Measuring R Value (Resistance to Heat Flow) - KCBD NewsChannel 11 Lubbock

Measuring R Value (Resistance to Heat Flow)

Insulation R-value ratings can be misleading. Small voids in irregular framing and gaps within the wall cavity between fiberglass batt and framing of only 1 to 2% can lower the effective R-value by 25-40%.

Conventional R-value tests measure conduction, which is heat transfer between surfaces in direct contact. The cellular structure of Durafill is a poor conductor of heat, which gives rise to high R-values.

Radiation is the transfer of heat from one object to another by means of invisible infrared waves. People in a room at 72°F air temperature may feel cold if the walls are at 50°F. Conversely, they may feel uncomfortably warm if the walls are at 85°F, even though the air temperature is the same in both cases. Once again, the cellular structure of spray foam significantly reduces heat transfer by radiation effects.

Durafill insulation maintains its R-value of 3.52 per inch because it does not shrink, sag or settle over time. When properly installed, it adheres to a variety of substrates and fills gaps and cracks that lead to air and heat transfer.

HOW TO GET STARTED
Stand out from conventional homebuilders by adding Durafill open-cell spray polyurethane foam insulation to your construction project. Contact your Regional Representative for a list of recommended spray foam insulation contractors, building specifications, or additional product information.

Reduce Energy Consumption Through Air Control
Air moves in and out of a home through every hole, crack and seam. Approximately one third of air infiltrates through ceiling, walls and floor openings. The Department of Energy reports that heating and cooling (space conditioning) account for 40-60% of the energy used in the average American home.

Durafill open-cell insulation helps to maintain a comfortable indoor climate while using less energy. The application eliminates unwanted air and heat exchange and decreases the amount of moist air that leaks through the house, reducing the adverse effects of mold and mildew growth on or inside walls and ceilings.

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