Caulking James Hardie Siding

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. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. Lastly james hardie does not allow the use of colour matched caulking for touch ups.

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James hardie is the world leader in fiber cement siding and backerboard.

Caulking james hardie siding.

25 4 mm on overlap no caulk figure 1. Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed. 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. Do not use stains or oil based alkyd paints on james hardie products.

2 house built before 2008 so has no flashing okay to caulk. Joint flashing is recommended for all hardie lap siding now. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. Fiber cement siding repair or patching.

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. 152 4 mm wide 1 in. We ve been providing a better way to build for over 100 years. 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.

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. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. Osi quad product brochure. 1 i chose this caulk because it has 25 flexibility compared to silicone based caulk.

Deterioration of the caulking in the joint has become a maintenance issue for home owners over time. Re applying caulking when it has begun to show signs of wear can help keep moisture from getting into the wall cavity. For additional information on finishing james hardie products download technical bulletin 22 from here. James hardie recommends the use of caulks and sealants that remain permanently.

Apparently no one here read the technical bulletin 9 that james hardie released in 2008.

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