Caulking Hardie Plank Siding

Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed.

Caulking hardie plank siding.

Trim boards that sit on top the siding. 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. If nail is countersunk caulk nail hole and add a nail. 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.

Joint flashing is recommended for all hardie lap siding now. Electro galvanized nails are acceptable for use with james hardie siding products but may exhibit premature corrosion. Deterioration of the caulking in the joint has become a maintenance issue for home owners over time. All weather window door max shield by ge sealants and adhesive best caulking for hardie board siding in budget.

How much expansion contraction is going to take place with this siding. I am planning to install horizontal hardie plank lap siding and the hardie info says use a latex sealant per astm c834 or c920 grade ns class 25. Can you tell me what gap you use between butt joints on horizontal lap siding and the best caulk for the joint. James hardie recommends the use of quality hot dipped galvanized nails.

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. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. Rubber adhesive sealant caulk by flex shot best caulk for hardie board and interior objects. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur.

Fasteners must be corrosion resistant galvanized or stainless steel. 801 caulk 10 1 oz by dap best exterior caulk for hardiplank siding.