How To Seal Hardie Board Siding Joints

It is similar to traditional beveled wood lap siding.

How to seal hardie board siding joints.

Joining hardie boards together is actually very easy but there are a number of ways that contractors get it wrong. If you have loose hardieplank siding on your home it is important to fix it. Hardieplank is a brand of fiber cement board that is used for exterior siding projects. A lot of moisture from rain snow misdirected sprinklers or exuberant water fights can get in there enough to do some serious and expensive damage.

Apparently no one here read the technical bulletin 9 that james hardie released in 2008. Deterioration of the caulking in the joint has become a maintenance issue for home owners over time. 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. This has proven problematic over time as caulking the joint results in unsightly surface appearances due to the different textures as well as resulted.

James hardie recommends butting field joints together in moderate contact to achieve a continuous looking joint. Butt joints are a perfect example of poor joint design they re too small to accommodate a bond breaker so the caulk can t stretch properly once applied but they re also too large to simply leave alone. Hardie boards should be joined in moderate contact. Joint flashing is recommended for all hardie lap siding now.

Improved appearance when installed properly flashing at a field butt joint creates a better looking joint. James hardie believes it is good building practice to seal the joints to prevent moisture such as wind driven rain and snow from penetrating the wall cavity. Laps will need to be periodically removed and or reapplied to maintain the seal over the life of the building. If you use sashco s acrylic latex caulking sealant you can have any interior or exterior as good as new.

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. You need to have the best caulk for hardie siding to help your walls and wooden surfaces to get rid of open cracks and thin spaces between joints. Loose siding can leave your home unprotected from weather and insects.