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.

Caulking hardie board siding. 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. 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. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.

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. While paint does tend to somewhat glue these pieces together caulking them is never advised and can cause permanent damage. Bottom of siding boards should not be caulked water is meant to exit through the bottom of each board.

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. All weather window door max shield by ge sealants and adhesive best caulking for hardie board siding in budget. Deterioration of the caulking in the joint has become a maintenance issue for home owners over time.

Osi quad product brochure. Rubber adhesive sealant caulk by flex shot best caulk for hardie board and interior objects. 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.