My recent post called “Is green building dangerous?” raised a number of comments. In the post, I mentioned a project that had won a significant green award but was “poisoning” its inhabitants. One commenter asked for more information on the subject, so I went to Dan Morris, the indoor air quality specialist mentioned, for specifics on the project. Here is his response (WARNING, may be overly technical):

Morris said the problem with the green house in question was the location of things. It had a large gas water heater used to heat the hydronic infloor heating and domestic hot water that was in a small laundry room with a washer, dryer, an exhaust fan and a fixed window. The occupants were not “poisoned” (as I originally stated) but were exposed to somewhat elevated levels of carbon monoxide over long periods in the house (either way though, it’s not good for you). 

Morris said the carbon monoxide and other trace pollutants found in the flue gasses from gas combustion were drawn into the house whenever the dryer or exhaust fan was operated when the water/space heater was operating. The dryer or exhaust fan took air out of the laundry room with no provision for make-up air from outdoors. The only open hole to the outdoors was the water heater flue. The make-up air was drawn down the flue pipe and back drafted the water heater. In short, it was out of balance and pressure.

In Morris’ words: “What was so disturbing about this house was that no one understood the basics of building science, or were not paying attention. This includes the: architect or building designer, builder, homeowners, code officials/inspectors, green building award people.”

Obviously, this isn’t every green designer or builder or award program… but how common is it? And whose responsibility was it to notice that all those things should not have been in the same room?

Another commenter, SteamboatEcoBroker, said with newer green buildings, air quality and ventilation systems are a must because they are much tighter than older buildings. So should more attention be paid to the air quality systems in a green building? Do green building systems focus too much on energy and not enough on other important aspects?

If you have any insights, please share them with me below.