Attic Insulation R Value: How To Choose the Right Insulation

Written by

Dumitru Nicolaescu

Updated:

September 13, 2024

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Understanding Insulation R Value

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Determine the thickness of the insulation in inches. This is usually listed on the insulation packaging or can be measured with a ruler or tape measure.
Determine the thermal conductivity of the insulation in BTU/(hrft^2°F). This information can also be found on the insulation packaging or by doing some research online.
Divide the thickness of the insulation by the thermal conductivity to get the R value.

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Moisture: Moisture can significantly reduce the R-value of insulation, as wet insulation conducts heat more easily than dry insulation. It's important to ensure that insulation is properly installed and protected from moisture to ensure accurate R-value calculations and optimal thermal performance.
Air Leaks: Air leaks can also impact R-value, as they allow heat to escape or enter a building more easily. It's important to properly seal any air leaks before installing insulation to ensure accurate R-value calculations and optimal thermal performance.
Compression: Insulation that is compressed or not installed properly can have a reduced R-value, as the insulation is not able to effectively resist heat transfer. It's important to ensure that insulation is installed correctly and not compressed to ensure accurate R-value calculations and optimal thermal performance.
Age and Degradation: Over time, insulation can degrade and lose its effectiveness, which can impact the R-value. It's important to regularly inspect insulation and replace any that has deteriorated or lost its effectiveness to ensure accurate R-value calculations and optimal thermal performance.

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Material: There are many different types of insulation available, each with its own advantages and disadvantages. Common insulation materials include fiberglass, spray foam, cellulose, and mineral wool. Consider the material's cost, R-value, resistance to moisture, air leaks, and fire, as well as any potential health or environmental concerns.
Location: Different areas of a building may require different types or thicknesses of insulation. For example, walls and attics may require different insulation than floors or basements. Consider the specific location and its unique insulation needs when selecting insulation.
Climate: The climate in your area can also impact the type and thickness of insulation needed. Colder climates may require insulation with a higher R-value to maintain comfortable indoor temperatures, while warmer climates may require insulation with a lower R-value.
Cost: Cost is also an important factor to consider when selecting insulation. While higher R-value insulation may be more effective, it may also be more expensive. Consider your budget and the potential long-term energy savings when selecting insulation.

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