SWS Detail: 7.0301.1 Pipe Insulation
Author: Burl Kinoshita
Uninsulated water heater lines
Properly sized and installed pipe insulation
Interior diameter of insulation sleeve must match exterior diameter of pipe.
Pipe insulation must have a minimum R-value of R-3.
Must have vapor retarder.
If installed outside needs to be UV-protected.
Pipe insulation must have a clearance of 6 inches away from single-wall vent pipe .
1 inch away from B vent pipe to prevent a fire hazard
Install continuous insulation on the first 6 feet of both hot and cold water lines from the water heater, including elbows, unions and other fittings.
Install pre-fabbed insulation fittings at elbows and tee's or fabricate on site.
Fittings insulation must be tight and continuous.
Install pipe wrap clips or zip-ties as needed to secure all fittings and seams.
Lateral seams should be secured at a minimum of every 12 inches. (manufactured adhesive seam seal is NOT sufficient)
Follow steps 1,2,4,& 5 to Install continuous insulation on water lines outside the conditioned space to prevent freezing.