I am experiencing a strong smell of "sewage" in my bathroom (and sometime outside the side of the bungalow next to bathroom). This smell is intermittent and NOT linked to use of toilet for #2's.

To complicate things the bathroom has a 2 - 3 feet void underneath the tiled floor. The floor is not tiled underneath the bath.

My 11 year old bath has a "coating" of something on the base of it (some sort of insulation?), could this be causing a smell, as when I take the panel off there is a smell?

  • Check that your vent stack isn't plugged. – keshlam Nov 28 '15 at 19:53
  • Can you provide a picture? – DMoore Dec 29 '15 at 8:21

Although your question is not detailed or specific enough to provide definitive answers, you should do these things:

  • Check the void space that you mentioned for signs of a sewage leak
  • Have a plumber run a camera down your branch and main sewer lines to check the integrity
  • Check your vent lines to ensure they are not plugged or restricted
  • Check for a drain that is not frequently used (like a hidden floor drain) and run some water down it to establish a seal in the trap if necessary)

Consider this:

  • It is not uncommon for drain flow(s) from another appurtenance to cause a siphon action in a tub or sink drain, resulting in sewer gases/odors entering the room. This is caused by inadequate venting and there are methods to abate it, call a plumber.
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