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Thanks for posting this important and all too little known information. In my neck of the woods, Saskatchewan, Canada, spray foam insulation is gaining popularity. I would like to know more about the proper installation and uses for this. I wonder about the dew point and what happens to the moisture. Do you guys in Florida need to consider the dew point? Thought it might be an ideabook suggestion for you.
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Ramble Studio

One important thing to point out is that Hardie does not warrant a horizontal joint that doesn't lap or have a z-channel flashing. While the open joint look is awesome, I still haven't figured out how to detail it that way and keep the warranty...

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