The picture below is an external view of a Rubb fabric building used in some recent infrared tests. It is a 70ft x 80ft x 16.4ft BVE type structure, used as a salt storage shed for the City of Sanford, ME. It was built in 2009 and has performed well for the public works department.
Thermal images were taken on a sunny spring day, where the sun was hitting the wall and roof at approximately the same angle. Results show that the reflective but translucent white roof is 12°f cooler than the sandstone-colored sidewalls.
The image below illustrates the results of the infrared surface temperature tests on the structure – a typical Rubb storage facility.
The outcome: a cool and comfortable indoor temperature while avoiding any need for lighting power consumption during a regular working day. These double energy savings help greatly reduce the Rubb structure’s operating costs.
Independent building science consultant Lew Harriman also notes: “We measured the air tightness of this building using a blower door. When its rolling overhead door is closed, it meets and exceeds the U.S. Army’s air tightness requirement to leak less than 0.25 cfm at a pressure difference of 75 Pascals (0.3” W.C). That means the building won’t have uncomfortable drafts, even in the highest winter winds. It also means its air tightness is better than half of the very air tight commercial buildings measured for ASHRAE’s recent research project RP-1478. When any building must be heated, that level of air tightness means big energy cost savings for every year of that building’s long life.”