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Three Year Study
• Funded by the US Department of Energy (DOE), through the Office of Energy Efficiency and Renewable Energy’s Building Technologies Program and the EIFS Industry Members Association (EIMA).
• Field research project conducted by Oakridge National Laboratory (ORNL)
•Purpose: To validate the moisture and thermal performance of EIFS Wall Systems. And to quantify the performance of EIFS over other types of exterior claddings.
• Conclusions:
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Liquid Applied Air and Water-Resistive Barriers (WRB)
• Liquid Applied WRB’s are applied with no seams: Unlike Housewraps and other sheet goods that are applied shingle style over sheathing substrates, you don’t have to worry about whether the product has been installed properly or with reverse laps that could leak.
• No fasteners penetrate the WRB: When combined with an adhesively attached Exterior Insulation Finish System, no fasteners such as staples or nails breach the air and water –resistive barrier.
• Liquid Applied WRB’s don’t trap moisture: Water vapor can condense between a housewrap or building paper and the sheathing of a framed wall. That cannot happen with a Liquid Applied WRB because it becomes integral to the sheathing to which it is applied.
• Liquid Applied WRB’s don’t tear or break down with UV exposure: Unlike building papers which tear over time from exposure to the elements, liquid applied membranes remain intact.
• Air Barriers and Energy Savings: The National Institute of Standards indicates that an effective air barrier can save up to 40% in annual heating and cooling costs. Because liquid applied WRB’s are monolithic with no seams or penetrations, they are one of the most effective air barrier choices.
• Passing moisture: Even if bulk water manages to bypass the primary layer of Exterior Insulation Finish System, the redundant nature of the liquid applied WRB keeps it out of the wall assembly.
• Penetrations and openings: Windows, AC units and other interruptions in the wall plane are specially flashed and treated by a variety of proprietary methods.
• Sheathing joints: Sheathing joints are treated by a variety of proprietary methods prior to the installation of the liquid applied WRB. |
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Drainage
• Adhesive Orientation: Adhesive is placed onto insulation boards with notched trowels so that the ribbons of adhesive are in a vertical orientation. When the insulation board is then attached to the surface of the sheathing that has been previously coated with the liquid applied WRB, a drainage plane is created.
• Independent proprietary research indicates that the drainage space can be as thin as a dime and still drain water quickly and effectively. |
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New Finish Choices
| • New look finishes now include: luminescent micas, fine aggregates, limestone, metallics, simulated brick and stains that emulate old world finishes. |
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