Caulking Hardie Board Siding

Bottom of siding boards should not be caulked water is meant to exit through the bottom of each board.

Caulking hardie board 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. James hardie color match caulk osi quad caulk for exterior door window and siding applications color matched to james hardie colors uv water resistant will not crack or yellow 1 tube covers 29 lineal feet at 1 4 bead width or 13 lineal feet at a 3 8 bead width paintable. 801 caulk 10 1 oz by dap best exterior caulk for hardiplank siding. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.

Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed. Joint flashing is recommended for all hardie lap siding now. Rubber adhesive sealant caulk by flex shot best caulk for hardie board and interior objects. All weather window door max shield by ge sealants and adhesive best caulking for hardie board siding in budget.

Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. While paint does tend to somewhat glue these pieces together caulking them is never advised and can cause permanent damage. 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. Also avoid caulking tongue and groove siding boards together.

Osi quad product brochure. 25 4 mm on overlap no caulk figure 1 figure 2 9. 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.