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non vented to vented roof structure Post New Topic | Post Reply
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Bruce Watson
Posted: Sep 19, 2024 03:19 PM
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non vented to vented roof structure
Just framed an open beam ceiling. 2x10" roof joists and 2x tongue and groove ceiling boards face nailed to rafters -air side/room ceiling. Calls for closed cell spray insulation. Since I didn't spray "from below" before installing the T&G ceiling boards - looks like I need to spray from above. R-30 = 5" inches right? Do I now need to add ventilation above the 5"inches of closed cell". Might be cost prohibitive to spray the entire 9-1/2"inches - right?
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