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Old 09-28-2008, 01:42 PM   #1
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Best caulk for Hardie Plank siding?


I am planning to install horizontal Hardie Plank lap siding and the Hardie info says use a latex sealant per ASTM C834 or C920 (Grade NS, Class 25).

Can you tell me what gap you use between butt joints on horizontal lap siding and the best caulk for the joint?

How much expansion / contraction is going to take place with this siding?

Thanks much.

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Old 09-28-2008, 02:01 PM   #2
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Best caulk for Hardie Plank siding?


I believe they make a special caulk just for fiber cement now.

1/8" gap at butt and trim joints.

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Old 09-28-2008, 02:54 PM   #3
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Best caulk for Hardie Plank siding?


Yes they do! its made by Tight-Bond Its called tight bond weathermaster caulk, it comes in 125 variety of matched colors. Excelant gap filling and will not slump into the gap. BOB
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Old 09-28-2008, 03:45 PM   #4
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Best caulk for Hardie Plank siding?


i'm curious too,---> How much expansion / contraction is going to take place with this siding? <--- and shouldn't there be flashing in there somewheres?......but what do i know? i'm just a cartoon mouse......

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Old 09-28-2008, 03:57 PM   #5
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Best caulk for Hardie Plank siding?


When installing any lap siding, it is always a good practice to "flash" behind each butt joint with a small piece of 15# felt. Same thing at the trim and the ends' joint.
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Old 09-28-2008, 05:53 PM   #6
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Best caulk for Hardie Plank siding?


From my experience, there's minimal expansion/contraction with this product. I believe the specified gap is mainly so that you can get caulk between the planks.
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Old 09-28-2008, 06:13 PM   #7
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Best caulk for Hardie Plank siding?


Per Hardi's instructions if you flash behind the joint you can butt them up. I still caulk them
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Old 09-28-2008, 08:02 PM   #8
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Best caulk for Hardie Plank siding?


Yeah, I would never butt them tight. The flashing is the guarantee that if water gets in, it will be shed down. It would be insane to install any kind of lap siding without a tin shingle or building felt behind the joint. I look at the caulking as an added means of protection.

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