Argonne European Oak engineered hardwood floor by Monarch Plank Hardwood Flooring. Experience natural beauty of European Oak sourced from responsibly managed forests in Europe and the U.S., with use of the most eco-friendly adhesives and finishes available. Argonne European Oak of Domaine collection smooth texture and rustic grade dark smoked wood. Dry-sawn 6 mm tick top layer. Argonne European Oak Domaine Collection by Monarch Plank hardwood flooring made with a formaldehyde-free adhesive (EPI), contains no added formaldehyde of any kind CARB ATCM Phase II Compliant. Lifetime structural, 25-yr finish warranty.