What is the maximum temperature allowed from a constant heat source behind drywall?

What is the maximum temperature allowed from a constant heat source behind drywall?

• A. 90
• B. 135
• C. 115
• D. 125

Answer: (D)

The main idea is to limit heat buildup in wall cavities to protect the wall assembly and people from heat stress. When a heat source runs continuously behind drywall, the surface on the room side should not get hotter than a safe threshold. The established limit is 125°F (about 52°C). Keeping the drywall surface at or below this temperature helps prevent damage to finishes and insulation, reduces the risk of heat-related hazards, and lowers the chance of burns if someone touches the wall. If a heat source in a concealed space could drive the surface above this limit, you’d need additional clearance, shielding, or to relocate the heat source.

The main idea is to limit heat buildup in wall cavities to protect the wall assembly and people from heat stress. When a heat source runs continuously behind drywall, the surface on the room side should not get hotter than a safe threshold. The established limit is 125°F (about 52°C). Keeping the drywall surface at or below this temperature helps prevent damage to finishes and insulation, reduces the risk of heat-related hazards, and lowers the chance of burns if someone touches the wall. If a heat source in a concealed space could drive the surface above this limit, you’d need additional clearance, shielding, or to relocate the heat source.