Recommended
Installation Methods
Roof Installation
Roof insulation rolls are
cut to lengths that will cover the distance from eave to eave, leaving a one
foot overhang on each side of the building. Occasionally more than one roll
may be needed to cover the entire roof, at which point it is common practice
to make a splice at a point nearest the ridge.
1) Start at the end of the
building and temporarily secure one end of the roll by attaching the
insulation to the eave strut with double-faced tape.
2) Pull the insulation
across the purlins with the vapor barrier toward the building interior.
Double-faced tape attached to the opposite end of the insulation will keep
tension on the roof roll while the metal panels are being attached over the
insulation.
3) Install the next roll in
the same manner, making sure the rolls are stretched tight, aligned properly
and closely butted.
4) Fasten tabs using one of
the methods described on the following page. Any rips or tears must be covered
with matching facing tape to ensure a tight vapor seal.
5) Trim excess insulation
flush to prevent it from acting as a wick and moving water into the building.
R-30 Banded System Installation Diagrams
Wall Installation
CMI
will usually
pre-cut wall pieces to length, rolling multiple cut pieces together into one
roll. The label will indicate the length and number of pieces. If the pieces
are not pre-cut, we recommend that all rolls be cut at a clean location to
avoid staining the insulation facing.
1) Cut the dimensions of the
insulation from the base angle to eave strut or rake, plus 6"-12" extra.
2) Attach one end of the
insulation to the base angle using double-faced tape.
3) Pull from the other end
to stretch the insulation tightly outside the girts to the eave or rake, and
attach with double-faced tape.
4) Make sure the facing is
toward the interior of the building and attach the panel to the structure.
5) Install the next roll in
the same manner, with edges butted snugly. Then fasten the tabs using one of
the methods described.
Fastening Tabs
Most facings are 6" wider
than the laminated fiberglass. This extra facing usually consists of two 3"
tabs or one 6" tab, each of which requires a different method of fastening. It
is advisable to use a starter roll for any method so that the insulation is
12" wider than the metal panels. This prevents you from having to work
directly at the panel edge when folding and stapling the tabs.
Two Tab Method
1) At the seam where two
rolls of insulation are joined, pull the tabs upward (toward the outside of
the building) and staple approximately every 8", ½” from the bottom of the
faced side of the insulation.
2) Next, fold the tab over
and staple between each original staple. CAUTION: Do not staple too close to
the base of the tabs or the staples may pull out, resulting in a poor vapor
seal. The tabs will now be stapled approximately every 4" assuring a tight
vapor seal.
3) Tuck the completed sealed
tab back into the joint.
4) Be sure to use matching
facing tape to repair any rips or tears in the insulation to guarantee a tight
vapor seal.
One Tab Method
This method is used when one
6" tab is supplied. The advantage of using the one tab method is that it can
be done from inside the building after the panels have been placed. A high
quality moisture-proof adhesive, or double-faced tape, is applied to the back
of the tab. The tab is then extended over the facing of the next roll of
insulation and fastened.
Trim Strips
The extent of their
usefulness is mainly cosmetic. Made from either aluminum or plastic, trim
strips are used to give insulation joints a more finished look. They provide
very little support and do not act as vapor barriers.
Installing Trim Strips on
Walls
1)
Pre-cut trim strips to the
height of the wall rather than working with a full roll.
2)
Locate the center line of the trim strips at
the joint of the insulation.
3)
With the finished side facing the interior of
the building, attach one end of the strip to the eave strut. Pull down over
the flange of the girts to a taut condition and fasten at the base angle. Be
careful not to put too much pressure on the strips as to pull the girts or
eave struts out of alignment. Only a few runs should be placed prior to
installation in order to minimize the possibility of misalignment.
Installing Trim Strips on
Roofs
Trim strips are installed on
the roof in the same manner as on the walls. However, we do suggest that
longer rolls be used, and that each strip be cut as needed.
1)
Position the first run to
cover the joint of the insulation.
2)
Attach the trim strip to the top of the eave
strut.
3)
Stretch the trim strips over the flanges of
purlins to the opposite eave.
4)
Fasten the trim strips to the eaves and to the
ridge purlins once correctly aligned.
On extremely wide buildings,
it is advisable to install additional fasteners at intermediate purlins to
ensure proper alignment. Special consideration should also be given to making
sure that trim strip fasteners are located under the panel corrugation so that
they don't interfere with panels.
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