Over Wood

  • Pex Pipe is stapled down to the wooden subfloor.

  • The secured pipe is then covered with concrete, Level Rock gypsum, or mortar and membrane. 

  • This method is a relatively inexpensive, the quickest to install, and provides the most responsive performance.


We have several installation methods for Warm Floors including Staple-Down over Wood, Staple Down Over Concrete, Hilti-Down, Tie-Down, HeatPly, and Staple-Up.

Which installation method we use will depend on several factors like floor construction technique, floor height availability, finished floor type, budget constraints, performance needs, and project time constraints.

Warm Floors Installation


Over Concrete

  • A layer of rigid foam insulation is installed atop the existing concrete slab.

  • Pex Pipe is fastened to this foam using plastic staples.

  • The secured pipe is then covered with concrete or Level Rock gypsum.

  • This method is used to insulate an existing concrete slab before installing Pex Pipe.

  • The use of rigid foam over existing concrete is preferred because it increases response time of the system.


to Concrete

  • Pex Pipe is fastened to existing concrete slabs using powder-activated nails (aka Hilti Nails) and half round conduit clips.

  • The secured pipe is then covered with concrete, Level Rock gypsum, or mortar and membrane. 

  • This method is only used in projects where there is an existing concrete slab and where surface insulation is not required.


in Concrete

  • Pex Pipe is tied down to metal rebar or 6"x6" mesh inside of a new concrete slab.

  • The Tie Down method is used when there is a new concrete slab.

  • While inexpensive, this method offers a slower response time because the heat must warm the concrete slab before radiating into the building.


  • 5/8" thick Plywood with precut grooves is screwed and glued to subfloor.

  • Pex Pipe is pressed into the precut grooves.

  • HeatPly is directly covered with finished wood flooring. Finished tile or carpet require an additional substrate.

  • This method is used only when floor height is limited to 5/8".

  • HeatPly is the most expensive application.


  • Pex Pipe is stapled up underfloor to subfloor or joists. The secured pipe is then covered with foil-faced fiberglass insulation.

  • Staple-Up is only used when there is already a finished floor in place and there is no other option.

  • It is slow to install, slow to respond, and labor intensive.

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