“When gas leaks outside the wall can’t go into the air, they travel to the foundation and to every opening… if a foundation is porous or cracked, that is how it gets in”
How a Gas Leak Can Destroy a Building
So many homeowners DO HAVE one or more EXTERIOR cracks or other exterior openings, like these… https://www.youtube.com/watch?v=(http://kdvr.com/2017/09/brighton-family-narrowly-escapes-unusual-natural-gas-leak-into-basement/)
GAS line :45… water line 1:10 see any exterior openings…? Installing interior drain tile, drainage systems, pffffttt-pressure relief systems do NOT waterproof any of those. Insects, mice etc enter through these same type of exterior openings https://www.youtube.com/watch?v=b590J2E6he8)