Hardie Siding But Joints

When james hardie siding products butt into wood based materials a 1 8 gap will allow for expansion and contraction of the wood based product.

Hardie siding but joints.

Flashing under field butt joints is necessary to keep water and weather away jharrison john harrison cmi june 19 2013 11 45pm 16. How to flash siding butt joints after the siding is installed a common problem with cement board siding products and some other types of horizontal lap siding is that older installation guidelines called for caulking the joint instead of flashing the joint. I think personally with the different methods of install on this product from. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.

Pre cut for quick and easy installation. Hardiplank lap siding must be installed correctly to perform properly. Hardiplank lap siding field butt joint flashing detail. A gap of up to 1 8 and caulked at the joint was an option in 2001 edition of the james hardie installation manual as shown below.

152 4 mm wide 1 in. 25 4 mm on overlap no caulk figure 1. A wraparound lower lip hooks the siding and requires one nail to hold it in place. Joint covers are primed on the outside for easy painting and coated on the inside with an epoxy backer to.

Joining hardie boards together is actually very easy but there are a number of ways that contractors get it wrong. Coating paint means no reflective flashback as found using regular metal flashing. 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. Hardie boards should be joined in moderate contact.

Joint flashing butt joint horizontal lap treatment june 2014 james hardie does not recommend caulking butt joints or the horizontal overlaps joint flashing 6 in. It s best to stagger the joints in each successive course to avoid noticeable patterns. Butt joints in adjacent courses should be spaced apart by at least two stud bays for 16 inch o c. Use to reduce moisture penetration behind the joint where two planks butt together and drain water over the top edge of the last full course of siding.

For walls longer than 12 feet you ll need to butt additional lengths of siding together. The joint covers protect the butt joint where two siding planks meet and provide an expansion joint to help prevent siding buckling. 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.