For additional information on finishing james hardie products download technical bulletin 22 from here.
Caulking james hardie 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.
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 is the world leader in fiber cement siding and backerboard.
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.
1 i chose this caulk because it has 25 flexibility compared to silicone based caulk.
Re applying caulking when it has begun to show signs of wear can help keep moisture from getting into the wall cavity.
Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed.
Lastly james hardie does not allow the use of colour matched caulking for touch ups.
Joint flashing is recommended for all hardie lap siding now.
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.
25 4 mm on overlap no caulk figure 1.
We ve been providing a better way to build for over 100 years.
James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.
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.
152 4 mm wide 1 in.
Osi quad product brochure.
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.
2 house built before 2008 so has no flashing okay to caulk.
Fiber cement siding repair or patching.