The most obvious sign is a backup, either from a fixture or from a floor drain. Other signs include:
Every home owner should be knowledgeable about their sewers and drains. It is necessary to have them cleaned periodically. The main sewer line should be clean and drains should be grime-free.
$67.90
No
You may not have a backflow preventer in the main line. This prevents anything coming back from the main line. It may be coming from your neighbors above you on the line.
The drain pipe has a blockage somewhere downstream from where the toilets are connected to the main sewer line from the house. All the drains in a house normally connect to one main line that either goes to the city sewer system or your septic tank. If you know where the sewer line exits the house, you could check there to see if the blockage is in the yard. Most sewer blockages are caused by tree roots, broken fittings, or crushed pipes. Good Luck
One drain outlet is sufficent provided the drain outlet to the sewer line or to the gully outside has the correct gradient fall.
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The answer is yes but the question is "why". It would require twice the expense as the two drains would require double the work and pipe to eventually tap into the main sewer line. But the answer to the question is yes.
With a sewer line locator of course
Most likely there is a problem with the main drain. Tree roots can get into small cracks and plug the line, it can collapse or break. If it breaks, the ends can shift so that the opening is too small to drain properly. First thing is to have the drains cleaned with an auger. If the line cannot be cleared to the main sewer line or septic tank, measuring how far you get will let you know about where the problem is and the possible cause. If it is tree roots, where is the blockage in relationship to any trees.
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