what it is and how it works

What is radiant barrier?

In essence, WareHouseFoil™ radiant barrier is like a shade for your warehouse that reflects the infrared energy (heat) emitting from the sun away from the building. You probably already have some form of radiant barrier at work in your home. For example, do you have shiny silver flex ducts in your attic? These are insulated tubes with a radiant barrier covering. The radiant barrier reduces heat from entering the duct work and effectively makes the R-Value of the insulation greater. Conceptually, this is what we are trying to achieve for your building. We developed this product as a low cost solution to reduce radiant heat flow through roofs and external walls. Simply put, installing WareHouseFoil™ INSIDE your building will feel similar to instantly putting a tree OUTSIDE your building.

How Radiant Barrier Works in Your Building

What makes radiant barrier foil so effective in cooling off a hot warehouse or garage? Our radiant barriers work by blocking 97% of radiant heat from being absorbed into garages, barns, warehouses, etc. resulting in a more comfortable and energy efficient space.
An example of this is if you hold a hot brick a few inches away from your face. You can FEEL the radiant heat coming from the brick. If you were to PRESS the brick against your skin, you would no longer have radiant heat, you would have CONDUCTIVE heat since the two objects (the brick and your skin) are in direct contact. Radiant heat is part of the light spectrum and the wave (heat) from the hot object will travel at the speed of light until it is either absorbed or reflected. A radiant barrier is a HIGHLY REFLECTIVE sheet of pure polished aluminum foil that is laminated to a heavyweight no-tear internal woven scrim. Basically, it’s like a heavyweight, no-tear blue tarp, except with aluminum attached, that will reflect over 97% of the radiant heat.


When you get a WareHouseFoil™ between you and the hot roof, the HIGHLY REFLECTIVE surface of the radiant barrier foil will REFLECT the heat back towards the roof and keep you, and everything inside your building cooler.


Radiant Heat vs. Conductive Heat

Radiant heat is heat transferred through air/space and conductive heat transfer is heat transferred through materials/objects that are in direct contact (ie. touching) one another. Both types of heat exist in a warehouse or metal building.


The key to comfort is to eliminate as much heat as possible right near the source, in most cases that is the roof line (in other cases that could be the walls or the garage doors). Using a radiant barrier as the first line of defense is most effective in controlling heat gain because radiant barriers actually REFLECT HEAT. This has the biggest impact on how the space feels because 97% of the heat is never making it past the WareHouseFoil™ layer.


Conductive heat is slowed by traditional insulation with R-value. R-value is simply a measure of how well an item (or material) slows down heat gain. In a non-conditioned building, radiant barrier is really all you need to block the heat from entering or escaping.


WareHouseFoil™ Compared to Bubble Foil & Other Products

The most common question we hear is: How does WareHouseFoil™ radiant barrier compare to other products like eShield, SolarGuard, Prodex, Ultra Power Shield, Green Energy Barrier, Enerflex Radiant Barrier, Reflectix Bubble Foil Insulation, etc.? Find out the answer to this popular question here.


Read Our Full Article on How Does WareHouseFoil® compare to eShield, Prodex, Bubble Foil, etc?


Other Common Questions

Is WareHouseFoil™ fire-rated? What is the thickness? Is it permeable? How heavy is it? Answers to all of these questions and more can be found here.


Does radiant barrier paint really work? Is it as good as foil? Learn about the comparison of radiant barrier foil to reflective paint and find out which product delivers the best results.


Can I really save 50% on my electric bill? Can I buy this at Home Depot or Lowes? Will this foil affect my cell reception?  Find answers to these questions and many more in our FAQ section.