Maximum length of CSST supported on blocks

Maximum length of CSST supported on blocks

• A. 12 inches
• B. 48 inches
• C. 72 inches
• D. 24 inches

Answer: (B)

The main idea is that CSST must be secured at regular intervals to prevent sagging and damage. Because CSST is a flexible piping material, the code limits how long a run can span between supports. The maximum distance between supports for CSST is four feet, so the longest run you can place on supports like blocks without needing an intermediate hanger is four feet (48 inches). This helps keep the tubing properly supported and protected from movement or impact, and it aligns with manufacturer and code requirements. Shorter spans would require more supports, while longer spans could exceed the allowable limit and risk damage.

The main idea is that CSST must be secured at regular intervals to prevent sagging and damage. Because CSST is a flexible piping material, the code limits how long a run can span between supports. The maximum distance between supports for CSST is four feet, so the longest run you can place on supports like blocks without needing an intermediate hanger is four feet (48 inches). This helps keep the tubing properly supported and protected from movement or impact, and it aligns with manufacturer and code requirements. Shorter spans would require more supports, while longer spans could exceed the allowable limit and risk damage.