78 in. (6.5 ft.) x 61.5 ft. (400 sq. ft.) DamPro XL Waterproof Moisture Barrier Foundation Wrap/Floor Underlayment ULM-06-BLK66 - The Home Depot
Choosing the right type of underlay for your new flooring
FloorComfort 4-ft W x 25-ft L x 5 T Premium Foam Moisture Resistant Flooring Underlayment (100-sq ft / (Fan fold) in the Flooring Underlayment department at Lowes.com
What is a Moisture Barrier and When is it Needed for Flooring? - Flooring Inc
ROBERTS 70-115 Moisture Barricade Underlayment Film, For Laminate Floors, 6 Mil. Thick Polyethylene, Black ,120 Sq. Foot Roll - Amazon.com
WhisperMat-CS Acoustic Underlayment for Stone & Tile Floors