When they moved out, I had to put in $2K of new carpet, after I painted every floor with Killz to because I could not get the odor out I finally painted the walls too because the smell would not go completely away.

Theodore Lehmann Welcome to BP!

Originally posted by Theodore B.

If there are odors present, try to eliminate the source of the odor.

You are literally "hermetically sealing" the odor in.

In case they tenant tries to sue me, I got two written quotes from odor restore companies that also states the odor at the house. 

They found this out the hard way when they turned the heat on and just about keeled over from the odor.

@Daniel RubensteinIf the seller claims they will take care of odor removal get it under contract with a contingency, make it clear that if the odor is not gone by the the contingency you will not purchase the property, also make it clear that YOU will make the final determination with regards to the final status of the odor.If you feel the house is overpriced then offer what you think its worth, you can always move to Vegas rent a place and wait for a place that better suits you and your family.Good Luck!

The odor in the garage was unbearable with dog urine and mouse feces.

The vapor barrier should help in keeping the moisture off of the floor insulation.Vents will help with the movement of air and assist with the odor problem.