Caulking Hardiplank Lap 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 hardiplank lap 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. 152 4 mm wide 1 in. 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. 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.

Similar to paint previous coats of. Apparently no one here read the technical bulletin 9 that james hardie released in 2008. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed.

This video is about how to like a pro. Osi quad product brochure. Is the old caulking removed before new coats are applied. Flashing acts as a waterproofing layer for this type of siding and caulking will prevent the flashing from doing its job.

25 4 mm on overlap no caulk figure 1. Joint flashing is recommended for all hardie lap siding now. 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.

The nails holding up the siding should not be caulked. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. 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.