R-value is an assigned number derived from a specific testing procedure to determine a materials (or building assemblage) "resistance to conductive heat transfer". The higher the R-value, the more resistant a material (or building assemblage) is to conductive heat transfer.

That's a good question, but unfortunately the answer is not so simple, Window thermal performance is measured as a U-Value which Is the reciprocal of the R-Value ( R-Value = 1/U-Value. For example. R 2 = U .50, or 1/.50 = 2) A bit of background: the R-Value measures the resistance to heat loss or gain, while the U-Value measures the transmittance of heat through a material. The higher the number in R-Value the better the resistance, so the better the insulating value. See similar questions...

No. Products with R-values reduce rates of "conductive" heat transfer and are tested for this characteristic. Radiant Barriers provide benefit by dramatically reducing "radiant" heat transfer which is just as quantifiable but not related to R-value type performance. See similar questions...

No. Our products do not operate in this manner. Minimal benefit is netted when the product is doubled. See similar questions...

This is a measurement of heat resistance (the higher the number, the better). R value = the number 1 divided by the U value. See similar questions...

R Value - the measurement of 'insulating ability' of the material. The higher the R Factor number the greater the insulation value. U Value - the measurement of 'heat loss' through the material. The lower the U Value the less heat is escaping. See similar questions...

Every component of the roof (i.e.: GI sheet, concrete, insulation, air space, sheetrock/gypsum, acoustical tiles, etc.) has a given R-value based on its thickness. Basic HVAC data reference books will provide the R-value or the K-value for most construction materials. If you do not have any reference books, we will be happy to tell you the R-value of materials you are considering. See similar questions...

A NRG Block is six to ten times higher in R-Value than a common block, which ranges from 1.5 to 2.5 depending upon the aggregate used. See similar questions...

Other blocks using inserts or hollow core blocks with poured insulation range between 5 and 6 for a 9 and 10" block. See similar questions...

The 4½" inch thick SIP has a rating of R-20. However, it is important to note that SIPs are much more efficient than conventional types of insulation with the same R-Value. A home built with SIPs will use about 25% less energy than a typical stick-framed house. The solid, air-tight construction of these panels is what gives them their superior thermal performance. See similar questions...

The "R" value depends on the number and size of the airspaces surrounding the RB and on the direction of the heat flow. Since RB is usually installed on top of existing mass insulation, its R-value is a moot point. It is RB's ability to reflect heat that makes it such an energy saver. See similar questions...

The standard form has an R-22 equivalent and the variable forms an R-24 equivalent. Equivalent R-values are the measurements commonly used to convert to stud-and-batt construction standards. See similar questions...