Limited capacity for insulation
A building design may have limited capacity for insulation in some areas of the structure. A common construction design is based on stud walls, in which thermal bridges are common in wood or steel studs and joists, which are typically fastened with metal. Notable areas that most commonly lack sufficient insulation are the corners of buildings, and areas where insulation has been removed or displaced to make room for system infrastructure, such as electrical boxes (outlets and light switches), plumbing, fire alarm equipment, etc.
Eagle Shield Insulation – Shingle Temperature
One common misconception regarding radiant barrier is that the heat reflecting off the radiant barrier back out the roof has the potential to increase the roof temperature and possibly damage the shingles. This is simply not the case. Performance testing by Florida Solar Energy Center conclusively proved that the increase in temperature at the hottest part of the day was no more than about 5 degrees F. In fact, this study showed that radiant barrier had the potential to decrease the roof temperature once the sun went down because it was preventing the heat loss through the roof. RIMA International wrote a technical paper on the subject, where they collected statements from the largest roofing manufacturers, and none said that radiant barrier would in any way affect the warranty of the shingles(Garrett Harwood article)
Eagle Shield Industries terms and definitions:
Insulation composed principally of natural or synthetic elastomers, or both, processed to form a flexible, semi-rigid or rigid foam that has a closed-cell structure.
Insulation composed principally of polymerized styrene resin processed to form a rigid foam having a predominately closed-cell structure.
Capable of withstanding limited exposure to water. Garrett Harwood
Sum of the cold surface temperature and the hot surface temperature divided by two. (Thermal conductivity charts are calculated to use mean temperatures).