Interestingly, the NZ average data rose from 16 to 23 between the 80s and 2016, I wonder if it’s related to the rise in concrete slab houses where raised houses on piles with a crawlspace were previously the primary way houses were built. Granite countertops possibly play a part too.
Interestingly, the NZ average data rose from 16 to 23 between the 80s and 2016, I wonder if it’s related to the rise in concrete slab houses where raised houses on piles with a crawlspace were previously the primary way houses were built. Granite countertops possibly play a part too.
Could easily be better weatherproofing
One of the reasons I never worried about radon is I live in an older house that leaks lots of air.