Technical Specifications

25
NON-90 DEGREE CORNERS & RADII
Corners other than 90 degrees can be achieved
with custom metal trim, butting panels to trim
board with a minimum ¼” sealant gap, or with
the use of Double Flange Sealant Backer (refer to
Vertical Control/Expansion Joint section) to set
cut panel edges at the desired corner angle.
The Double Flange Sealant Backer detail can be
utilized to accommodate use of AWP on radius
walls. Do not attempt to curve AWP. Contact the
Nichiha Technical Department for assistance.
VERTICAL CONTROL/
EXPANSION JOINTS
ALL APPLICATIONS
Vertical Control/Expansion Joints are required
approximately every 30 feet on installations of
50 feet and greater without corners or off-sets
(i.e. windows, doors, or bump outs), including
within 2 to 10 feet of outside corners (on both
walls). For example, a 60-foot wall with two
outside corners would require three vertical
control joints: one near each outside corner
and one towards the center.
When Nichiha Corners are used, the outside
corner requirement is satisfied.
Install vertical control joint (Nichiha Double
Flange Sealant Backer - FH1020) to butt
up against panel at a pre-determined joint
location and secure joint to substrate on
one side (the right side flange) at 12” - 14”
o.c. Double Flange Sealant Backer may be
fastened to plywood/OSB sheathing, framing/
furring member (added if necessary to pre-
planned joint locations), or blocking.
Panel ship-lapped edges must be cut off to
achieve a tight fit against the sealant backer.
Install next panel to joint and secure with
Panel Clips. (Figure 51)
Apply low-adhesive tape along the length of
the panel and trim edges to protect panel
from sealant and for a smoother look when
the sealant is applied and tape removed.
Apply ASTM C-920 compliant sealant into the
expansion joint, starting at the bottom and
pushing sealant into the gap.
Add framing/blocking to fasten
Sealant Backer and panel edges
Fig. 51