Installation Guide

Installation:
16
Armaflex sheet on metal
ductwork
The preferred method for square
and rectangular ducts is to cut
and fit the sheets, using full cov-
erage of Armaflex 520 or 520
BLV Adhesive to adhere the
insulation.
1. Measure—Sheets should be
sized with the following appli-
cation sequence in mind. Cut
the bottom piece first, making
it the same width as the duct.
Then cut the two side pieces,
so that they extend down over
the edges of the bottom insu-
lation; keep top edges flush
with the top of the duct. The
top insulation should be sized
so that it extends over the side
insulations. The fabrication
must be done at the job site,
at the same ambient condi-
tions as the application.
2. Cut—A sharp knife and a
straightedge are the only tools
required. Armaflex Sheet cuts
cleanly.
3. Apply Adhesive—First brush-
or roller-coat 520 or 520 BLV
Adhesive on the metal duct
surface. Then coat the back
side of the Armaflex Sheet,
leaving a 1/2″-wide uncoated
border at butt-edge seams.
Allow the adhesive to dry to
the touch but still tacky under
slight pressure before joining
surfaces.
4. Bond—Position the sheet so
that it overlaps the edges of
previously installed sheet or
sheets by 1/8″. Hold the sheet
in this position, and spot-adhere
it in the center. Compress the
butt edges into place for a tight
joint with adjoining sheets. Then
bond the remainder of the
sheet by pressing it firmly into
place. A small hand roller will
help apply pressure.
5. Adhere Joints—Spread the
joint, and with a small brush,
apply 520 or 520 BLV
Adhesive to both butt edges.
Do not flood joint with adhe-
sive. Align carefully for good
appearance, and apply pres-
sure to joint.
6. Standing Seams—These can
be insulated with strips of
Armaflex Sheet, generally cut
from scrap.
7. Alternate Method—Standing
seams can also be insulated
with half sections of Armaflex
Pipe Insulation, corresponding
in thickness to the sheet used
on the duct surface. Ends
should be miter-cut to insure
tight fit when bonded.
8. Apply WB Armaflex Finish—
Two coats of WB Armaflex
Finish, a white water-based
latex enamel coating, are all
that is required to provide a
protective finish for outdoor
installations. WB Armaflex
Finish can be brush- or roller-
applied.
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Please note: For installing self
adhering SA Armaflex sheets and
rolls, refer to p.19.