Hi all,Last winter I had tenants that complained about their bathroom being too cold...it apparently got so bad that the toilet would freeze up and the only short term fix was using a space heater which they did not want to keep paying for on their electric bill...the bathroom has a large crawl space (20' x 10') directly underneath it...The following summer I decided to have the crawl space insulated with spray foam to help trap the heat that is coming from the Gas Boilers which I figured would be enough to keep the bathroom warm (also paired with their forced hot water heating that runs through the bathroom)...Fast forward to today and they are still having issues and complain about it...has anyone faced a similar issue with a crawl space that causes something like this?

Spray foam is an option but more costly.I assume you are pulling permits - I would just call the building official and either A) tell him your plans or B) ask what he recommends. 

I still have chemicals that can be sprayed on the shingles then pressure wash the roof and looks like new. there are many individuals in Florida that still do it.  

I can help you with the rattling noise.I would get some spray foam and fill the space with a can.

Not sure if this is the same, or similar,  but Conklin Roofing devolped a product that sprays on.

If they're just rusty, sand and spray paint them.

He says there are bugs in the apartment so we have the exterminator spray his place and FUMIGATE the empty unit.  

Spray the stone down with a mild cleaner like Simple Green and let it sit for a few minutes.  

Having the mold remediated should be possible, cleaning and spraying in the crawlspace.My question;   Anyone have experience with disclosures to tenants of building history for rentals?  

I've sold homes with basement walls caving in, water spraying, and spiders larger than the cave scene in Lord of the Rings.