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.

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.

We build a double-insulated roof system using both styrofoam and fiberglass insulation. This system has an R-Value of 42 +. We do the roof system up to, but not including, shingles.

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.

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.

Tile roofs are good insulators. The combined effect of the roof tiles, decking and the air space between the tiles allows for better air circulation and thereby reduces direct heat transfer. This results in lower air conditioning costs in the summer and decreases the formation of ice dams in the winter. BACK TO TOP

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

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

The roof itself consists of the roof trusses, roof purlins, metal building insulation, truss bracing, roof steel and screws. While the weight can vary greatly depending upon loading requirements, it will rarely be more than four pounds per square foot. With this said, most customers ask this question because they have concerns about unloading a truck. In most cases, our vendors will be equipped to offload materials they are delivering themselves.

Values are calculated using the equivalent thickness method as recommended by the National Concrete Masonry Association (NCMA).

Perhaps you've come across a scenario where you'll want a JSON string like "{'id':1}" transformed back to a Java class, but the catch is that the id property is not a simple value but another class (a complex value), say a wrapper around a primitive long. If you try to serialize such a string back to Java you'll get a ClassCastException.

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.