thickness specified by the system manufacturer and provide any other
reinforcement recommended by EIFS manufacturer. Trowel the reinforcing
fabric mesh into the wet base coat material. Fully embed the mesh in the
base coat. When properly worked-in, the pattern of the reinforcing fabric
mesh shall not be visible. Provide diagonal reinforcement at opening
corners. Back-wrap or edge wrap all terminations of the EIFS. Overlap the
reinforcing fabric mesh a minimum of 60 mm 2.5 inches on previously
installed mesh, or butted, in accordance with the manufacturer's
instructions.
][3.3.3.2
Class PM Systems
Mechanically fasten reinforcing fabric mesh to the insulated wall using the
type and spacing of fasteners specified in the manufacturer's instructions.
Provide diagonal reinforcement at opening corners. Mix base coat in
accordance with manufacturer's instructions. Apply base coat in accordance
with manufacturer's instruction to provide a complete, tight coating of
uniform thickness as specified by the manufacturer. Cover all fiberglass
reinforcing fabric, including at back wrapped areas at panel joints and at
fasteners.
]3.3.4
Finish Coat
The base coat/reinforcing mesh must be allowed to dry a minimum of 24 hours
prior to application of the finish coat. Surface irregularities in the
base coat, such as trowel marks, board lines, reinforcing mesh laps, etc.,
shall be corrected prior to the application of the finish coat. Apply and
level finish coat in one operation. Obtain final texture by trowels,
floats, or by spray application as necessary to achieve the required finish
matching approved [sample] [mock-up installation]. Apply the finish coat
to the dry base coat maintaining a wet edge at all times to obtain a
uniform appearance. The thickness of the finish coat shall be in
accordance with the system manufacturer's current published instructions.
Apply finish coat so that it does not cover surfaces to which joint
sealants are to be applied.
3.4
JOINT SEALING
Seal EIFS at openings as recommended by the system manufacturer. Apply
sealant only to the base coat or base coat with EIFS Manufacturer's color
coating. Do not apply sealant to the finish coat.
3.4.1
Surface Preparation, Backer Rod, and Primer
Immediately prior to application, remove loose matter from joint. Ensure
that joint is dry and free of finish coat, or other foreign matter.
Install backer rod. Apply primer as required by sealant and EIFS
manufacturer. Check that joint width is as shown on drawings but in no
case shall it be less than 13 mm 0.5 inch for perimeter seals and 20 mm
0.75 inch for expansion joints. The width shall not be less than 4 times
the anticipated movement. Check sealant manufacturer's recommendations
regarding proper width to depth ratio.
3.4.2
Sealant
Do not apply sealant until all EIFS coatings are fully dry. Apply sealant
in accordance with sealant manufacturer's instructions with gun having
nozzle that fits joint width. Do not use sealant that has exceeded shelf
life or can not be discharged in a continuous flow. Completely fill the
SECTION 07240
Page 24
Previous Page
