What Is Radiant Barrier?
Radiant barrier insulation is a reflective insulation system that offers a
permanent way to reduce energy costs. Radiant barrier insulation systems reflect
radiant heat energy instead of trying to absorb it. A pure aluminumized film
radiant barrier reflective insulation is unaffected by humidity and will
continue to perform at a consistent level no matter how humid it may be. A
radiant barrier insulation system is a layer of metalized film facing an
airspace and is installed in the envelope of a building.
Most people are familiar with traditional insulating materials such as
fiberglass, cellulose, Styrofoam, and rock wool. These products use their
ability to absorb or resist (slow down) convective and conductive heat transfer
to insulate (R-value). A third, seldom discussed but dominant form of heat
transfer exists: radiant heat
transfer. What are the
differences among the three forms of heat transfer?
contact. If you touch a pot on the stove, this is conductive heat transfer.
moisture. If you put your hand above a boiling pot, you will feel heat in the
form of steam. This is convective heat transfer.
Step outside on a sunny day and feel the sun’s rays on your face. You are
feeling radiant heat transfer. All objects above absolute zero (-459.7 degrees
F.) emit infrared rays in a straight line in all directions.
A radiant barrier reflects radiant
heat energy instead of trying to absorb it. What does this mean in your home or
business? During the winter, 50-75% of heat loss through the ceiling/roofing
system and 65-80% of heat loss through walls is radiant. In the summer, up
to 93% of heat gain is radiant. If
you are depending on R-value (resistance) alone to insulate against heat gain
and loss, remember that thin layers of fiberglass are virtually transparent to
radiant energy and are affected by changes in humidity (moisture levels). A
1-1/2% change in the moisture content of fiberglass insulation will result in a 36%
decrease in performance
(referenced from HVAC Manual 10.6; McGraw-Hill). A pure aluminumized film
radiant barrier is unaffected by humidity and will continue to perform at a
consistent level no matter how humid it may be.
Testing and Approvals
- Building Officials and Code Administrators
- International Conference of Building
- Southern Building Code Congress
- Metropolitan Dade County (FL) Building Code
- United States Testing Company
- Tennessee Valley Authority
- Tennessee Technological University
- State of California
- Oak Ridge National Laboratory
- Texas A & M University
- Computer Internet Services- customer
testimonials available upon request