1.2.3.6
Absorption-Freeze/Thaw
Class PB systems shall be tested in accordance with EIMA TM 101.01 for 60
cycles of freezing and thawing. No cracking, checking, or splitting, and
neglible weight gain. Class PM systems shall be tested in accordance with
ASTM C 67 for 50 cycles of freezing and thawing. After testing, the
specimens shall exhibit no cracking or checking and have negligible weight
gain.
1.2.3.7
Sample Boards
Unless otherwise stated, provide sample EIFS Component 300 by 600 mm (12 by
24 inches), on sheathing board, including finish color and texture, typical
joints and sealant. If more than one color, finish, or pattern is used,
provide one sample for each.
The test specimen shall consist of
reinforcing mesh, base coat, and finish coat applied in accordance with
manufacturer's printed recommendations to the insulation board to be used
on the building.
1.2.4
Moisture Analysis
**************************************************************************
NOTE: Condensation of water vapor within the system
or wall assembly can lead to performance problems.
Condensation can cause leaks in the wall leading to
damage to the wall structure such as rotting of wood
studs, corrosion of metal framing, mold, staining
and discoloration of interior finishes, etc.
Moisture, if trapped in EIFS, expands upon freezing,
and it can damage the EIFS coatings. Should
analysis determine that the project design is
potentially subject to condensation or mold
problems,the installation of a vapor retarder,
changing the insulation thickness, or selecting a
different insulation material may be required.
For guidance see ASHRAE Handbook of Fundamentals,
1997, Chapter 22, Thermal and Moisture Control in
Insulated Assemblies - Fundamentals, and ASTM C 755,
Selection of vapor Retarders for Thermal
Insulations. The computer program MOIST, which is
on CCB, is a user-friendly tool based on hourly
weather data that provides information on moisture
content of building materials, the duration of high
moisture content excursions, and on surface relative
humidity.
The designer should consult with the system
manufacturer when evaluating EIFS for condensation
potential. Manufacturers typically offer water
vapor transmission analysis services at no cost to
designers and contractors.
**************************************************************************
Perform a job specific vapor transmission analysis based on project
specific climate and specified wall components and materials. Indicate the
temperatures and relative humidities for the inside and outside of the
building; a complete listing of the building components, their thickness,
thermal resistance and permeance, as well as building location and use. If
SECTION 07240
Page 13
Previous Page
