New roof and a company is coming in to install a radon mitigation system so the basement is getting a vapor barrier installed all before I even close on the house.

Wear nitrile gloves and a respirator with organic vapor cartridges.

It looks like you may have captured a free floating full torso vaporous apparition there.What are your plans for the rehab, if you don't mind me asking?

They include:Solid phaseLiquid phaseGas phaseThink of them as ICE, Water, and Water Vapor.

Vapor barrier is ok as long as you realize that is what it is.

Once the floor is clean, follow by an application of a vapor sealant product specifically for concrete (we sell this)  and an epoxy concrete floor coating. 

The downside is tremendously reduced when buying at 26%, 35% and 33%.Your margin is 16% and the top 10% doesn't count because its vapor and if not vapor is closing costs and holding costs plus.

Didn't read all of it.When you buy carpet you can get a plastic vapor barrier put in underneath to try and protect the floor.You can turn off the lights and take a black light to show all the urine stains.

Hardwood will require a vapor barrier and screeds.  

Many RE text books have exploded views of a house, showing the parts from the vapor barrier at a foundation up to the overlap of shingles, the ridge cap at the top of a roof.