Manufacturing Member

  • Sto Corp.
  • Parex USA, Inc.
  • BASF Corporation – Wall Systems
  • Master Wall, Inc.
  • Dryvit Systems, Inc.

Associate Member

  • RADCO
  • Drew Foam Companies, Inc.
  • ADFORS Saint-Gobain
  • Plastic Components, Inc.
  • Clark Dietrich Building Systems
  • Georgia-Pacific Gypsum
  • Wind-lock Corporation
  • Wacker Chemical Corporation
  • National Gypsum Company
  • Poseidon Advanced Materials
  • Dow Construction Chemicals
  • Atlas EPS
  • Rodenhouse Inc.

Building Envelope Research and Testing

 

One of the cornerstones of the EIFS Industry Members Association is the research on EIFS and the exterior wall that is initiated and sponsored by EIMA. Below you will find information on EIMA's landmark research on the hygrothermal (moisture and energy) performance of EIFS and competing wall claddings. Phase III of this project took the results of Phases I and II and, through simulation, demonstrated how they were applicable in all U.S. climatic zones.

Summary

A three-phase study of the thermal and moisture control characteristics of exterior insulation and finish systems (EIFS) was initiated and funded through the U.S. Department of Energy (DOE) and in part by the nonprofit trade group EIFS Industry Members Association (EIMA). The study was conducted independently by the Oak Ridge National Laboratory (ORNL). In short, the results confirm that EIFS performs better than brick wall cladding in terms of energy efficiency and moisture control. This is provided that a vapor barrier, if used, is properly located within the wall, for the construction climate zone, and water intrusion is prevented by proper construction and maintenance.

Oak Ridge National Laboratory logo

Phase I – "The Hygrothermal Performance of Exterior Wall Systems"

Phase I consisted of construction, instrumentation, and data collection of eight wall cladding assemblies. The work was performed in Hollywood, South Carolina, near Charleston. Temperature and moisture sensors were installed in each of the assemblies. The wall assemblies were installed as discrete sections within the perimeter walls of a climate-conditioned “test hut”. The data were collected over the course of a year and document the performance of the wall assemblies in Climate Zone 3.

Phase II – "Exterior Wall Cladding Performance Study – Zone 3 Climates"

Phase II consisted of a computer modeled simulation of the performance of the wall assemblies which had been constructed and monitored in Phase I. The results of the simulations were compared to the actual data obtained in Phase I. The data closely compared to the simulation results. This validated that the computer model, WUFI—ORNL Version 5.0 , could be used to predict the performance of the tested wall assemblies in other climate zones.

Phase III – "Assessing Energy and Moisture Effects of EIFS vs. Brick"

Phase III used the computer modeling validated in Phase II to predict performance of four wall assemblies. A representative city was selected from each of the U.S. climate zones and historical weather data for the cities was used as input.

Zone City Zone City Zone City Zone City
1 Miami, FL 2 Austin, TX 3 Atlanta, GA 4 Baltimore, MD
5 Chicago, IL 6 Minneapolis, MN 7 Fargo, ND 8 Fairbanks, AK

Three EIFS assemblies were compared to a brick masonry assembly. The assemblies are summarized below:

Description Panel No. Exterior Insulation Stud-Cavity Insulation Exterior Sheathing Framing
Generic EIFS with Drainage 2 1.5-inch EPS R-11 Fiberglass Batt Plywood Nominal, 2 x 4 wood
Generic EIFS with Drainage 5 4.0-inch EPS None Plywood Nominal, 2 x 4 wood
Generic EIFS with Drainage 11 1.5-inch EPS R-11 Fiberglass Batt Gypsum 1.5" x 3.6", 18-ga. steel
Brick Masonry 14 None R-11 Fiberglass Batt OSB Nominal, 2 x 4 wood

Notes:

  1. All sheathing materials were exterior-grade.
  2. Stud spacing was 16-in. on-center for all panels.
  3. All EIFS panels included a fluid-applied water-resistive barrier coating applied to the exterior face of the sheathing, and exterior insulation was adhesively attached using a notched trowel to provide vertical paths for drainage.
  4. EIFS panels included glass-fiber mesh reinforced base coat and acrylic-based finish.
  5. The interior face of all panels was covered with ½-inch interior gypsum wallboard and a 10 perm interior paint.

Manufacturing Member

  • Parex USA, Inc.
  • Sto Corp.
  • Dryvit Systems, Inc.
  • BASF Corporation – Wall Systems
  • Master Wall, Inc.

Associate Member

  • Wind-lock Corporation
  • Drew Foam Companies, Inc.
  • Plastic Components, Inc.
  • RADCO
  • Atlas EPS
  • Poseidon Advanced Materials
  • Clark Dietrich Building Systems
  • National Gypsum Company
  • Wacker Chemical Corporation
  • Georgia-Pacific Gypsum
  • Rodenhouse Inc.
  • ADFORS Saint-Gobain
  • Dow Construction Chemicals
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