Yes it is.
We offer a great alternative that accomplishes the same protection!
Silicone Vapor Paper: SKU # 10021412 $19.99/EA
Area coverage: 400 sqft per roll
Roll size: 34" x 141' x 0.006"
Used as a moisture vapor retarder under floating, nail or staple down floors over wood substrates.
Recommended to use over crawl spaces, basements and garages.
Allows boards to be slid and assembled easier. Reduces squeaks.
Can be used in layers to "build up" differences in subfloor irregularities.
Slows down the natural upward moisture vapor transmission.
VOC free (Volatile Organic Compound).
100% recycled and recyclable USA made paper.
Will not mark walls like tar paper.
Best Choice over radiant heat systems.
*Perm Rating is .46 without nail holes and .712 with nail holes.
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Answered on 10/16/2015 by cc-2