What is the R-value of asphalt shingles?
0.44
Tables of Building Material R-values
| Material | Thickness | R-value (F° · sq.ft. · hr/Btu) |
|---|---|---|
| Asphalt Shingles | 0.44 | |
| Wood Shingles | 0.97 | |
| Glazing | ||
| Single Pane | 1/4″ | 0.91 |
What R-value do I need for my roof?
Depending on where you live and the part of your home you’re insulating (walls, crawlspace, attic, etc.), you’ll need a different R-Value. Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces.
Do roof shingles have an R-value?
The R values of both metal roofing and asphalt shingles are negligible, but this is not to be confused with energy efficiency. Both metal and asphalt roofs are most commonly directly exposed to the sun, and as a result both absorb and release heat.
What is the R-value of 60 TPO?
Weight – 0.36 lb. per square foot. Colors – White, tan, gray and dark gray. R-Value – 0.1 R (0.1 ft2ꞏ°Fꞏhr/Btu).
How does R-value work?
R-Values. An insulating material’s resistance to conductive heat flow is measured or rated in terms of its thermal resistance or R-value — the higher the R-value, the greater the insulating effectiveness. Installing more insulation in your home increases the R-value and the resistance to heat flow.
Does a metal roof increase R-value?
Technically, there is no difference in the insulation value of a metal or shingle roof. While metal roofs are efficient at its ability to resist heat transfer it is exposed and absorbs just as much heat as a shingle roof.
Is TPO a rubber roof?
TPO Roofing Systems It consists of different rubber types that are usually a combination of polypropylene and ethylene-propylene rubber. When being installed, TPO roofing systems are always welded, making the system extremely durable, but can also complicate installation because welding requires an electrical source.
What is the your value of gypsum board?
Gypsum board Insulating Value: 0.6 : Drywall. 1/2″ Gypsumboard = R 0.45 30. 5/8″ Gypsum board = R 0.56 30. See DRYWALL R-Values
What is the are value of concrete foundation?
8″ thick concrete slab or foundation wall has an R-value of about 1.04 30 while lightweight aggregate filled 8″ thick concrete has an R-value of about 2.18 30 Concrete-insulated 0.85 – 1.2
How is the are value of LTTR determined?
Definition: LTTR provides an R-value based on a fifteen-year weighted average thermal resistance, in order to take into account the observation that for some foam insulating materials the R-value diminishes over time, or by some calculations, an eight-year average R-value.
What causes a decrease in the are value of insulation?
Convection movements reducing R-values are more likely in wider dead air spaces and are virtually certain if there are leaks or penetrations at wall top and bottom. Note “Dead” air space; convection currents in cavities or along surfaces lose insulating value.