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The wood elements that comprise conventional framing (studs, plates, posts, headers, and blocking for openings) fill an average of 25% or more of the wall cavity framed 16” o.c. (Source California Department of Energy Title 24 Standards). While the wood members provide strength, they also displace the insulation and thermally bridge the wall, undermining the rated R-value of a wall.
The cost to heat or cool buildings is significantly impacted by the air leakage of the building envelopment. Traditionally, this performance measurement gets far less focus than isolated thermal resistance. To examine the air leakage performance, BamCore had the exterior Prime Wall and a comparable 2×6 conventionally framed wall tested at two levels of air pressure at an ISO accredited independent lab. Without the addition of any exterior wall wrap material, in low-pressure testing that represents calm wind and weather conditions, the Prime Wall had a 67% reduction in air leakage compared to the conventionally framed 2×6 wall. However, even more significant, was the Prime Wall’s 83% reduction in air leakage compared to the conventional wall, when tested at a higher level of air pressure that represents stormy wind and weather conditions.
Exterior Sound Sources. Outside sound pollution includes relatively low-frequency sounds that come mostly from cars, trucks, equipment, and planes. The prevalence of these lower frequencies sounds is weighted more heavily in the OITC rating. The standard BamCore exterior Prime Wall (without any finish siding) enjoys an OITC rating of 42, which compares to a conventional 2×6 stud wall of only 32. Because sound loudness is measured on a logarithmic scale and not on an arithmetic scale, this 10-point difference is quite significant and easily perceived. To improve the sound attenuation of a conventional stud wall, expensive and complicated materials and techniques must be added, like double framing with staggered stud placement or difficult to install resilient channels or c-clips between the studs and the gypsum.
The cost to heat or cool buildings is significantly impacted by the air leakage of the building envelopment. Traditionally, this performance measurement gets far less focus than isolated thermal resistance. To examine the air leakage performance, BamCore had the exterior Prime Wall and a comparable 2×6 conventionally framed wall tested at two levels of air pressure at an ISO accredited independent lab. Without the addition of any exterior wall wrap material, in low-pressure testing that represents calm wind and weather conditions, the Prime Wall had a 67% reduction in air leakage compared to the conventionally framed 2×6 wall. However, even more significant, was the Prime Wall’s 83% reduction in air leakage compared to the conventional wall, when tested at a higher level of air pressure that represents stormy wind and weather conditions.
The wood elements that comprise conventional framing (studs, plates, posts, headers, and blocking for openings) fill an average of 25% or more of the wall cavity framed 16” o.c. (Source California Department of Energy Title 24 Standards). While the wood members provide strength, they also displace the insulation and thermally bridge the wall, undermining the rated R-value of a wall.
The cost to heat or cool buildings is significantly impacted by the air leakage of the building envelopment. Traditionally, this performance measurement gets far less focus than isolated thermal resistance. To examine the air leakage performance, BamCore had the exterior Prime Wall and a comparable 2×6 conventionally framed wall tested at two levels of air pressure at an ISO accredited independent lab. Without the addition of any exterior wall wrap material, in low-pressure testing that represents calm wind and weather conditions, the Prime Wall had a 67% reduction in air leakage compared to the conventionally framed 2×6 wall. However, even more significant, was the Prime Wall’s 83% reduction in air leakage compared to the conventional wall, when tested at a higher level of air pressure that represents stormy wind and weather conditions.
