Caulking Between Hardiplank Siding

Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed.

Caulking between hardiplank siding.

Any lower and you might see a few nail heads poking through the bottom of the next board any higher and your siding is likely to be loose and. 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. You need to have the best caulk for hardie siding to help your walls and wooden surfaces to get rid of open cracks and thin spaces between joints. Joint flashing is recommended for all hardie lap siding now.

Similar to paint previous coats of. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. 152 4 mm wide 1 in. Always caulk between the siding and the trim.

Flashing acts as a waterproofing layer for this type of siding and caulking will prevent the flashing from doing its job. The nails holding up the siding should not be caulked. 25 4 mm on overlap no caulk figure 1. James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2.

Is the old caulking removed before new coats are applied. Apparently no one here read the technical bulletin 9 that james hardie released in 2008. 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. Do not caulk between siding and any built in receiving channels located at or around windows.

Deterioration of the caulking in the joint has become a maintenance issue for home owners over time. Always prime or paint any cut edges that are inserted into a window j channel. Hardie plank siding has a nail line across the top of the board that is 1 down from the top and nails are supposed to fall between and 1 from the top of the board to give the best hold. But here the main problem is people usually don t find the right type of caulk for their works.

Osi quad product brochure. 1 i chose this caulk because it has 25 flexibility compared to silicone based caulk. 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. 2 house built before 2008 so has no flashing okay to caulk.

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. 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.