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Old 06-09-2008, 06:19 PM   #16
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Cemplank or Hardiplank installation question


Ok, easy enough. Follow AtlanticWBConst's advice on caulk for sure.

Before recaulking, you'll/they'll need to remove the existing caulk from the joints with a knife or putty knife. That way you're not caulking over caulk.

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Old 06-15-2008, 09:50 PM   #17
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Cemplank or Hardiplank installation question


Concrete shrinks period........... I have used numerous brands of cement siding and about every type of caulk and they all crack at the joints eventualy. Even if you can find a caulk that will bridge the gap between the largest spaces your house paint is bound to fail at the joints as it can not handle the movement like a good flexible caulk can. I suppose you could find a caulk that matches your house color so when the paint fails over the caulk it shows the same color but I would not bother.


My solution is to use splices but make sure and put them in tight as I have seen a house where the cement siding shrunk so much all the splices fell out of the South facing side.
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Old 06-15-2008, 10:16 PM   #18
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Cemplank or Hardiplank installation question


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Concrete shrinks period........... I have used numerous brands of cement siding and about every type of caulk and they all crack at the joints eventualy. Even if you can find a caulk that will bridge the gap between the largest spaces your house paint is bound to fail at the joints as it can not handle the movement like a good flexible caulk can...
Do some more research on Polyurethane, or Urethane caulk.
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Old 06-16-2008, 11:43 PM   #19
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Cemplank or Hardiplank installation question


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Do some more research on Polyurethane, or Urethane caulk.
No reasearch needed, plenty of caulk out there to handle the larger movement without failure. I have used Sonneborn NP1 with great results on various projects. Now just show me a regular house paint that can be applied to NP1 and handle the the movement without failure?
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Old 07-12-2008, 09:09 PM   #20
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Cemplank or Hardiplank installation question


I have HardiPlank siding on my home. It is 6 years old. The joints between planks on my house also cracked within a few months or a year. I dutifully picked all the caulk out and resealed them. However, they soon cracked again. After discussing with the manufacturer I found the recommendation to be "To follow the caulk manufacturer's installation guidelines". Meaning that the caulk typically will not adhere well in a butt joint, and the caulk certainly needs a minimum gap to be effective. A very narrow joint of 1/8" or less is too small to get an adequate bead of caulk in. The better method is to use some type of flashing behind the joints to help shed the water. My house had several problems with flashing, house wrap, design, drip guards, etc., so that now I am faced with tearing the back side of my house off to fix all the rot.
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Old 07-13-2008, 10:00 AM   #21
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Cemplank or Hardiplank installation question


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... The better method is to use some type of flashing behind the joints to help shed the water. My house had several problems with flashing, house wrap, design, drip guards, etc., so that now I am faced with tearing the back side of my house off to fix all the rot.
I've been saying this all along....
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Old 08-03-2008, 12:43 PM   #22
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Cemplank or Hardiplank installation question


I am currently getting bid for a siding job. The contractor at my house right now just offered cemplank as an alternative to hardiplank. He states the product is exactly the same...the only difference is that it is cheaper because you agree to a 25 year warrenty instead of the 50 year warranty that comes with "hardiplank"

He roughly put in the numbers for my house and the savings would be approximately $2,000.00. With this info I'm concerned the that the $400.00 offered in reagard to the mistake (contractor putting Cemplank on instead or hjardiplank) is not a fair compensation. I guess it would depend on the size of the house and number of planks...

I would ask for a larger discount..or call another contractor with the number of cemplank boards used on your house and ask what the price differnce would be.

As far as the caulking...it does not sound right...if it was nice and seamless at the completion and now is gapping or separating they need to re-do it. It could be weather dependent and not a true reflection of the quality of job they did, but they should fix it before you pay the final payment. And if it happens again in 2 weeks they should fix it again.

My 2 cents :0)


Last edited by skn; 08-03-2008 at 12:49 PM.
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