Incorrect Pipe Sloping

• Proper Slope for Drainage: Ensure that the pipes are sloped correctly to allow for effective waste flow and to prevent siphoning out of P-traps, which could lead to sewer gases entering the house.
• Importance of Venting: Proper venting is necessary alongside appropriate sloping to prevent negative pressure in pipes.

Not Installing Water Hammer Arresters

• Preventing Water Hammer: Installing dedicated water hammer arresters is crucial to prevent knocking in pipes, especially near appliances with fast valve closing, like toilets and washing machines.

Reusing Flexible Hoses

• Checking Hoses: Inspect flexible hoses (speedways) regularly. They typically have a lifespan of around five years and should be replaced if there are any signs of wear, frays, or leaks.

Using Lead Solder on Potable Water Systems

• Using Safe Materials: Avoid lead solder for potable water systems due to its harmful effects. Instead, use a mix of tin and antimony which is lead-free and safe for drinking water.

Not Deburring Pipes

• Deburring for Smooth Flow: Always deburr the inside of pipes after cutting to prevent turbulence and potential leaks. This can be done with a round file, utility knife, or built-in tools on pipe cutters.

Improper Cleaning of Pipes and Fittings

• Cleanliness for Solid Joints: Ensure that pipes and fittings are free of oxidation and debris before soldering. Use fitting brushes or abrasive materials for effective cleaning.

Not Isolating Exterior Hydrants in Winter

• Winterizing Hydrants: To prevent bursting from freezing temperatures, insulate exterior hydrants or install non-freezing hydrants that close the water inside the house.

Incorrect Pipe Hanging

• Proper Support for Pipes: Hang water lines every 6 feet or so to prevent weakening and potential failure at joints. This is especially important for copper water lines.

Incorrect Application of Pipe Dope and Teflon Tape

• Correct Order of Application: Apply Teflon tape first, followed by pipe dope if desired. This sequence ensures a cleaner finish and reduces the likelihood of leaks.

Stripping or Cross Threading Pipes and Fittings

• Careful Threading: Start by threading fittings by hand to prevent cross-threading. Use a counterclockwise motion to align the threads before tightening with a tool.