Hardie no longer recommends the caulking of any joint in their lap siding (colorplus or primed). Deterioration of the caulking in the joint has become a maintenance issue for home owners over time. Joint flashing is recommended for all hardie lap siding now.Click to see full answer. Correspondingly, should you caulk fiber cement siding?Many professionals, like those at James Hardie, also agree that you should not use caulk on fiber cement siding unless there is no metal flashing underneath. Flashing acts as a waterproofing layer for this type of siding, and caulking will prevent the flashing from doing its job.Also Know, how do you caulk Hardie plank siding? Wherever Hardie siding meets a trim board, the company recommends you leave a 1/8” gap between the siding and the trim and apply a 3/8” bead of approved caulking to protect and seal the edge of the siding. Keeping this in consideration, should you caulk under siding? Bottom of siding boards should not be caulked Water is meant to exit through the bottom of each board. While paint does tend to somewhat glue these pieces together, caulking them is never advised and can cause permanent damage. Also, avoid caulking tongue-and-groove siding boards together.Does caulking Hardie board void the warranty?James Hardie siding is a fiber-cement product that comes with a 30 or 50 year warranty, but any warranty will be void if the product is improperly installed. Gutters must be kept 1″ away from the siding, and kickout flashing needs to be installed. Must be kept 1/4″ above flashing above windows, and not caulked here.
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