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1 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Moisture Barriers WEATHERIZATION INSTALLER/TECHNICIAN FUNDAMENTALS.

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Presentation on theme: "1 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Moisture Barriers WEATHERIZATION INSTALLER/TECHNICIAN FUNDAMENTALS."— Presentation transcript:

1 1 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Moisture Barriers WEATHERIZATION INSTALLER/TECHNICIAN FUNDAMENTALS WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012

2 2 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov By attending this session, participants will be able to: Identify symptoms of moisture problems in houses. Name sources of moisture. State moisture terms and concepts. List moisture tools and their functions. Demonstrate moisture barrier installation. Describe roof repair techniques. (Continued on next slide) Learning Objectives MOISTURE BARRIERS

3 3 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov By attending this session, participants will be able to: Identify flashing locations. State basement and crawl space retrofit options as related to moisture issues. Identify techniques for basement and crawl space retrofits. Demonstrate moisture assessment logic, and list various moisture control strategies. Learning Objectives MOISTURE BARRIERS

4 4 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Symptom #1 Excessive window condensation Photo courtesy of PA WTC MOISTURE BARRIERS

5 5 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Symptom #2 Frost on underside of roof sheathing MOISTURE BARRIERS Photo courtesy of PA WTC

6 6 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Foundations Unvented space heaters Unvented dryers Disconnected ventilation fans Drying wood indoors Excessive mechanical or passive humidification Moisture Sources These water stains are a result of fan venting into the attic. MOISTURE BARRIERS Photo courtesy of PA WTC

7 7 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Sources of Water Vapor MOISTURE BARRIERS

8 8 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Condensation: Water vapor transformed to liquid water. Evaporation: Liquid water transformed to water vapor. Absolute Humidity (vapor pressure): The ratio of water vapor to a given volume of air. Relative Humidity (RH): The ratio of the amount of moisture in the air compared to amount of moisture that the air can hold. Dew Point: The temperature at which condensation occurs. Important Terms and Concepts MOISTURE BARRIERS

9 9 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Warm, wet air contacting cold surfaces creates condensation instantly. Cold winter air typically contains very little moisture and therefore has a low RH. When that air is heated, the RH drops even lower. RH below 15% can lead to respiratory problems, failure of furniture glue, and other problems. RH: Things to Remember MOISTURE BARRIERS

10 10 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov MOISTURE BARRIERS Moisture Meters Photos courtesy of PA WTC

11 11 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Roof Flashing Locations MOISTURE BARRIERS Photo courtesy of www.stewartroofing.com Valleys and roof edges are important locations for proper flashing.

12 12 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Cut hole to fit; test fit vent. Caulk edges of hole where flange will sit. Slide vent into place under shingles. Seal and nail. Vent Installation MOISTURE BARRIERS Photo courtesy of the US Department of Energy

13 13 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Stepped flashing, combined with effective over- flashing, protects the chimney penetration from moisture intrusion. Chimney Flashing MOISTURE BARRIERS Photo courtesy of www.stewartroofing.com.

14 14 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Bend the roof flap down and overlap the seams with a precut piece of galvanized metal roofing. Back-caulk the patch with high-temperature silicone caulk, and attach with hex head screws set every 2 inches. Mobile Home Roof Repair #1 Photos courtesy of PA WTC MOISTURE BARRIERS

15 15 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Cover with two coats of elastomeric roof coating over fiberglass mesh Mobile Home Roof Repair #2 Photos courtesy of PA WTC MOISTURE BARRIERS

16 16 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Visual Assessment – Exterior Water Mismanagement Basement moisture problems may be traced back to poor exterior drainage. Driveway slopes back into foundation, carrying moisture there. A disconnected downspout causes water to pour down walls during weather events. Photos courtesy of PA Weatherization Training Center MOISTURE BARRIERS

17 17 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov  Standing water is often caused by poor exterior or interior drainage.  Many homes don’t have sump systems; many homes have sump systems that don’t work.  Condensation on cool surfaces during warm, humid periods can cause moisture problems.  Saturated building and cellulose- based materials lead to mold problems.  Resolve all major moisture issues before weatherizing a home. Foundation Moisture Issues What’s the difference between a basement and a pond? Sometimes very little. MOISTURE BARRIERS Foundation spaces account for the vast majority of moisture and indoor air quality (IAQ) issues in houses. Photo courtesy of the US Department of Energy

18 18 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Photo courtesy of PA WTC

19 19 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Symptoms Wet wood Condensation on foundation surfaces Possible Reasons High ground moisture source Warm humid air entering vents from outside Crawl space surfaces are below the dew point or mold threshold of the outside air Crawl Space Condensation Water droplets of condensation on AC ducts MOISTURE BARRIERS Photo courtesy of PA WTC

20 20 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Control Strategies Install a ground vapor retarder. Control moisture sources and remove susceptible materials. Consider converting to a conditioned crawl space. MOISTURE BARRIERS

21 21 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Photo courtesy of INCAP

22 22 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Basements and Crawlspaces Photo courtesy of INCAP

23 23 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Attic Case Study #1 Floored Attic and First Condensing Surface MOISTURE BARRIERS Photo courtesy of PA WTC

24 24 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Symptoms Condensation or mold growth on attic surfaces (rafters, sheathing or underside of flooring) Possible Reasons Moderate to high interior moisture source Attic surface temps are below the dew point of the indoor air Air leaks to attic Control Strategies Source control Air seal the attic Attic Case Study #2 MOISTURE BARRIERS

25 25 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Crawl Space Case Study #1 MOISTURE BARRIERS Photo courtesy of PA WTC Water Droplets of Condensation on A/C Ducts

26 26 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Symptoms Wet wood Condensation on foundation surfaces Possible Reasons High ground moisture source Warm humid air entering vents from outside Crawl space surfaces are below the dew point of the outside air Crawl Space Case Study #2 Conditioned crawlspace with air sealed and insulated walls MOISTURE BARRIERS Photo courtesy of INCAP Control Strategies Install a ground vapor retarder. Control moisture sources and remove susceptible materials. Consider converting to a conditioned crawl space.

27 27 | WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM – July 2012eere.energy.gov Identifying the source of moisture should inform moisture solutions. Understanding the effects of temperature and vapor pressure on RH can help identify solutions. Source control, air sealing, ventilation, and thermal improvements are important moisture mitigation strategies. Photos and diagnostic equipment help document existing conditions. Follow proper installation guidelines for moisture barriers and roof repair. Summary MOISTURE BARRIERS

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