It used to be that about 5-10% of home buyers did radon tests. But home inspectors must have gotten discounted memberships to the National Society to Eradicate Radon in Our Lifetime. Now, about 70% of buyers do radon tests. Well more than half of the radon tests flunk. The seller has to install a radon mitigation system for about $1200.00. That consists of capping the sump pump pit and using a small fan to push all of the radon gas through a pvc tube outside. Radon has a standard of 4.0 pcl or less. Anything higher than that has to be mitigated (brought down to under 4.0).
Those same inspectors are crawling into the attics of homes and finding boatloads of mold on the plywood sheathing. The mold appears because bathroom fans were vented into attics and over many years, mold grew. If mold is found, then the seller has to have a mold remediator get rid of the mold. That costs between $1200.00 and $3000.00. The mold remediation business has grown tremendously in the past few years. I wrote this post in 2004 saying that mold problems were increasing, so this is not an overnight occurrence, but since then they have exploded.
Mold is found by the home inspector by simply looking at the plywood in the attic of a house and if there is mold there is a dark staining on it. There are two approaches to mold remediation once it is found:
1. An Industrial Hygenist (who is paid about $400-$500) tests the mold then draws up a remediation plan for a mold remediator (other than the hygenist) to work on.
Most sellers taking the route described in number 2. Many times the mold will not be harmful or will be in a small area. Since the parties are in the middle of a real estate contract (and there are people who could get sued) everyone takes a scorched earth, remove every spec of mold approach.
I see little to no testing done. My opinion is that air quality testing is a waste of money. I was surprised that the Illinois Department of Public Health has NO STANDARDS for mold testing and does not recommend testing the mold or the air at all. So why is everyone freaking out and removing all this mold? I’m not sure, but buyers want the mold gone, so that’s what happens. The unlucky seller whose buyer gets a flunking radon test and a flunking mold test will be out of pocket $2500.00 or more before he knows what hit him.
Here are some mold remediators that I have seen on files: