my house was built in 1979. I've seen some questionable things pertaining to how the house was built but overall it seems that the builder kept to the codes. now,I'm putting in a small bath in the basement and I've run into a strange situation which will require some extra work to run the hot and cold water pipes where they need to go.it seems that the wall of my "utility room" (that's where the bathroom's going) that faces the garage is not a regular wall built with 2x4's but rather it's the foundation wall with "sheetrock" attached right to it. I removed a chunk of the sheetrock and yes it DOES appear to follow some sort of code since between the sheetrock and concrete there's a kind of "barrier" with a shiny,foil side facing the room (I guess to reflect the heat). that concrete wall is not really an outside wall since I think it merely has a lot of dirt behind it and the garage floor is on top of THAT. so,what do you guys think,is this "normal"?
BTW: the room IS pretty narrow so maybe this was done to save 3.5"