Thank you very much for your very quick reply. None of the sewer pipes that run in the house are under anything important (e.g. beds, alter, stove, etc...). It is a one story home, so there are no sewer pipes above heads. Yes, I found your article before I asked you a question. Thank you for the information. We are fortunate to live on a large acreage with no chance of others sewer pipes near us. And we have checked and there are no waterways under the home. Sounds like we are in good shape. Thank you!