Type M copper shall be _________ before passing through ________ floor

Type M copper shall be _________ before passing through ________ floor

• A. Wrapped, Concrete
• B. Insulated, Wooden
• C. Soldered, Tile
• D. Wrapped, Wood

Answer: (A)

Protecting piping where it passes through a concrete floor is essential because concrete is abrasive and alkaline, which can damage a thin-walled Type M copper tube. Type M copper is the thinnest common copper tube, so giving it a protective barrier before it goes through the floor helps prevent nicks, scratches, and corrosion from the concrete and its moisture. Wrapping the pipe with an approved protective layer creates a sacrificial shield that keeps the copper intact during installation and service, and it also makes future replacement easier since the pipe isn’t directly exposed to the concrete. Insulation wouldn’t address the abrasion and chemical exposure as effectively in this situation, and the requirement is specifically about providing protection through the concrete floor, not about other floor types or extra techniques.

Protecting piping where it passes through a concrete floor is essential because concrete is abrasive and alkaline, which can damage a thin-walled Type M copper tube. Type M copper is the thinnest common copper tube, so giving it a protective barrier before it goes through the floor helps prevent nicks, scratches, and corrosion from the concrete and its moisture. Wrapping the pipe with an approved protective layer creates a sacrificial shield that keeps the copper intact during installation and service, and it also makes future replacement easier since the pipe isn’t directly exposed to the concrete. Insulation wouldn’t address the abrasion and chemical exposure as effectively in this situation, and the requirement is specifically about providing protection through the concrete floor, not about other floor types or extra techniques.