Introduction A reflective insulation typically performs as a system that incorporates one or more highly reflective (low emittance) surface(s) adjacent to an enclosed air space. Reflective insulations are typically installed on the outside of a duct using spacers to create an enclosed air space between the outer surface of the duct and the low emittance …
The effect of attic radiant barriers on the temperatures of roofing materials is the subject of a recently completed RIMA-I study. Dark roofing material (shingles) can absorb as much as 95% of incident solar radiation and, as a result, will increase in temperature above the surrounding air temperature. The temperature reached by a roof in …
The Reflective Insulation Manufacturers Association International (RIMA-I) recognizes and supports the ASTM standards for radiant barriers specifically ASTM C1313, ASTM C1158, and ASTM C168. Radiant barriers function by reducing heat transfer by radiation. The thermal performance or the reduction of radiant heat transfer is directly proportional to the surface emittance of the radiant barrier material. …
In both the United States and Canada there is significant interest in the use of reflective insulation materials in concrete floor systems. These materials typically have one or more aluminum foil surfaces and consist of flexible foam cores or cores with one or more layers of air filled bubbles (bubblepack). The most common concrete floor …
RIMA-I acknowledges the placement of a radiant barrier on top of mass insulation in attic spaces subject to the following conditions: 1. The mass insulation and ceiling building materials should be checked for any evidence of moisture accumulation. Any existing moisture problem should be corrected before installing the radiant barrier. 2. Radiant barriers used …