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Caulking Hardie Siding

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Old 06-14-2015, 07:57 AM   #1
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Caulking Hardie Siding

On new Hardie siding that is to be painted, are you caulking the butt joints between planks?
I plan to caulk where Hardie planks meet against trim boards but have heard mixed opinions in caulking butt joints. The boards are tight against each other, I would understand where there is a gap.

I appreciate any direction to this, I plan to prime with Loxon and finish with two coats of Resilience.

I also wonder if it's necessary why wouldn't it be caulked during installation? Surely that would be better? I know - "that's the painter's job".
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Old 06-14-2015, 08:10 AM   #2
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Re: Caulking Hardie Siding

Read the Hardie installation specs.......


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Old 06-14-2015, 12:26 PM   #3
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Re: Caulking Hardie Siding

I have always caulked my own installs. If it leaks, it won't be the painter they call back. If I didn't have to caulk, I could save days on most installs.

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Old 06-14-2015, 02:37 PM   #4
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Re: Caulking Hardie Siding

I would paint the seams, for when the panel shrinks..
I also use counter flashing of the same color as the siding color..
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Old 06-14-2015, 03:29 PM   #5
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Re: Caulking Hardie Siding

If the installers used flashing at the butt joints then you shouldn't caulk them, if there isn't a gap at the butt joints you shouldn't caulk them.

Caulking I consider part of the install and not left to the painter that may caulk butt joints that aren't supposed to be caulked. Or use the incorrect caulk.
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Old 06-14-2015, 04:14 PM   #6
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Re: Caulking Hardie Siding

We don't caulk butt joints unless they are non factory ends. Which we don't do. Flash properly, follow the install guidelines and let it ride.
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Old 06-14-2015, 04:54 PM   #7
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Re: Caulking Hardie Siding

I've always found that caulked joints look like crap. Flash them with a piece of color matched flat stock (best) or 30 lb felt (2nd best).
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Old 06-16-2015, 05:48 AM   #8
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Re: Caulking Hardie Siding

I appreciate all the comments, and thanks for the Hardie Link.


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