Pre-insulated Wirsbo hePEX™ features oxygen-barrier PEX pipe encased in
polyethylene-foam insulation to meet ASHRAE 90.1-2013 energy-code
requirements for hydronic piping and radiant heating/cooling applications.
The piping is approved for direct burial in soil provided it is not exposed to
groundwater. Uponor recommends adding 1/2" of insulation to accommodate
for foam compression in direct-burial applications.