R-Value
R-value measures how well an insulation material resists heat flow, with higher numbers indicating greater insulating performance.
What is R-Value?
R-value is a measurement of thermal resistance, showing how effectively a material slows the transfer of heat.
In general, the higher the R-value, the better the material performs as insulation.
Where R-Value Is Used
- Wall insulation
- Attic and roof insulation
- Floor and crawl space insulation
- Insulated doors and assemblies
Why R-Value Matters
Energy efficiency: Better insulation helps reduce heating and cooling costs.
Comfort: Proper R-values help stabilize indoor temperatures.
Code requirements: Minimum insulation levels often depend on local climate zone.
What Affects Real-World Performance
Installation Quality
Compressed, gapped, or poorly fitted insulation may not perform at its rated level.
Air Sealing
High R-value insulation still performs poorly if air leaks are left untreated.
Moisture Conditions
Wet insulation can lose effectiveness and lead to other building problems.
Common Mistakes
Focusing only on the number: Assembly design, air sealing, and moisture control matter too.
Using the wrong product for the location: Different assemblies call for different insulation strategies.
Ignoring code zones: Required R-values vary by region.
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