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Old 07-12-2010, 01:47 AM   #1
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Sealant to use with Hardiplank siding


We are getting ready to repaint the Hardiplank siding on our home in Oregon where it rains. We were told to use Sonolastic TX 1 sealant to seal the butt joins & around our windows on our Hardiplank siding.
Is this what you would use?

Thanks John

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Old 07-12-2010, 05:17 PM   #2
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Sealant to use with Hardiplank siding


Wasn't this caulked when it was first installed? Are there gaps now that should be sealed? I'm not familiar with the caulking mentioned, but whatever caulk you use, it should stay flexible and be paintable.
Ron

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Old 07-12-2010, 07:15 PM   #3
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Sealant to use with Hardiplank siding


Oddly, They were not sealed when installed.
So my question is would it be okay to seal with Sonolastic TX 1?
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Old 07-12-2010, 07:23 PM   #4
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Sealant to use with Hardiplank siding


I’ve never seen or used TX 1 but from what I just read on the product it’s a polyurethane caulking. Vulkem and Quad are also polyurethane caulking’s and are both readily available off the shelf in any lumber, hardware, or big box store in Oregon. Both have served me just fine.

West of the Cascades, always Poly and never Silicone.
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Old 07-12-2010, 08:03 PM   #5
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Sealant to use with Hardiplank siding


Thank you for this information.
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Old 07-12-2010, 08:12 PM   #6
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Sealant to use with Hardiplank siding


"West of the Cascades, always Poly and never Silicone."
Why is that?
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Old 07-13-2010, 02:21 AM   #7
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Sealant to use with Hardiplank siding


i wonder if that hardi was flash installed. if flashing was used behind the plank it could explain why you have no caulk
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Old 07-13-2010, 06:19 AM   #8
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Sealant to use with Hardiplank siding


Quote:
Originally Posted by Ron6519 View Post
"West of the Cascades, always Poly and never Silicone."
Why is that?
Ron
Silicone just doesn't stick in wet environments.

A couple of years and you can grab that bead and easily pull it out. You can’t do that with poly.
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Last edited by kwikfishron; 07-13-2010 at 06:27 AM.
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Old 07-13-2010, 03:39 PM   #9
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Sealant to use with Hardiplank siding


Few years ago, Hardie said no caulking at butts around here..... now:

For best results use an Elastomeric Joint Sealant complying
with ASTM C920 GradeNS, Class 25 or higher or a Latex
Joint Sealant complying with ASTM C834. Caulking/Sealant
must be applied in accordance with the caulking/sealant
manufacturer’s written instructions or ASTM C1193.
From: http://www.jameshardie.com/pdf/insta...plank-hz10.pdf


Be safe, Gary
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Old 07-13-2010, 08:06 PM   #10
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Sealant to use with Hardiplank siding


Im a big fan of the Quad, it gets messy on the fingers and requires minieral spirits to clean as it is a poly, but paints over well and flexes well in our winter/summer seasons. I tried DAP acrylic on my first door project and by next year was peeling it off by hand.
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Old 07-13-2010, 10:05 PM   #11
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Sealant to use with Hardiplank siding


What type of paint to repaint my Hardieplank siding.
I am told "not" to use oil base paint.
That leaves me with exterior Acrylic paint.
Is this the same as Latex paint?
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Old 07-16-2010, 10:01 PM   #12
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Sealant to use with Hardiplank siding


Quote:
Originally Posted by kwikfishron View Post
Silicone just doesn't stick in wet environments.

A couple of years and you can grab that bead and easily pull it out. You can’t do that with poly.
I have never had trouble with silicone peeling off when it was applied under the proper conditions....the problem for me in this application is that silicone is not paintable. We use urethane to caulk all Hardi and Azek work, the stuff is tenacious. This is what they use to caulk vinyl replacement windows in place, so it is readily available at our local supplier, and I feel a higher quality product than the typical big box urethanes.
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Old 07-16-2010, 10:08 PM   #13
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Sealant to use with Hardiplank siding


Quote:
Originally Posted by JPGO View Post
What type of paint to repaint my Hardieplank siding.
I am told "not" to use oil base paint.
That leaves me with exterior Acrylic paint.
Is this the same as Latex paint?
Generically speaking latex refers to a product that uses water instead of a solvent as the carrier. Acrylic is the additive that makes or breaks the quality of the paint. Use a quality brand like Sherwin Williams or Benjamin Moore, but if you decide on another brand, look for the words "100% acrylic" on the label.

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