Need help with restorative floor maintenance. Drain traps can cause IAQ problems when water in the drain trap evaporates due to infrequent use. If the building interior is under negative pressure, soil gas or sewer gas can be drawn indoors through a dry drain trap. Confirm that all drains have drain traps. Install traps on any untrapped drains.
All drains have drain traps.
Need help with traps. Confirm that all drain traps in areas which only you have access are filled. Check water in seldom used toilets once each week. If low, flush. Traps are filled at least once per week.