FIELD STUDY AND ANALYTICAL ASSESSMENT OF SEALED ATTICS

FIELD STUDY AND ANALYTICAL ASSESSMENT OF SEALED ATTICS

FIELD STUDY AND ANALYTICAL ASSESSMENT OF SEALED ATTICS CONDUCTED FOR THE STATE OF FLORIDA David O. Prevatt, PhD, P.E. Associate Professor University of Florida, Gainesville, FL William Miller, Ph.D., P.E. Research Scientist Oak Ridge National Laboratory Joint Faculty at the University of Tennessee Mechanical Engineering Architecture and Design Tallahassee, FL

32399-2100 24February 2016 Project Team Motivation Purpose & Goals Scope of Work

Milestones and Deliverables Field Instrumentation SPONSOR: SCHOOL OF SUSTAINABLE INFRASTRUCTURE & F LOR IDA B UI LDI N G COM MI SSI ON F I E L D S T U DY A N D A N A LY T I C A L A S S E S S M E N T O F S E A L E D ATT I C S C O N D U C T E D F O R T H E S TAT E O F F LO R I DA TOPICS COVERED

PROJECT TEAM University of Florida Dr. David O. Prevatt Associate Professor Dept. of Civil and Coastal Engineering Oak Ridge National Laboratory (Subcontract): - Dr. WA Miller, Building Envelope Program - Dr. S. Pallin - P. Boudreaux - Dr. R. Jackson - A. Desjarlais 3 MOTIVATION ORNL Observed Peaks in RH in Sealed Attics

Visual Evidence of Moisture Storage in ocSPF 4 THE EFFECT OF SEALED/UNVENTED ATTICS ON INDOOR COMFORT AND ROOF ASSEMBLY DURABILITY 5 PURPOSE & GOAL PURPOSE To monitor relative humidity, temperature and moisture content of sheathing in two residential structures having sealed attic systems.

To document the air tightness of the homes, duct systems and sealed attics. GOALS To record the moisture content of the wood roof decks and relative humidity & temperature of the indoor ambient, the outdoor ambient and the attic for a 12 month period that includes the hot and humid summer months. 6 OBJECTIVES Two residential structures will be set up across Florida to acquire field data. Field data will be used to assess the potential of

moisture retention in the foam insulation, which can lead to structural damage to the sheathing. 7 SCOPE OF WORK Two houses to be identified in ASHRAE climatological zones 1 and 2. Conduct homeowners survey to document experience with sealed attics. Conduct blower door and duct blaster tests to determine air exchange rate. Install mini-data logger in attic to acquire data wirelessly.

8 Project Status 6 1 2 3, 4 7 8

5 9 FIELD INSTRUMENTATION Roof cross section showing the spray foam insulation with RH, temperature and moisture pins installed in the wood sheathing. 10

FIELD INSTRUMENTATION Campbell Scientific Data Logger CR6 Data acquisition system This instrument is used to collect data such as temperature and moisture Content. Minneapolis Duct Blaster System This instrument is used to determine the air leakage in the duct system of a house. 11

FIELD INSTRUMENTATION Moisture Pins Delmhorst Meter Blower Door Test is used to determine the air leakage through doors, windows and other openings. Moisture pins (nails) are used to determine the moisture content in the

wood sheathing. 12 CODAL PROVISIONS The Florida Building Code 2010 provides the following information 2304.11.4.2 WOOD STRUCTURAL MEMBERS Wood structural members that support moisturepermeable floors or roofs that are exposed to weather, such as concrete or masonry slabs, shall be of naturally durable or preservative-treated wood unless separated from such floors or roofs by impervious moisture barrier. 2603.4.1.6 Foam Plastics in Attics and crawlspaces Within an attic or crawlspace, foam plastic insulation shall be protected against ignition by 1.5in thick mineral fiber insulation, 0.25in wood structural panel or other

approved material installed in such a manner that the foam insulation is not exposed. 13 OUTCOME A Go/no Go decision for analytical study and benchmarks will be made based on the results of the field study. The Go decision will allow the ORNL computer toolkit to compare analytical models against empirical

findings of moisture accumulation. 14

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