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Plywood 3/16in

Underlayment (Common: 7/32 in. x 4 ft. x 8 ft.; Actual: 0.196 in. x 48 in. x 96 in.)

Plywood 3/16in 

http://www.homedepot.com/p/Unbranded-Underlayment-Common-7-32-in-x-4-ft-x-8-ft-Actual-0-196-in-x-48-in-x-96-in-431178/203183010        $12.97 for 8'x4' sheet

 

Allegedly 5mm “Tri Ply” underlayment from Home Depot is advertised as CARB Phase II compliant which supposedly means formaldehyde free.

 

http://www.lowes.com/pd_518477-53547-518477_4294816001__?productId=50121135&Ns=p_product_qty_sales_dollar|1&pl=1&currentURL=%3FgoToProdList%3Dtrue%26Ns%3Dp_product_qty_sales_dollar%7C1&facetInfo=     $14.48