Radiant barrier attic11/26/2023 ![]() However, we see claims of up to R-14 for some bubble products. What about R-Value and Bubble/Fiberglass/Foam Insulation?īubble foil does offer some R-Value because of the bubbles (because remember, radiant barrier does not have an R-value on its own). Radiant barrier is your first line of defense (against radiant heat) and traditional attic insulation (fiberglass or cellulose) is the second line of defense against conductive heat gain. Traditional attic insulation and radiant barrier work together and each do their part. This is why you need BOTH types of insulation. Then, the heat transfer method switches from radiant heat to conductive heat to move through the attic insulation and into your home. The sun heats up the roof and then the heat is transferred by radiant heat across the attic space until it hits the attic insulation. Radiant barriers reflect radiant heat both conductive and radiant heat are trying to enter your home on a hot, summer day (or leave on a winter day when you are running the heat inside). ![]() Traditional attic insulation has R-value this works to slow conductive heat. This is important to understand because radiant barrier does not take the place of traditional insulation (fiberglass, cellulose, etc.). This might surprise you, but radiant barrier foil on its own has no R-Value! This is a great real-life example of why we don’t make coffee cups out of wood, Styrofoam keeps the heat in longer! Styrofoam or EPS (expanded Polystyrene) has an R-Value of 3.85 per inch therefore, three inches of Styrofoam will have an R-value of over 11. For example, wood has an R-Value of 1 for each inch of wood so three inches of wood has an R-Value of 3. Radiant heat is heat that passes through a gas or a vacuum, so this is the kind of heat the sun produces that radiates to earth until it is absorbed or reflected.Įvery product has a different R-Value. Conductive heat will only pass through a solid object (or several objects that are in contact with one another – like the layers of your roof on your home). ![]() This testing to designate an R-value only applies to conductive heat flow, not radiant heat flow. R-Value is a term to describe how quickly heat will pass through (or be absorbed) by a product. What is the R-Value (or R-Rating) of Radiant Barrier Foil Insulation? Radiant Heat Flooring – Over Conditioned Spaces.Radiant Heat Flooring – Over Non-Conditioned Spaces. ![]() Cathedral Ceilings – Hot/Mixed Climates. ![]()
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