Under frost protection rules, which situation does not require frost protection for building sewers?

• A. All sewers require frost protection
• B. Sewers within 30 feet of the building where snow is not removed
• C. Sewers located 60 feet away
• D. Sewers within 5 feet must be frost protected

Answer: (B)

Frost protection is used to keep building sewers from freezing when ground temperatures drop. Snow on the ground can act as an extra insulator, slowing heat loss from pipes.

If a sewer runs within 30 feet of the building and snow is not removed, that insulating snow blanket reduces the chance of the pipe freezing enough that frost protection isn’t needed. The other scenarios either place the sewer in a situation where frost protection is normally required (very close to the building) or don’t rely on that insulating effect, so frost protection would still be necessary there.