Naah...Put it this way the chances of such an unsual occurance are so remote that odds are greater than winning Powerball..Just a guess.
Actually, you have better chances at getting hit by lightning twice, than winning the Powerball; even when you are not on a hill.
As said/implied, I believe a gas leak inside the home building up concentration would be more of a concern; but I would avoid it.
However... If it's tied to a 3 to 4 inch diameter pipe between a natural gas pump and a residential meter, may I recommend sleeping at least on the other side of the house.
Although this is he said/she said... I don't believe any judge would go along with the claim that "a customer signing a work-order that services were performed, means the customer is smarter than a certified engineer and/or building inspector and certifies that the work is in accordance with all National, State, County, and/or Local Codes and releases all other parties from any liability."
And if it's not done according to code, your insurance company will have various thoughts about paying.
Call your local building inspector/code enforcement office and see what they have to say. They might want to have some occupational licenses suspended.
