Home Inspection Blog

Polybutylene Piping aka Grey Piping

Polybutylene piping can be found in homes and condominiums in our area that were built between 1978 and 1995. However, it has also been found in homes after 1995, possibly from plumbing companies’ leftover stock.

YEAR RANGE: Manufactured from 1978 through 1995. The final stop date for installation in homes and buildings after 1995 is unknown.

Description: Polybutylene is typically grey and sometimes white in color with a dull finish. It is often difficult to locate because most plumbing piping is in the walls, under slabs, or under attic insulation. In many homes or buildings where polybutylene exits the walls, such as under bathroom sinks and at water heaters, it is fitted with copper piping, which is used for connecting the plumbing fixtures, etc. So, it can appear to be a copper piping home; however, all the hidden piping is polybutylene. For confirmation, a common stamp found on grey polybutylene piping is "PB2110." See photo.

PROBLEM 1: The piping reacts with oxidants in the water supply, causing it to become brittle and fail. The water supply composition determines how long the piping will last. Failures occur without warning.

PROBLEM 2: Many insurance companies will deny coverage for properties containing polybutylene piping.

SOLUTION: Replace the polybutylene with modern, reliable piping, such as CPVC or PEX.

COST: The average cost to re-pipe a home with polybutylene piping can vary depending on several factors, including the size of the home, the complexity of the plumbing system, and the type of replacement piping used. However, here is a general estimate, but prices in the industry change quickly so don't commit to theses estimates without getting a current quote,

• Small Homes (1,000 to 1,500 sq. ft.): $3,000 - $5,000

• Medium Homes (1,500 to 2,500 sq. ft.): $4,000 - $7,000

• Large Homes (2,500+ sq. ft.): $5,000 - $8,000 or more

These costs include labor, materials, and any necessary permits. It's always best to get a personalized estimate from a licensed plumbing contractor, as specific conditions and local labor rates can significantly impact the overall cost.

Photo: showing the “grey piping” and PB2110 stamp