Bathroom help?
Answers:
Look underneath a sink and you will see a "U" shaped pipe called a pea trap. When you pull the plug to drain a sink, water remains in this trap preventing sewer gasses from coming up through the drain. The same type of trap is built into a toilet. It is one reason your toilet always has water in it. Unless your bathroom fixtures are vented properly, when you drain your sink or flush your toilet, the water in these "traps" will often be siphoned out, hence the opportunity for sewer gas to make its' way into your bathroom. Is there water left in the bowl of your toilet after flushing? When you put your head down in the sink and sniff the drain, is there a strong sewer odor? If the answer to either of these questions is "yes", you have an inadequate or nonexistant venting system.
If you installed a venting system and water remains in the traps, perhaps you made the mistake of not running the vent through the roof. A common mistake for "do-it-yourself" plumbers to make is to just run the vent into the attic and not run it through the roof. If you did that, your attic will have a strong smell of sewer gas and that gas is probably finding its' way back into your bathroom through the ceiling exhaust fan if one was installed. Another common mistake "do-it-yourselfers" make is to just run the exhaust fan pipe into the attic instead of through the roof. If you also did that, you have created wide open path by which sewer gas is finding it's way back into your bathroom.
With the use of PVC waste pipe, many homeowners are now able to tackle some fairly complicated plumbing jobs. Unfortunately, many also take shortcuts or fail to design the systen correctly in the first place. It's time to hit the plumbing books at your local library. Did you design and execute your plumbing plan correctly? If not, it is time to fix it.
Good luck with your project.
Other answers:
first of all you can't have straight pipes running down...you nedd the curved water trap pipes, they are what keeps the odor away
first of all you can't have straight pipes running down...you nedd the curved water trap pipes, they are what keeps the odor away
first,do you have a p trap or an s trap on your sink??if so its not coming from there, if not then it probably is coming from there...the toilet has its own trap,if the sink is ok then you may have to change the wax ring on the toilet...