New house, in about a year. Have noticed occasional sewer gas smell coming from downstairs (on slab) rarely used tub. Running water to replenish p-trap works, but not as well now as before. Continous drip does work. Short of breaking concrete what might repair options be?
Are you certain the trap is even hooked up? Many times a trap is by accident left off the tub in haste, the waste will drain into the subsoil and go un-noticed for a long time. Have a look under there and see if the trap is even there. Aside from that, there are specific distances required between fittings on a sewer line to prevent the siphoning of a trap by the discharge of another fixture. WIthout seeing it, it is a shot in the dark to diagnose. Was the home built in an area that has inspection required of the plumbing contractor?
You may be right about a siphoning problem. Even with a continous drip, which would ostensibly keep a leaking P-joint full and water-sealed, I am still occasionally getting a major sewer gas smell. This bathroom in on a concrete slab. The tub is apparantly offset from the P-joint so I can’t see downward ver far. Do you thinkg a plummer with some sort of orthoscopic device might be able to see what the problem is?