Hydronic radiant floor heating systems should not be installed under the _________.

Hydronic radiant floor heating systems should not be installed under the _________.

• A. Ceiling joists
• B. Floor joists
• C. Rafters
• D. Studs

Answer: (B)

Hydronic radiant floor heat is meant to emit heat upward from the floor into the room. For efficient, even heating, the tubing needs to sit in the floor assembly where heat can readily move into the finished floor. Installing the tubing under the floor joists places it behind wood that slows and blocks heat transfer, creating cold spots and reducing overall heat output. Therefore, keep the tubing in the floor area where it can directly heat the finished floor, not under the joists.

Hydronic radiant floor heat is meant to emit heat upward from the floor into the room. For efficient, even heating, the tubing needs to sit in the floor assembly where heat can readily move into the finished floor. Installing the tubing under the floor joists places it behind wood that slows and blocks heat transfer, creating cold spots and reducing overall heat output. Therefore, keep the tubing in the floor area where it can directly heat the finished floor, not under the joists.