Resistance to Closed Crawl Space in Zone 4C
Our house project in Zone 4C is nearing the point where we are going to sign a contract. I am planning the equivalent of a Pretty Good House: 60-40-20-10, with a closed crawl space. In our county, radon mitigation is required. After soliciting foundation and framing bids, the developer is giving me resistance on this. He has written to me, saying this:
“Being temperate moist climate, the concern is that moisture control is an issue and (in our county) radon is another potential concern. The conditioned crawl space creates a potential health hazard because of inability to ventilate affordably radon gas which comes naturally from the earth.”
Bottom line, he thinks it’s going to cost too much money to do radon mitigation with a closed crawl. I, however, don’t see how you can have a tight house with an open crawl space. It seems to me that if you turn on a blower door with an open crawl, a thousand tiny fountains of air will come up from below.
Could I have some advice on this, please?