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The Water Cooler
General Discussion
Spray foam under roof decking.
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<blockquote data-quote="Shinneryfarmer" data-source="post: 4057625" data-attributes="member: 46291"><p>A cousin of mine experimented with spray on insulation and what is called blue board down in SE states. He did a wood frame roof, 1/2 spray in and 1/2 blue board. He determined over time the spray in due to humidity caused moisture to collect in the decking leading to rot. The blue board didn't experience the same issue. It was cut to fit tightly between rafters. R value was a little less than spray in but no issues over time. Both were pest attractions burrowing into it to make their homes but with pesticides they were controlled.</p><p></p><p>PS: This was done many years ago so material composition today may differ and have differing results.</p><p>[ATTACH]386053[/ATTACH]</p></blockquote><p></p>
[QUOTE="Shinneryfarmer, post: 4057625, member: 46291"] A cousin of mine experimented with spray on insulation and what is called blue board down in SE states. He did a wood frame roof, 1/2 spray in and 1/2 blue board. He determined over time the spray in due to humidity caused moisture to collect in the decking leading to rot. The blue board didn't experience the same issue. It was cut to fit tightly between rafters. R value was a little less than spray in but no issues over time. Both were pest attractions burrowing into it to make their homes but with pesticides they were controlled. PS: This was done many years ago so material composition today may differ and have differing results. [ATTACH alt="Screenshot_20230619-113603_Samsung Internet.jpg"]386053[/ATTACH] [/QUOTE]
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The Water Cooler
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Spray foam under roof decking.
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