Many architects are now specifying doors with the ASTM C1363 test as the standard for thermal transmittance. In fact, the doors are performing the same as before – it is just that the R-values are much more in line with how the door really performs. The results of ASTM C1363 are much lower, but are much more accurate to the actual installed conditions. So a new standard test has been implemented, ASTM C1363, which tests the entire door assembly including the frame and hardware. However, we all know that the frame, gasketing, and, hardware will significantly affect the thermal transmittance. This is a huge difference and essentially comes down to ASTM C518 being a theoretical maximum based on a steady-state thermal test of only a portion of the door panel. This means that the walls can be economical despite the use of high-quality materials. ICFs are simple to assemble and they consolidate several construction steps into one. Based on ASTM C518 (Calculation Method) the door has an R-value of up to 11, but using ASTM C1363 (Tested/Operable) the same door only have an R-value of up to 3.5. The many benefits of a concrete house built with insulating concrete forms (ICFs) are available for only slightly more than the cost of traditional wood-frame construction. In the chart above, you will notice that there are two vastly different R-values provided for insulated metal doors with polyurethane insulation. Archtoolbox does not test materials or assemblies. The values in the table above were taken from a number of sources including: the ASHRAE Handbook of Fundamentals,, and Building Construction Illustrated by Francis D.K. Solid insulated metal door, polyurethane insulation Solid insulated metal door, polystyrene insulation Vermiculite (WARNING: may contain asbestos)Īluminum / Vinyl Siding (1/2' insulation) R-19 Mineral Fiber with 2圆 wood studs 24' OC R-19 Mineral Fiber with 2圆 metal studs 24' OC

R-19 Mineral Fiber with 2圆 metal studs 16' OC R-11 Mineral Fiber with 2x4 metal studs 24' OC R-11 Mineral Fiber with 2x4 wood studs 16' OC R-11 Mineral Fiber with 2x4 metal studs 16' OC Consult manufacturer literature for values specific to your project. For instance, using argon gas in a double pane insulating glass unit will dramatically improve the R-value. Insulating concrete forms, or ICFs, are forms used to hold fresh concrete that remain in place permanently to provide insulation for the structure they enclose. The R-values for specific assemblies like doors and glazing in the table below are generalizations because they can vary significantly based on special materials that the manufacturer uses. U Factor Equation Tables of Building Material R-values A complete lime plaster system built to preserve hemp block wall architecture.

Insulating concrete blocks