Caulking Hardiplank Lap Siding

12 hardiplank james hardie warranty claims information tel.

Caulking hardiplank lap siding.

152 4 mm wide 1 in. This video is about how to like a pro. 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. Many professionals like those at james hardie also agree that you should not use caulk on fiber cement siding unless there is no metal flashing underneath.

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. Joint flashing is recommended for all hardie lap siding now. 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.

Apparently no one here read the technical bulletin 9 that james hardie released in 2008. Osi quad product brochure. Flashing acts as a waterproofing layer for this type of siding and caulking will prevent the flashing from doing its job. Similar to paint previous coats of.

Lastly james hardie does not allow the use of colour matched caulking for touch ups. A diyer or a novice painter might attempt to achieve a cleaner look by caulking the siding nails but the nail is guaranteed to push the caulking material out within a few months. 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. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.

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. Is the old caulking removed before new coats are applied.