Installing Fiber Cement Siding Over Existing Cedar Siding - Remodeling - DIY Chatroom Home Improvement Forum

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Old 07-24-2009, 04:47 PM   #1
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Installing fiber cement siding over existing cedar siding

I currently have cedar siding that is failing, moisture from behind is not allowing us to keep the house painted/stained. The current setup is celotex, NO house wrap, 4" beveled cedar. Someone has suggested to apply the cement fiber siding over the existing cedar and adding house wrap/rain screen between the two. Any thoughts/advise would be helpful.


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Old 07-24-2009, 07:33 PM   #2
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housewrap then vertical furring nailed/screwed thru the cedar into the studs should work ok


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Old 07-24-2009, 08:12 PM   #3
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Moisture will have a bad effect on the cement board (if behind it)
You need to resolve that problem 1st
If the moisture is caused by the existing siding failing then the new siding should resolve that problem
Just make sure it isn't due to water intrusion somewhere else - roof/ wondows/flashing etc
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Old 07-24-2009, 11:17 PM   #4
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Is there any building (tar) paper? We always installed paper over celotex in the early '70's when I started framing.

Is the bevel failing everywhere, or just the weather side?

A picture would be helpful. And may I ask, where is your location?

If you are set on replacing the siding, I would remove the cedar. The black board - celotex, is keeping the walls from racking. I would use 30# tar paper or Typar, much better than Tyvek, in my opinion. The new siding would transition at the windows and doors easily with the cedar removed. Be safe, G
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