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General Description
The Preswitt System utilizes the standard
Non-Combustible System with modifications over a primary lamina
which has been trowelled over an approved substrate. The primary
lamina acts as an air barrier and as a secondary barrier against
water ingress into the building. Preswitt's M.P. Flexcoat mixed
50/50 by weight with Portland cement is the preferred trowelled
on membrane, however if its high resistance to water vapour transmission
conflicts with the building envelope design, Preswitt's regular
basecoat may be substituted. Reinforcing mesh is required in both
of these membranes. Peel and stick strips are applied at expansion
joints, window flanges and as required to create a complete sealed
air tight and weather resistant envelope. Careful inspection of
the envelope for leaks and necessary repairs is essential before
proceeding with the installation of the EIFS.
In order for the system to provide
drainage for incidental water intrusion and air pressure equalization
the following modifications to the mineral wool insulation and its
installation were introduced.
- The mineral wool panels are installed
vertically and each panel has a vertical groove cut in the back
section to assist air ventilation and provide a channel for egress
of incidental water that might find its way into the system. A
3/8" notched trowel is used to apply the adhesive compound
to the wall surface in a vertical manner.
- At the bottom of each wall section
the system is supported by a corrosion resistant angle which is
perforated to allow the introduction of air for pressure equalization
and allow incidental moisture that may have entered the system
to escape.
After installation of the insulation
the application of the reinforced N.C. Basecoat and Quality Finish
is the same as for the standard Non-Combustible EIF System.
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