Caulking Between Hardiplank Siding

Leave a 1 8 gap between the siding and the trim or other materials to allow for structural movement.

Caulking between hardiplank siding.

Osi quad product brochure. 152 4 mm wide 1 in. But here the main problem is people usually don t find the right type of caulk for their works. 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.

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. 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. 25 4 mm on overlap no caulk figure 1.

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. 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. Deterioration of the caulking in the joint has become a maintenance issue for home owners over time. 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.

James hardie also does not recommend applying caulk to the horizontal overlap between siding planks see figure 2. Similar to paint previous coats of. 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. 1 i chose this caulk because it has 25 flexibility compared to silicone based caulk.

Is the old caulking removed before new coats are applied. Do not caulk between siding and any built in receiving channels located at or around windows. Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. Apparently no one here read the technical bulletin 9 that james hardie released in 2008.

Joint flashing is recommended for all hardie lap siding now. Always caulk between the siding and the trim. 2 house built before 2008 so has no flashing okay to caulk. The nails holding up the siding should not be caulked.

Flashing acts as a waterproofing layer for this type of siding and caulking will prevent the flashing from doing its job. If you use sashco s acrylic latex caulking sealant you can have any interior or exterior as good as new.