Hardie Plank Siding Joints

Hardieplank lap siding with colorplus technology is shipped with a protective laminate slip sheet which should be left in place during cutting and fastening to reduce marring and scratching.
Hardie plank siding joints. Joining hardie boards together is actually very easy but there are a number of ways that contractors get it wrong. James hardie is the world leader in fiber cement siding and backerboard. Joint flashing butt joint horizontal lap treatment june 2014 james hardie does not recommend caulking. Butt joints in hardieplank lap siding should always land on a stud.
The current edition of the james hardie manual along with the international residential code irc and residential edition of the florida building code fbc offers three options for butt joints. Place cut ends where the siding meets a corner door. We include diagnostic inspection photos and text explain how to recognize diagnose and cure this problem. Whenever possible factory finished ends should be used at butt joints.
James hardie does not recommend using caulk or h jointers for the butt joints of hardieplank siding with colorplus technology. Hardie board siding can be made to mimic just about any other siding material including wood lap boards cedar shingles and wood shake siding. We ve been providing a better way to build for over 100 years. Butt joints between studs are not recommended and should be avoided.
This article series includes field reports of fiber cement board lap siding butt joint gap problems fiber cement moisture problems and other fiber cement lap siding installation or in service defects their diagnosis repair. Hardie plank joints butt joints james hardie siding is 12 feet long which means that siding on your longer walls will need to join together. Color options are virtually unlimited. Strip of flashing water resistive barrier under the joint.
H joint cover like the one shown at top of this page. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. Hardie boards should be joined in moderate contact.