Caulking Hardie Board Siding

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Caulking hardie board 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. Caulking them is a mistake and the caulking is likely to fail prematurely. 152 4 mm wide 1 in. Deterioration of the caulking in the joint has become a maintenance issue for home owners over time.

Osi quad product brochure. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. Overview rubber adhesive sealant caulk by flex shot best caulk for hardie board and interior objects. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.

Because almost all of the james hardie product installed in edmonton is prefinished colorplus siding the caulking will be available in. Joint flashing is recommended for all hardie lap siding now. Bottom of siding boards should not be caulked water is meant to exit through the bottom of each board. 25 4 mm on overlap no caulk figure 1.

Apparently no one here read the technical bulletin 9 that james hardie released in 2008. This video is about how to like a pro. 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. 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 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.