eShield vs. RadiantGUARD® - A Product Comparison
SUMMARY: eShield, while significantly more expensive than RadiantGUARD®, provides NO ADDITIONAL BENEFIT over RadiantGUARD at blocking radiant heat; the primary source of heat gain and loss in an attic space.
What is eShield?
eShield is a product that is marketed as a reflective insulation which claims to be superior to other products on the market. The product consists of an extremely thin layer of fiberglass insulation between two outer reflective aluminum layers. This fiberglass layer is what allows the product to be called a "reflective insulation," however if your goal is to block radiant heat from your attic (and almost ALL HEAT entering a home is radiant heat), all you truly needed is a radiant barrier.
eShield claims to block 97% of the radiant heat which is the standard amount blocked by most all radiant barriers on the market. It is the outer reflective aluminum layers of eShield that is doing all the work at blocking 97% of the radiant heat; not the thin fiberglass layer in the middle. The additional thin layer of fiberglass insulation in the middle of the eShield product DOES NOTHING to block any additional radiant heat.
The purpose of fiberglass insulation is merely to slow down the transfer of conductive heat and it takes several inches of fiberglass to provide any real benefit at slowing down this transfer of heat. Once a layer of fiberglass has absorbed its full capacity of heat, it then begins to transfer this heat out the opposite side. Because the fiberglass contained in eShield is less than 1/4 of an inch, the 3% of radiant heat that conducts through eShield is almost immediately transferred through and out the opposite side of the product as quickly as a radiant barrier WITHOUT this thin layer of fiberglass insulation rendering the fiberglass insulation found in eShield useless; just an unnecessary added material cost.
Direct Product Comparison - RadiantGUARD vs. eShield
|Class A / Class 1 fire rating under required E84 w/ E2599 fire testing||Yes||?|
|Perforated version available||Yes||?|
|DIY (Do It Yourself)||Yes||?|
|Fast ROI (Return on Investment)||Yes||?|
|Tensile Strength||96.4 lb/in width (cross direction)||?|
|Detailed Specifications online||Yes||No|