Caulking James Hardie Siding

Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur.

Caulking james hardie siding.

Do not use stains or oil based alkyd paints on james hardie products. 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. Apparently no one here read the technical bulletin 9 that james hardie released in 2008. 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.

James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. 2 house built before 2008 so has no flashing okay to caulk. Lastly james hardie does not allow the use of colour matched caulking for touch ups. 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.

Joint flashing is recommended for all hardie lap siding now. Fiber cement siding repair or patching. Deterioration of the caulking in the joint has become a maintenance issue for home owners over time. It will look okay on day one but caulk is not designed to be used as a touch up and it will weather at a different pace than the siding.

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

For additional information on finishing james hardie products download technical bulletin 22 from here. Re applying caulking when it has begun to show signs of wear can help keep moisture from getting into the wall cavity. We ve been providing a better way to build for over 100 years. Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed.

Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur.