The toilet is the lowest point, fluids seeks the lowest level, other sewage is coming up through your basement toilet. The system might be installed wrong or there is a blockage in some discharge pipes. Call a plumber, it can be really bad, when I was a kid we had our whole basement flooded with two feet of raw sewage after a big rain storm.
Do you have a sink or basin in your basement? If so, and it has not been used in quite a while, the water in the "S" pipe could have evaporated, allowing odors from your septic system to come up through the pipes. That is the purpose of all drain pipes having the "S" shape. Many codes do not allow an S trap as it can lose its seal quite easily. One cause for the smell besides trap seal loss which would be very visible in a toilet would be that the wax gasket has deteriorated, and needs to be replaced. Also, check for any floor drains as the P trap or running trap could have trap seal loss.
Take the toilet off and check the WAX RING..replace the wax ring
That would make for an awfully low toilet.
That would be your flush valve in the tank
You may need to replace the wax seal under the toilet.
Yes... is the short answer. The toilet has a trap in itself. You would have to be able to break out the floor and put a P trap in the existing line
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Would you rather poop on your bedroom floor and have to smell it and step in it?
Oil that has somehow gotten onto the manifold of the engine will produce this smell. Any oil leak in and around the engine will produce this.
The musty smell of moisture and possible water marks would indicate that there is a problem with water.
There is a blockage in the waste line. Have you flushed the basement toilet to see what happens? Try running the upstairs shower and see what happens. (use two persons , one up stairs, one downstairs so you can control the amount of water that rises in the toilet.) There should be a "clean out" cap somewhere downstairs near the point where the waste line exits the house. It is here that one would "snake" the line. The other possibility is the water level in the downstairs toilet is lower than the level of the waste line exit. This means that the point of exit of the line is physically higher than the toilet. The only remedy for this is to raise the toilet to above the height or replumb the toilet into a waste pump that evacuates upwards to a point slightly higher than the waste line. This is the most common set-up in a "basement" toilet. The toilet evacuates into a point lower than the floor. The waste pump or grinder pump then pumps the waste upwards than gravity allows it to evacuate normally. The benefit is that the waste pump creates a separate system for the basement toilet. Y-THINK-Y
If you just plan on putting the toilet on top of the floor drain the answer is no. The floor drain if it leads to a septic system or city sewer would have a trap in the line which will not work with a toilet. Depending on the size of the pipe 3" minimum you could cut the floor and tie a toilet into the line. It would also have to be properly vented. I would consult a plumber on the job. Its also possible that the floor drain just goes to a dry well which could not be used. Even if it could not be used there are other ways to install a toilet below the septic or sewer line.
not if they're still cold to the touch. rinse wel and smell the meat before cooking. That will depend on the temperature of the unheated basement. If the basement is as cold as a refrigerator, then they'd be OK. If the basement is warmer than a fridge, then the ribs could have spoiled are not OK.
I would think if you leave an apple anywhere for 3 days it may begin to smell. - I usually keep my apples in the fridge.