Field Testing Unvented Roofs with Asphalt Shingles in Cold and Hot-humid Climates

Ueno, Kohta; Lstiburek, Joseph

doi:10.25984/2204219

Title: Field Testing Unvented Roofs with Asphalt Shingles in Cold and Hot-humid Climates

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Abstract

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 GWBmore »« less

Authors:

Ueno, Kohta; Lstiburek, Joseph

Building Science Corporation

Publication Date:: Wed Apr 27 00:00:00 EDT 2016

Other Number(s):: 5512

Research Org.:: DOE Open Energy Data Initiative (OEDI); Building Science Corporation

Sponsoring Org.:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Multiple Programs (EE)

Collaborations:: Building Science Corporation

Subject:: ASHRAE 160; Array; 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

OSTI Identifier:: 2204219

DOI:: https://doi.org/10.25984/2204219

Citation Formats


                    Ueno, Kohta, and Lstiburek, Joseph. Field Testing Unvented Roofs with Asphalt Shingles in Cold and Hot-humid Climates.  United States: N. p., 2016. 
        Web.  doi:10.25984/2204219.

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                    Ueno, Kohta, & Lstiburek, Joseph. Field Testing Unvented Roofs with Asphalt Shingles in Cold and Hot-humid Climates.  United States.  doi:https://doi.org/10.25984/2204219

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                    Ueno, Kohta, and Lstiburek, Joseph. 2016.  
"Field Testing Unvented Roofs with Asphalt Shingles in Cold and Hot-humid Climates".  United States.  doi:https://doi.org/10.25984/2204219.  https://www.osti.gov/servlets/purl/2204219. Pub date:Wed Apr 27 00:00:00 EDT 2016

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@article{osti_2204219,

  title        = {Field Testing Unvented Roofs with Asphalt Shingles in Cold and Hot-humid Climates},

  author       = {Ueno, Kohta and Lstiburek, Joseph},

  abstractNote = {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.},

  doi          = {10.25984/2204219},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {Wed Apr 27 00:00:00 EDT 2016},

  month        = {Wed Apr 27 00:00:00 EDT 2016}

}

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DOI: https://doi.org/10.25984/2204219

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Field Testing Unvented Roofs with Asphalt Shingles in Cold and Hot-Humid Climates

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