I think that gap between the two sheets (no matter how tight) is the culprit. It it essentially a break in the air path. For example I can't stack two sheets of ply on my spoilboard and expect the top sheet to be held firmly.
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I think that gap between the two sheets (no matter how tight) is the culprit. It it essentially a break in the air path. For example I can't stack two sheets of ply on my spoilboard and expect the top sheet to be held firmly.
Grothouse Lumber Company
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