, dampness, mold, etc. and can lead to moisture damage to framing components.

I’ve also had issues regarding aluminum wiring, electric panel not being up to code, rotted wood from a ton of moisture, and foundation issues.

The building inspection uncovered that the new house foundation is just sitting on top of the old one without any stabilizing measures.The crawlspace was largely inaccessible to the inspectors, but what they saw was mold/moisture issues.