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Old 02-13-2007, 05:58 PM   #1
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How can you tell if lauan is exterior grade or not?


Is there a way you can tell just by looking? I'm interested in 1/4" type 1 lauan as an underlayment. Thanks

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Old 02-13-2007, 07:17 PM   #2
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How can you tell if lauan is exterior grade or not?


Just a thought... to my knowledge laun is not approved as an underlayerment by any flooring manufacturer.

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Old 02-14-2007, 07:55 AM   #3
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How can you tell if lauan is exterior grade or not?


Exterior grade plywood, paneling, etc. should be marked, such as CD-X for C grade on one side, D grade on the other, and X for exterior.
I have never seen exterior grade luan nor, as troubleseeker said, have I ever heard of it being approved for underlayment, although it is used as a spacer and leveler sometimes.
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Old 02-14-2007, 03:57 PM   #4
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How can you tell if lauan is exterior grade or not?


I see. I was just at lowes and saw some exterior grade lauan but it wasn't marked as far as I could tell. The only reason why I knew it was exterior grade was because that's what it said next to the price tag. They sold smaller 2x4 sheets that wasn't labeled as such but I noticed that the middle layer was much thinner than the 4x8 exterior grade lauan I saw but still 1/4". Not sure what to make of it. I realize it's not approved but many contractors and diyers do use it for that purpose.
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