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Radiant Barrier Foil

Attic Applications

Much of the heat entering your home comes through the roof. Adding Rayblox HD® in your attic helps to keep your house cooler in the summer. Rayblox HD® is ideal radiant barrier to supplement the insulation already in your attic.

The Rayblox HD® brand radiant barriers are all available in perforated, allowing moisture to escape and avoiding mold and mildew issues. Only the perforated Rayblox HD® brand radiant barriers are versatile enough for all attic configurations illustrated. If you have any questions about which product would be best suited for your specific application, please feel free to call and speak with a trained sales representative.

Attic applications do not have R-values, but a U-value can be calculated depending on your level of existing insulation.

attic application with soffit and ridge vent
Rayblox HD® attic application with a soffit and ridge vent system. Install Rayblox HD® clear to ridge pole.
Insulation Choices
attic insulation choices
attic application with turbine or gable vent
Rayblox HD® attic application with a turbine or gable vent. A 3" gap along the ridge pole and at the base of the rafters (soffit) ensures enough air flow between Rayblox HD® and the roof deck. This applies to all vent systems other than soffit and ridge.
How is Heat Transferred?
heat transfer illustration


  • Carefully read over the Helpful Tips before starting.
  • Check the area you are insulating and make any needed repairs before installing Super R®.
  • Unroll the Rayblox HD® as you work, and cut it to suitable lengths with scissors or utility knife.
  • Allow for proper ventilation. See note below on ventilation.
  • Staple Rayblox HD® to the undersides of exposed rafters or between the rafters, if you have trusses.


Good ventilation in your attic increases your comfort and helps the materials of your house last longer. Be sure not to block ventilation paths when you install Rayblox HD®.