Caulking Hardie Board Siding

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.

Caulking hardie board siding.

Bottom of siding boards should not be caulked water is meant to exit through the bottom of each board. Deterioration of the caulking in the joint has become a maintenance issue for home owners over time. 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.

Joint flashing is recommended for all hardie lap siding now. All weather window door max shield by ge sealants and adhesive best caulking for hardie board siding in budget. Rubber adhesive sealant caulk by flex shot best caulk for hardie board and interior objects. Osi quad product brochure.

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

While paint does tend to somewhat glue these pieces together caulking them is never advised and can cause permanent damage. 152 4 mm wide 1 in. 25 4 mm on overlap no caulk figure 1 figure 2 9. 801 caulk 10 1 oz by dap best exterior caulk for hardiplank siding.