Question 1

What is the R-value of 2-lb closed-cell spray foam insulation?

Accepted Answer

The R-value of 2-lb closed-cell spray foam insulation typically ranges from R-6 to R-7 per inch. This high R-value makes it an efficient choice for insulating areas where maximizing energy efficiency is a priority.

Question 2

How does the R-value of 2-lb spray foam compare to other insulation types?

Accepted Answer

Compared to other types of insulation, 2-lb spray foam offers one of the highest R-values per inch, outperforming materials like fiberglass (R-3 to R-4 per inch) and cellulose (around R-3.5 per inch). This makes spray foam a more space-efficient choice for achieving high insulation performance.

Question 3

What is LTTR (Long-Term Thermal Resistance) in spray foam insulation, and why is it important?

Accepted Answer

LTTR (Long-Term Thermal Resistance) measures how insulation performs over time, rather than immediately after installation. This is essential for spray foam, as the R-value may decrease slightly as the blowing agent escapes. Knowing the LTTR helps you understand the long-term effectiveness of your insulation.

Question 4

Why does the R-value of spray foam insulation diminish over time?

Accepted Answer

The R-value of spray foam insulation may decrease as a fraction of the blowing agent within its closed cells escapes and is replaced by air. This process is natural and gradual, impacting the insulation's R-value over the long term. Modern spray foams now use HFO blowing agents instead of HFCs, which are better for the environment.

Question 5

Is 2-lb closed-cell spray foam insulation environmentally friendly?

Accepted Answer

Yes, modern 2-lb closed-cell spray foam insulation uses hydrofluoroolefin (HFO) blowing agents, which have a significantly lower global warming impact than the previously used HFCs. This makes it a more environmentally friendly insulation option.

Question 6

Can 2-lb spray foam insulation be used as a vapor barrier?

Accepted Answer

Yes, when applied at a thickness of 2 inches or more, 2-lb closed-cell spray foam serves as both an insulator and a vapor barrier. This dual functionality meets insulation and moisture protection requirements in areas like basements, helping to qualify for certain rebates.

Question 7

What are the recommended R-values for different areas of my home in Manitoba to meet insulation standards?

Accepted Answer

Efficiency Manitoba provides specific recommended R-values for different areas to qualify for energy rebates and ensure optimal insulation performance: - Attics: R-50 or higher - Basement Walls: Minimum of R-24 - Exterior Above-Grade Walls: Minimum of R-20 - Floors over Unheated Spaces: R-28 - Crawl Space Walls: Minimum of R-24 2-lb closed-cell spray foam can help you reach these R-values efficiently, especially in attics, walls, and crawl spaces, due to its high R-value per inch.

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