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How often should hydronic tubing be fastened to rebar along straight runs?

  1. Every 2 feet

  2. Every 3 feet

  3. Every 4 feet

  4. Every 5 feet

The correct answer is: Every 3 feet

The hydronic tubing should be fastened to rebar every 3 feet along straight runs to ensure proper support and prevent strain on the tubing. This spacing allows for enough support without causing excessive stress on the tubing. The other options of every 2 feet, 4 feet, and 5 feet can either lead to over-support or under-support, potentially leading to damage or failure of the tubing.