I am having a new bathroom installed in my existing basement. I just had the rough-in plumbing inspection done (passed thank God!). As the plumbing inspector was leaving he said “Make sure you call for the ‘Vapor Barrier’ inspection before you lay the concrete in the floor.”
Basically what I did was bust up the concrete floor and dig down so the plumber could install the waste pipes. I had planned on putting back some of the excavated dirt, then gravel, then concrete. I did not know I needed to put a “vapor barrier” down. The house is 90+ years old, I doubt there is a vapor barrier under the rest of the basement floor.
My questions are:
1. Do I need a vapor barrier? If so, what thickness and what product/brand?
2. My trench has a 90 degree turn, how do I seal where the two pieces of plastic meet?
3. What is the correct installation steps that need to be done?
Thanks for the help!