Author: Gerald E. Sherwood
Publisher:
ISBN:
Category : Condensation
Languages : en
Pages : 24
Book Description
Condensation Potential in High Thermal Performance Walls -- Cold Winter Climate
Condensation Potential in High Thermal Performance Walls
Author: Gerald E. Sherwood
Publisher:
ISBN:
Category : Dampness in buildings
Languages : en
Pages : 19
Book Description
As a result of steadily rising energy costs, construction practice for light-frame wood structure has changed over the past few years. The use of 6-inch-thick walls and application of high-'R'-value, low-permeance sheathings to 4-inch walls has caused concern for the changing moisture patterns that may occur in walls. To observe actual moisture patterns and the potential for condensation, a test structure was constructed near Madison, Wis., for exposure of eight types of insulated wall panels at controlled indoor conditions and typical outdoor weather conditions. Panels were instrumented with moisture sensors and tested without (Phase 1) and with (Phase 2) penetrations (electrical outlets) in the indoor surface. Continuous vapor retarders effectively prevented condensation; asphalted paper stapled between studs was inadequate. The installation of an electrical outlet changed the moisture profile and resulted in some condensation in most panels. Moisture levels on the back of siding in most Phase 2 panels have been known to produce buckling in long sections of hardboard siding. Although streaking occurred on the siding of two types of Phase 1 panels and three Phase 2 types, and some condensation occurred in all types of Phase 2 panels, there was no long-term accumulation of free water in the structure. The moisture content of framing remained below 12 percent throughout the 2-year study. There was no apparent increase in condensation potential with the addition of low-permeance foam sheathing in this study with controlled indoor conditions.
Publisher:
ISBN:
Category : Dampness in buildings
Languages : en
Pages : 19
Book Description
As a result of steadily rising energy costs, construction practice for light-frame wood structure has changed over the past few years. The use of 6-inch-thick walls and application of high-'R'-value, low-permeance sheathings to 4-inch walls has caused concern for the changing moisture patterns that may occur in walls. To observe actual moisture patterns and the potential for condensation, a test structure was constructed near Madison, Wis., for exposure of eight types of insulated wall panels at controlled indoor conditions and typical outdoor weather conditions. Panels were instrumented with moisture sensors and tested without (Phase 1) and with (Phase 2) penetrations (electrical outlets) in the indoor surface. Continuous vapor retarders effectively prevented condensation; asphalted paper stapled between studs was inadequate. The installation of an electrical outlet changed the moisture profile and resulted in some condensation in most panels. Moisture levels on the back of siding in most Phase 2 panels have been known to produce buckling in long sections of hardboard siding. Although streaking occurred on the siding of two types of Phase 1 panels and three Phase 2 types, and some condensation occurred in all types of Phase 2 panels, there was no long-term accumulation of free water in the structure. The moisture content of framing remained below 12 percent throughout the 2-year study. There was no apparent increase in condensation potential with the addition of low-permeance foam sheathing in this study with controlled indoor conditions.
Condensation Potential in High Thermal Performance Walls
Author: Gerald E. Sherwood
Publisher:
ISBN:
Category : Condensation
Languages : en
Pages : 32
Book Description
Publisher:
ISBN:
Category : Condensation
Languages : en
Pages : 32
Book Description
Condensation Potential in High Thermal Performance Walls
Author: Gerald E. Sherwood
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
Book Description
To observe actual moisture patterns and the potential for condensation due to long periods of air conditioning in a hot, humid climate, a test structure was constructed near Gulfport, Mississippi, for exposure of eight types of insulated wall panels at controlled indoor conditions and typical outdoor weather conditions. Panels were instrumented with moisture sensors and tested without (Phase 1) and with (Phase 2) penetrations (electrical outlets) in the indoor surface. There was no sustained condensation in any of the walls during either winter season. One type of high thermal performance wall had sustained condensation during both summers, but the wall dried out as the weather became cooler, and moisture content of framing never exceeded 17 percent. Low-permeance sheathing appeared to provide resistance to the buildup of moisture during summer in walls with high overall 'R' values. Penetrating the walls with electrical outlets resulted in slightly higher moisture levels in all of the walls throughout the year. This paper should be useful to building designers, builders, and building code officials in establishing vapor retarder requirements for walls. Keywords: Condensation, moisture control, vapor retarder, air leakage, wood-frame walls, foam sheathing.
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
Book Description
To observe actual moisture patterns and the potential for condensation due to long periods of air conditioning in a hot, humid climate, a test structure was constructed near Gulfport, Mississippi, for exposure of eight types of insulated wall panels at controlled indoor conditions and typical outdoor weather conditions. Panels were instrumented with moisture sensors and tested without (Phase 1) and with (Phase 2) penetrations (electrical outlets) in the indoor surface. There was no sustained condensation in any of the walls during either winter season. One type of high thermal performance wall had sustained condensation during both summers, but the wall dried out as the weather became cooler, and moisture content of framing never exceeded 17 percent. Low-permeance sheathing appeared to provide resistance to the buildup of moisture during summer in walls with high overall 'R' values. Penetrating the walls with electrical outlets resulted in slightly higher moisture levels in all of the walls throughout the year. This paper should be useful to building designers, builders, and building code officials in establishing vapor retarder requirements for walls. Keywords: Condensation, moisture control, vapor retarder, air leakage, wood-frame walls, foam sheathing.
Monthly Catalogue, United States Public Documents
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1358
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1358
Book Description
Monthly Catalog of United States Government Publications
Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages :
Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages :
Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Buildings Energy Conservation
Author:
Publisher:
ISBN:
Category : Architecture and energy conservation
Languages : en
Pages : 18
Book Description
Publisher:
ISBN:
Category : Architecture and energy conservation
Languages : en
Pages : 18
Book Description
Research Paper FPL
Author:
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 642
Book Description
Publisher:
ISBN:
Category : Forest products
Languages : en
Pages : 642
Book Description
Reliability Analysis of Fire-exposed Light-frame Wood Floor Assemblies
Author: Frank E. Woeste
Publisher:
ISBN:
Category : Fire testing
Languages : en
Pages : 868
Book Description
Publisher:
ISBN:
Category : Fire testing
Languages : en
Pages : 868
Book Description
Thermal Performance of the Exterior Envelopes of Buildings III
Author: American Society of Heating, Refrigerating and Air-Conditioning Engineers
Publisher: American Society of Heating Refrigerating and Air-Conditioning Engineers
ISBN:
Category : Buildings
Languages : en
Pages : 1512
Book Description
Publisher: American Society of Heating Refrigerating and Air-Conditioning Engineers
ISBN:
Category : Buildings
Languages : en
Pages : 1512
Book Description