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Old 07-03-2015, 12:38 AM   #1
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I'm building a shop that has diagonal bracing on all walls, no plywood or OSB for racking support. I read a post that said Hardiboard should not be used over Celotex blackboard, and checked the Hardi site which has a form of disclaimer about it but has more to do with their warranty. Does anybody know if this is referring to a building that was improperly constructed with celotex as a racking preventer without diagonal bracing or ply/OSB in the corners, or is there an issue about moisture and breathing that is the problem? Celotex rates its breathablity higher than other options. My house is 60 years old, lap sided with pine 1X12's with Celotex underneath on all walls and have had no problems with it, and even used it 20 years ago in an addition, again with no problems.
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Old 07-03-2015, 01:49 PM   #2
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Originally Posted by CALNNC View Post
I'm building a shop that has diagonal bracing on all walls, no plywood or OSB for racking support. I read a post that said Hardiboard should not be used over Celotex blackboard, and checked the Hardi site which has a form of disclaimer about it but has more to do with their warranty. Does anybody know if this is referring to a building that was improperly constructed with celotex as a racking preventer without diagonal bracing or ply/OSB in the corners, or is there an issue about moisture and breathing that is the problem? Celotex rates its breathablity higher than other options. My house is 60 years old, lap sided with pine 1X12's with Celotex underneath on all walls and have had no problems with it, and even used it 20 years ago in an addition, again with no problems.

structural plywood / osb is used on all outside corners of structure if black board or foam is used. plywood on your corners and house wrap and could be good to go for hardie siding...
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