This does not make it a green crawl space.
This homeowner has sealed his crawl space vents with poly-foam.
Everyone wants to get into the act, and be modern, and chic, and "save the planet." And he heard somewhere that the "new" trend is to seal crawl spaces and they will magically become "green."
To accomplish that, however, there are lots of criteria to be met. And minimally sealing the crawl space vents doesn't satisfy even one of them.
You can also see that here the insulation is crushed and reversed so the vapor retarder is facing the wrong direction.
One criteria in the "green" crawl space is the containment of moisture. Well, that is certainly not accomplished here. A whole lot goes into that!
Further, one of the vents was not sealed, and even had some sort of a fan placed there.
It was not plugged in.
And I don't know what someone is trying to accomplish here with that fan anyway.
That hose is attached to the backwash discharge tubing in the water softener equipment directly above. It connects into the main sanitary sewer drain shown in the other photo.
With that huge dip in the hose I expect the backwash function is less than effective. Maybe he thinks that is a trap! But that very nice try is info for another post!
My recommendation: if you are trying to improve the energy efficiency of any house, be sure to research it completely. Doing things that you "just heard about" may not be the way to go. The concept of "green" has been watered down and bastardized to the point where now it is almost meaningless. And sometimes things that are done can be damaging to the home and the living environment inside! When you do it, do it right!
Jay Markanich Real Estate Inspections, LLC
Based in Bristow, serving all of Northern Virginia.
Office (703) 330-6388 Cell (703) 585-7560