WAC 51-11R-40330. Section R403.4 — Mechanical system piping insulation

R403.4 Mechanical system piping insulation. Mechanical system piping capable of carrying fluids above 105°F (41°C) or below 55°F (13°C) shall be insulated to a minimum of R-6. EXCEPTION: Up to 200 feet of hydronic system piping installed within the conditioned space may be insulated with a minimum of 1/2-inch insulation with a k value of 0.28. R403.4.1 Protection of piping insulation. Piping insulation, including termination ends, exposed to weather shall be protected from damage, including that caused by sunlight, moisture, physical damage, and wind, and shall provide shielding from solar radiation that can cause degradation of the material. Protection shall be removable for the exposed length or no less than six inches from the equipment for maintenance. Adhesive tape shall not be permitted.