The Inner Working of PVC Pipes
Many people dread plumbing, and for good reason; it can be very complicated, and if it is not done right, can cause more problems than before. I will be the first to tell you that I am not a master of plumbing, but what I will do is answer some of the burning questions you may have about PVC plumbing. There are many different types of materials used for plumbing, but I will only be covering PVC for this article. Below are just a few facts about PVC
- Why use primer? PVC primer is an essential part of plumbing with PVC pipes. Primer readies the surface for the PVC cement by cleaning the surface and helps the cement adhere better to the surface of the pipe.
- What is the difference between PVC and CPVC? CPVC is engineered to withstand water at higher temperatures, therefore is more commonly used in running water supply lines. It is manufactured in widths up to 1" (we carry up to 3/4 CPVC in the store) PVC is white, and cannot withstand temperatures that high. PVC come in sizes from 1/2" in diameter, up to 6" in diameter (the larger sizes are used for drain pipes).
- Why use CPVC for all supply pipes? You absolutely must use CPVC for all hot water lines, as PVC cannot handle the hotter temperatures of water. Technically, you can use PVC for cold water lines, but most plumbers will use CPVC for both simply because they already have the pipe and fittings. Plus, it is easier for those who are not plumbing-literate to distinguish between supply pipes and drain pipes. In addition, some of the measurements can vary between 1/2" CPVC and 1/2" PVC.
- What size of pipe should I use for drain pipe in my house? The old saying goes, bigger is better, and this is no exception for drain pipes! The pipe coming directly from sinks should be a minimum of 1 1/4", but a better size is 1 1/2". From toilets, the minimum you can install is 3", but if you live in fear of clogging your pipes, install 4" pipe.
- What are the markings on the pipes and fittings about? You will notice on larger PVC pipes (1 1/2 inch and larger) will have a long line (blue on our current supply), and the fittings will have raised notches on them (the elbows, not couplings). These are there to ensure that you will line up the pipes at the correct angles you need. You may think you don't need to use these, but once the cement is on the pipes and fittings, it has a very limited working time, therefore making the markings on these fittings and pipes essential.
- If my PVC drain pipes become clogged, what can I pour down the drain to unclog it? Be sure to read your labels first and foremost! Liquid Plumber or Drano will work well in PVC pipes. Some people swear by acid, but before using this dangerous substance, READ THE LABEL! You can also use the enzyme eaters for preventative maintenance.
- If I am burying PVC pipe, how deep do I need to bury it? It depends widely based on what area you live in. The general rule of thumb is the colder climate you live in, the deeper your pipes should be. In our area, the frost line is at 3 feet, so if you are installing any underground pipe, be sure that it is at least 3 feet deep (many trenching companies will go at least 4-5 feet).
