Type M copper shall be _________ before passing through concrete floor

Type M copper shall be _________ before passing through concrete floor

• A. Wrapped
• B. Insulated
• C. Soldered
• D. Painted

Answer: (A)

Copper tubing that passes through concrete floors must be wrapped to provide a protective barrier between the pipe and the concrete. Concrete is highly alkaline and contains moisture, which can corrode copper over time and lead to leaks. The wrapping (or a protective sleeve) keeps the metal from direct contact with the concrete and helps prevent moisture from wicking into the pipe. Soldering through the floor isn’t a practical or protective step once the pipe is run, insulating alone doesn’t address the corrosion risk in this scenario, and painting doesn’t provide lasting protection inside concrete. Wrapping is the standard method to safeguard Type M copper in this situation.

Copper tubing that passes through concrete floors must be wrapped to provide a protective barrier between the pipe and the concrete. Concrete is highly alkaline and contains moisture, which can corrode copper over time and lead to leaks. The wrapping (or a protective sleeve) keeps the metal from direct contact with the concrete and helps prevent moisture from wicking into the pipe. Soldering through the floor isn’t a practical or protective step once the pipe is run, insulating alone doesn’t address the corrosion risk in this scenario, and painting doesn’t provide lasting protection inside concrete. Wrapping is the standard method to safeguard Type M copper in this situation.