That is sealing off all vents with gasketed vent covers,  encapsulating dirt crawl space with 20 mil vapor barrier, sump pump, dehumidifier, airtight crawl space door, etc. 

.- Asphalt Roofing Manufacturer's Association "strongly advises caution when considering the application of any type of field applied coating over installed asphalt shingles," due to possible shingle curling/warping and possible vapor barrier may cause premature failure of roof decking.- Some shingle manufacturer's specifically state that coating will void the warranty.  

The banking industry and wall street created "VAPOR PAPER" that had no intrinsic value.

Other Vapor Paper can be seen, including "M3" expressed as Total Assets of all FDIC Banks ($13T +/- in 2008).

I think much of it has gone where vapor goes when it disappears.

Do you all allow for vapor cigs to be smoked in your or on your properties?

Things that were done:-Flooring-New walls -Roof-New kitchen-New master bathroom -Vapor Barrier-Tree Trimming -Paint What made you interested in investing in this type of deal?

I was wearing a half-respirator (3M-7000 series) with NIOSH-approved organic vapor cartridges, as detailed in the MSDS of the product, but I could not achieve cross-ventilation, even with the door to the closet removed. 

This will provide a vapor barrier. 

There is no smoking allowed inside any of my units, of anything - no e-cigs, vapor, cigarettes, cigars, pipes, bongs, joints, whatever.