Caulking Between Hardiplank Siding

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.

Caulking between hardiplank siding.

Joint flashing is recommended for all hardie lap siding now. 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. If you use sashco s acrylic latex caulking sealant you can have any interior or exterior as good as new. Apparently no one here read the technical bulletin 9 that james hardie released in 2008.

Vertical trim gap caulking. 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.

Caulking around windows doors eaves and trim edges gives added insurance that leaks will not occur. 152 4 mm wide 1 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. Flashing acts as a waterproofing layer for this type of siding and caulking will prevent the flashing from doing its job.

Always prime or paint any cut edges that are inserted into a window j channel. 1 i chose this caulk because it has 25 flexibility compared to silicone based caulk. Osi quad product brochure. 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.

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. Hardie no longer recommends the caulking of any joint in their lap siding colorplus or primed. But here the main problem is people usually don t find the right type of caulk for their works. 2 house built before 2008 so has no flashing okay to caulk.

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. Do not caulk between siding and any built in receiving channels located at or around windows. Is the old caulking removed before new coats are applied. The nails holding up the siding should not be caulked.

25 4 mm on overlap no caulk figure 1. Always caulk between the siding and the trim.