Field Testing Unvented Roofs with Asphalt Shingles in Cold and Hot-humid Climates
BSC TO5 Task 7.1 Field Testing Unvented Roofs with Asphalt Shingles in Cold Climates - Bolingbrook, IL 60440
BSC TO5 Task 7.1 Field Testing Unvented Roofs with Asphalt Shingles in Hot-Humid Climates - Friendswood, TX 77546
To understand the long-term moisture performance of unvented roof assemblies with fibrous insulation, the U.S. Department of Energy's Building America team Building Science Corporation built and monitored test roofs in two climates: a cold-climate test house in Bolingbrook, Illinois (Chicago area; zone 5A), and a hot-humid test house in Friendswood, Texas (Houston area, zone 2A). The Chicago-area test bed had seven parallel experimental rafter bays. The assemblies included a control vented compact (cathedral) roof, a dense-pack cellulose unvented roof, and an unvented roof with a "diffusion vent" (a strip of vapor-permeable gypsum sheathing at the ridge to allow drying). The interior finish was gypsum wallboard (GWB) with latex paint. The other four bays were top vent roof assemblies, which have a polypropylene breather mesh between the roof sheathing and the asphalt shingles to allow ventilation drying of the assembly from underneath the vapor-impermeable shingles. Two of the four "top vent" roofs were fiberglass batt and two were dense-pack cellulose roofs with either interior GWB or open to the interior. Wintertime moisture-related failure was accelerated by providing interior humidification (22.2 degree C [72 degree F]/50% relative humidity [RH]), which is known to be an extreme interior loading). Data were captured over 8 months, including a winter and the following spring and early summer.
Resources
3 resources available
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Field Testing Unvented Roofs with Asphalt Shingles in Cold and Hot-Humid Climates
PDF -
0000_Unvented_Chicago_Data.xlsm
XLSM -
Houston_Unvented_Data.xlsx
XLSX
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Complete Metadata
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| description | BSC TO5 Task 7.1 Field Testing Unvented Roofs with Asphalt Shingles in Cold Climates - Bolingbrook, IL 60440 BSC TO5 Task 7.1 Field Testing Unvented Roofs with Asphalt Shingles in Hot-Humid Climates - Friendswood, TX 77546 To understand the long-term moisture performance of unvented roof assemblies with fibrous insulation, the U.S. Department of Energy's Building America team Building Science Corporation built and monitored test roofs in two climates: a cold-climate test house in Bolingbrook, Illinois (Chicago area; zone 5A), and a hot-humid test house in Friendswood, Texas (Houston area, zone 2A). The Chicago-area test bed had seven parallel experimental rafter bays. The assemblies included a control vented compact (cathedral) roof, a dense-pack cellulose unvented roof, and an unvented roof with a "diffusion vent" (a strip of vapor-permeable gypsum sheathing at the ridge to allow drying). The interior finish was gypsum wallboard (GWB) with latex paint. The other four bays were top vent roof assemblies, which have a polypropylene breather mesh between the roof sheathing and the asphalt shingles to allow ventilation drying of the assembly from underneath the vapor-impermeable shingles. Two of the four "top vent" roofs were fiberglass batt and two were dense-pack cellulose roofs with either interior GWB or open to the interior. Wintertime moisture-related failure was accelerated by providing interior humidification (22.2 degree C [72 degree F]/50% relative humidity [RH]), which is known to be an extreme interior loading). Data were captured over 8 months, including a winter and the following spring and early summer. |
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| DOI | 10.25984/2204219 |
| identifier | https://data.openei.org/submissions/5512 |
| issued | 2016-04-27T06:00:00Z |
| keyword |
[
"ASHRAE 160",
"BuildingAmerica",
"asphalt shingles",
"building america",
"cellulose",
"cold",
"conditioned attic",
"cost effectiveness",
"existing home",
"hot humid",
"hvac",
"insulation",
"moisture monitoring",
"multifamily",
"new construction",
"residential",
"roof insulation",
"roof retrofit",
"single family",
"temperature",
"unvented attic"
]
|
| landingPage | https://data.openei.org/submissions/5512 |
| license | https://creativecommons.org/licenses/by/4.0/ |
| modified | 2023-11-01T16:39:43Z |
| programCode |
[
"019:000",
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| projectNumber | FY15 AOP 1.9.1.19 |
| projectTitle | Building Ameica |
| publisher |
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| title | Field Testing Unvented Roofs with Asphalt Shingles in Cold and Hot-humid Climates |
