152 4 mm wide 1 in.
Caulking hardiplank lap siding.
Apparently no one here read the technical bulletin 9 that james hardie released in 2008.
Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed.
Deterioration of the caulking in the joint has become a maintenance issue for home owners over time.
Joint flashing is recommended for all hardie lap siding now.
Similar to paint previous coats of.
This video is about how to like a pro.
Is the old caulking removed before new coats are applied.
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.
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.
This technical bulletin is an explanation supporting the announcement made by james hardie on september 8th 2008 withdrawing its recommendation on the use of caulk at field butt joints for hardieplank lap siding.
12 hardiplank james hardie warranty claims information tel.
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.
Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur.
James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.
The nails holding up the siding should not be caulked.
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.
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.
Lastly james hardie does not allow the use of colour matched caulking for touch ups.