Caulking Hardie Lap Siding

Because almost all of the james hardie product installed in edmonton is prefinished colorplus siding the caulking will.

Caulking hardie lap siding.

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. 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. 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.

Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. 152 4 mm wide 1 in. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. 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.

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. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. We need air circulation behind these boards and the opening acts as a water exit should water ever go behind the boards. 25 4 mm on overlap no caulk figure 1.

On most new homes the trim goes up after the siding is installed which creates a large gap that should not be caulked. James hardie hardiplank lap siding installation instructions pdf 2001 jameshardie corp 26300 la alameda suite 250 mission viejo ca 92691. 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.