PLUMBERS SAN DIEGO: By far the most economical form of installation of sewer pipe is plastic piping (ABS piping). A long time ago say before the 1950s they used to install cast-iron piping. And if you want to go back hundred of years or more clay pipe was used anyways.
Although, that being said. Plastic piping must be kept out of the sun (UV-rays melt or bend pipe), so that is why it is always installed underground, metal pipe above ground, or cast-iron pipe. Must be Installed when exposed to the Sun because of the UV ray's will cause it detiorate or basically melt. And should be have a minium of 12" of earth cover.
The lifetime of ABS is similar to that of cast-iron 50-65 years, I would say depending on installation (not installed on rock(s), but sand or rather on what is called soft dirt), 50-70 years is the minimum life expectancy. And can even last more years. Has noticed this Plumbers San Diego.
Although some of the things that can destroy ABS plastic piping are the following: the use of Chemicals Including Root Destroyer, any kind of chemical, also like drain cleaners affect the washers on the drain connections. That is why when medical buildings are done in cast iron pipe well at least the Main Underground.
And hopefully also that we don't get a major earthquake like the one that occurred a while back in Japan, 9.0 on the Richter Scale. Remembering, That We live on what is called the San Andreas Fault Line.
Actually I have on occasion removed sewer piping (cast iron piping) 70-80 years old which was still some what usable. Unlike Clay Pipe. Which was incredibly still in pretty good shape. Clay pipe still lookes like new even after 70 + Years? Clay Pipe seems to last forever, so maybe we should switch to Clay Materials, LIke what was used in the Roman Times? just kidding says this Plumbers San Diego.
This Plumbers San Diego analogy is to always try to check the grade every couple of feet, (or what is called the pitch or the fall or called the drop) with a torpedo level. Code says 1/4" of an inch per foot for 3" abs piping, and 1/8" of an inch for 4" inch abs piping. Because I have found many that didn't have any grade.
Which I always try to use the 1/4" of inch grade or drop per foot. Plumbers San Diego, also Recommends to check your local San Diego Plumbing Repair Building Requirements before doing any installation.
On occasion if your not able to use the 1/4" drop, the most important thing to remember is to always have a drop, (a grade, a fall this will really help in never or rarely getting stoppages, haveing fall).
Plumbers San Diego, likes Using street fittings or using a santee on its back as a vent only if that is the only way that it can be done, depending on the situation or a Wye and a 45 for the toilet (of course that being because the toilet is the one with the biggest fittings).
In other words since the Toilet is what needs the Biigest Drop. And so which is your biggest fall for pulling a measurement, or for laying out for a rough-in measurement for a new construction plumbing project. Using STREET FITTINGS maybe be a Great Choice so you get A GOOD DROP. It all depends on How much is the distance to the sewer main, from the toilet.
These Plumbers In San Diego always recommend to call a professional for any Plumbing Repair, to do the work.