I have signed a contract for a house, built in '54 with a frame of blåbetong. Foundation walls of concrete and floors made of poured arches. The house is 1½ stories with a basement. The contract included a clause that allows me to cancel the purchase if the radon level exceeds the recommended value.
Received the report (long-term, conducted in an uninhabited house) on Friday, and it shows an average value of 320bq/m3 (+/-40). Conducted on the ground floor and upstairs, same value in both.
Trying to negotiate a radon inspection, but don't know how that's going yet.
Any spontaneous opinions, views, or experiences?
Blåbetong is always blåbetong, but the value still doesn't feel so high that it couldn't be ventilated down to about 200? Then there's always the worry about future depreciation...
Received the report (long-term, conducted in an uninhabited house) on Friday, and it shows an average value of 320bq/m3 (+/-40). Conducted on the ground floor and upstairs, same value in both.
Trying to negotiate a radon inspection, but don't know how that's going yet.
Any spontaneous opinions, views, or experiences?
Blåbetong is always blåbetong, but the value still doesn't feel so high that it couldn't be ventilated down to about 200? Then there's always the worry about future depreciation...
Just because it is blåbetong doesn't mean it contains radon. Hire an inspector who knows radon. The municipality has lists of approved/trained radon mitigation professionals. A survey costs about 3000 SEK. He will tell you where the radon comes from. If you're lucky, it's ground radon, and then you install a radon fan and seal the leaks in the slab. You can get back half of the cost, up to a maximum of 15000 SEK, from the county administration. The average level is not alarmingly high; the limit is 200 Bq. Let the seller cover the mitigation. Good luck
Of course, they don't have to be blåbetongen, but it's quite likely since it's available. Also, after reading threads here, it seems that a relatively low value often indicates the concrete. But as I said, I want to get an inspector there to find out where it's coming from more precisely.
Definitely sounds like there might be blåbetong! The question is just where/how much and how much radiation it emits. Check if you can borrow or rent a Geiger counter from your municipality! If so, you can easily check this yourself.