Caulking Hardie Lap Siding

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

Caulking hardie lap siding.

James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. Optionally install the lap siding with a maximum 1 8 gap and caulk the joint see detail at right. Resistive barrier is required. In the old days the builder would install the trim bring the siding up to it and caulk the corner.

Joint flashing is recommended for all hardie lap siding now. 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. The first course of any wall should be installed over a 1 4 lath strip to ensure a consistent plank angle see figure 1. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur.

Install hardiplank siding with joints butted in moderate contact. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. 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. 152 4 mm wide 1 in.

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. 25 4 mm on overlap no caulk figure 1 figure 2 9. This video is about how to like a pro. 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.