Technical Specifications

19
INSIDE CORNERS, WINDOWS,
& DOORS
ALL APPLICATIONS
Appropriate flashing should be used to
prevent moisture penetration on all inside
corners, doors, and windows. Refer to local
building codes for best practices. Cut and
exposed panel edges must be primed or
sealed with fiber cement sealer or paint.
INSIDE CORNERS
SINGLE FLANGE SEALANT BACKER
(FHK 1017)
Decide primary line of sight in order to
minimize visibility of the sealant joint.
Install the panel (ship-lapped edges at the
joint will need to be cut off) on the front wall
(more visible) first. Ensure panel is butted
up tight to the inside corner wall. Fasten the
Single Flange Sealant Backer onto the side
wall right up against the front wall panel’s
edge at 12-14” o.c.
Install side wall panel directly against the
sealant backer and secure with Panel Clips.
Fill space with sealant. (Fig. 38-40)
TRIM BOARDS
Install trim boards at inside corner first and
butt cut panel edges with a minimum ¼” gap.
Single Flange Sealant Backer can also be used
where panels butt to trim boards. Add ASTM
C920 compliant sealant to the gap.
PANEL INSTALLATION
Fig. 38
Fig. 40
3/8" SEALANT JOINT OVER SINGLE
FLANGE SEALANT BACKER
NICHIHA PANEL
NICHIHA CLIP
Fig. 39