Forgive me if it has been asked before but I am new to this NG.
I have noticed that a lot of the homes going up around my development have little green or white (air?) lines that run around the windows and doors in the frame of the house and all run back to a central location. They seem to be about the thickness of about 16 ga. or 18 ga. wire but they are hollow plastic like air lines. I have noticed these with many builders, not just one. What are they for?
If it makes any difference, I am in the Phoenix Arizona area.
Thank you for any help.
Chris