Caulking Hardie Lap Siding

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 hardie lap siding.

Joint flashing butt joint horizontal lap treatment june 2014 james hardie does not recommend caulking butt joints or the horizontal overlaps joint flashing 6 in. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. This video is about how to like a pro. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.

Joint flashing is recommended for all hardie lap siding now. Optionally install the lap siding with a maximum 1 8 gap and caulk the joint see detail at right. 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. 25 4 mm on overlap no caulk figure 1 figure 2 9. Trim boards that sit on top the siding. 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.

Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed. In the old days the builder would install the trim bring the siding up to it and caulk the corner. 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. Install hardiplank siding with joints butted in moderate contact.