Caulking Hardie Plank Siding

Rubber adhesive sealant caulk by flex shot best caulk for hardie board and interior objects.

Caulking hardie plank siding.

Trim boards that sit on top the siding. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. James hardie recommends the use of quality hot dipped galvanized nails. It s also recommended to use a cloth or rag ready to wipe up and smooth excess caulking before it sets on the siding what should never be caulked.

In the old days the builder would install the trim bring the siding up to it and caulk the corner. Fasteners must be corrosion resistant galvanized or stainless steel. 801 caulk 10 1 oz by dap best exterior caulk for hardiplank siding. Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed.

Can you tell me what gap you use between butt joints on horizontal lap siding and the best caulk for the joint. 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. 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 does not recommend using caulk or h jointers for the butt joints of hardieplank siding with colorplus technology.

If nail is countersunk caulk nail hole and add a nail. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. Electro galvanized nails are acceptable for use with james hardie siding products but may exhibit premature corrosion. 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.

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. Joint flashing is recommended for all hardie lap siding now.