The moisture could have been coming from a few different things so I opened up the ceiling and it was condensation on the hvac pipe.

Not sure if that's true or not.From the water intrusion and the damage from moisture to the walls that was fixed, I don't see this as catering to a random whim or wish.   

That can cause moisture to build in the attic in your area.  

Moisture is liable to get behind it.

Can you detect areas that have sustained damage from moisture over time?

Omnichoice by Healthier Choice would be my only choice because it has a 70+ sound rating and is a closed cell urethane which is moisture resistant. 

If so, they will wick up any moisture they come in contact with. 

Mold needs moisture, the right temperature and food to grow.

They can also go in closets and they're not vented, they condense the moisture and drain it out. 

The FHA says that examples of such problems include but are not limited to the following: Missing handrailsCracked or damaged exit doors that are otherwise operableCracked window glassDefective paint surfaces in homes constructed post-1978 (because of lead paint hazards)Minor plumbing leaks (such as dripping faucets)Defective floor finishes or coverings (worn through the finish, badly soiled carpeting)Evidence of previous (non-active) wood-destroying insect/organism damage where there is no evidence of unrepaired structural damageRotten or worn-out counter topsDamaged plaster, sheetrock or other wall and ceiling materials in homes constructed post-1978Poor workmanshipTrip hazards (cracked or partially heaving sidewalks, poorly installed carpeting)Crawl spaces with debris and trashLack of an all-weather driveway surface=================There are many areas, however, where the FHA does require problems to be remedied in order for the sale to close.Electrical and Heating The electrical box should not have any frayed or exposed wires.All habitable rooms must have a functioning heat source (except in a few select cities with mild winters).Roofs and Attics The roofing must keep moisture out.The roofing must be expected to last for at least two more years.The appraiser must inspect the attic for evidence of possible roof problems.The roof cannot have more than three layers of roofing.If the inspection reveals the need for roof repairs and the roof already has three or more layers of roofing, the FHA requires a new roof.Water HeatersThe water heater must meet local building codes and must convey with the property.Hazards and NuisancesA number of conditions fall under this category.