James hardie is the world leader in fiber cement siding and backerboard.
Caulking james hardie siding.
For additional information on finishing james hardie products download technical bulletin 22 from here.
2 house built before 2008 so has no flashing okay to caulk.
25 4 mm on overlap no caulk figure 1.
Joint flashing is recommended for all hardie lap siding now.
Fiber cement siding repair or patching.
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.
Osi quad product brochure.
We ve been providing a better way to build for over 100 years.
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.
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.
Deterioration of the caulking in the joint has become a maintenance issue for home owners over time.
Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur.
1 i chose this caulk because it has 25 flexibility compared to silicone based caulk.
Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed.
James hardie recommends the use of caulks and sealants that remain permanently.
Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur.
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.
152 4 mm wide 1 in.