R Value. 4.1-5 (6) 9.1-10 (5) 3.1-4 (4) 7.1-8 (4) 2.1-3 (3) 10.1-15 (2) 15.1-20 (1) 5.1-6 (1) Sound Barrier. Yes (21) No (8) 48-inch x 96-inch x 1.5-inch Ship Lap

May 01, 2009 · Although the nominal R-value of polyiso is the highest of the three major types of rigid foam, its cold weather performance is lower: As the temperature drops, so does the R-value. Some builders working in cold climates give it an R-value of 4.5 or 5 per inch. Polyiso is not rated for ground contact. Mar 20, 2019 · This is an even more dense and more expensive foam board insulation. It provides an R-value of 6 per inch of thickness and often comes foil-faced to help reflect radiant heat. Polyiso comes in several thicknesses and is used over house sheathing underneath siding or in attic spaces where its reflective properties are very effective. Per-inch, R-value of softwood is 1.41. In hardwood, it is 0.71. Logs of around 6 inches would then have an R-value that is about 8. This value, when compared to other insulating materials, is actually pretty low; it is so low that it is below many industry standards. *R means resistance to heat flow. The higher the R-value, the greater the insulating power. R-value determined by ASTM C518. THERMAX™ Heavy Duty Insulation 1. pRoDucT nAME THERMAX™ Heavy Duty Insulation 2. MAnuf AcTuRER The Dow Chemical Company Dow Building Solutions 200 Larkin Midland, MI 48674 1-866-583-BLUE (2583) Fax 1-989-832-1465

## A medium-density batt offers R-13 for the same space. High-density batts for a 2 by 6 inch (51 by 152 mm) frame wall offer R-21, and high-density batts for an 8.5-inch (216-mm) spaces yield about an R-30 value. R-38 batts for 12-inch (304-mm) spaces are also available.

1- Per BSAF, 1#/cu.ft. eps has an r value of 3.85 AT 75 degrees F. Important for people living in the north, such as Minnesota, is that the r value at 0 degrees F is 4.55. The R Value goes up as the temperature drops. 2- The exact opposite is true for polyiso. Also it is much more expensive. [30] Divide this per inch numberby 2 to obtain the R-value for 1/2" medium density fiberboard = R 1.22. Fiberboard insulating sheathing, regular density, per inch: 2.64 30 : Questionable; [30] Divide this per inch number by 2 to obtain the R-value for 1/2" regular density fiberboard = R 1.32

### Loose cellulose, fibreglass (both blown and in batts), and rock wool (both blown and in batts) all possess an R-value of roughly R-2.5 to R-4 per inch. Straw bales perform at about R-1.5 per inch. However, typical straw bale houses have very thick walls and thus are well insulated. Snow is roughly R-1 per inch.

The R-value for wood ranges between 1.41 per inch (2.54 cm) for most softwoods and 0.71 for most hardwoods. Ignoring the benefits of the thermal mass, a 6-inch (15.24 cm) softwood log wall has a clear-wall (a wall without windows or doors) R-value of just over 8. Input depth of existing blown-in insulation (in inches). Click the button to calculate the approximate R-value for this job. This calculator is to be used as an estimating tool ONLY. R-values are additive. For instance if you have a material with an R-value of 12 attached to another material with an R-value of 3, then both materials combined have an R-value of 15. R-value Units. As we said before, the R-value measures the thermal resistance of a material. May 01, 2009 · Although the nominal R-value of polyiso is the highest of the three major types of rigid foam, its cold weather performance is lower: As the temperature drops, so does the R-value. Some builders working in cold climates give it an R-value of 4.5 or 5 per inch. Polyiso is not rated for ground contact.

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