Yes, crawlspaces and basements where the gas can build up underneath a home and seep in. If the house does not have a crawlspace or basement I would doubt there would be much concern. Not every area has the necessity or elements needed to produce the gas either so that is why I said if the house had a basement or underground lower level that would be utilized quite a bit it would be important to check out what the composition of the earth beneath the home is compromised of.
Yes, crawlspaces and basements where the gas can build up underneath a home and seep in. If the house does not have a crawlspace or basement I would doubt there would be much concern. Not every area has the necessity or elements needed to produce the gas either so that is why I said if the house had a basement or underground lower level that would be utilized quite a bit it would be important to check out what the composition of the earth beneath the home is compromised of.