Rental grade cosmetic rehab- paint, carpet to go, hardwood underneath so polishing ,  install window/central AC and/or fencing depends on the rehab budget. roof, windows appears new. furnace, hot water heater in good condition, no fencing or central AC, basement and foundation in good condition (little moisture there though) waiting on contractor rehab estimate.Rent range - $695-750 . $750 if install central AC and fencing.

The hardiboard planks are too hard to keep up due to moisture and sealing issues.

It appears as if the crumbling and softness is from moisture, and it appears as if the previous owner realized this by installing new water troughs on the roof. 

I'm looking at an off market house in Marysville an I need input from someone who has paid a company such as Clean Crawls to clean, disinfect, replace moisture barrier and insulation.I'm trying to figure out a ball park cost, but none of the companies I called will give any kind of ball park pricing over the phone.  

Wondering if sealing gaps with great stuff and putting an underlayment which is also a moisture barrier would do?  

As far as the basement musty smell, I would recommend adding a moisture absorbing product down there to help eliminate the excess humidity.

@Tyler Meade You can stop mold by stopping the moisture source. 

I said I have an umbrella insurance already as well as a living trust and they said that those are still very penetrable but what they have is absolutely not penetrable mainly because it is a third party entity and not tied to your social security. 

I also had to rewire some kitchen and bathroom electrical to bring it up to code, relocate a sub-panel that in a spot that no longer allowed according to current code, modify the shower to be single handle, install vacancy and moisture sensing switches in the bathroom, install motion and photo controlled exterior lights, install hardwired smoke/co detectors, etc.

I said I have an umbrella insurance already as well as a living trust and they said that those are still very penetrable but what they have is absolutely not penetrable mainly because it is a third party entity and not tied to your social security.