) are higher on the session by 0.86%, currently trading at $42.40. The stock has been moving largely lower over the past six weeks and is currently trading below the 200-day moving average. Options traders are buying puts on the name today. A short while ago the August 2011 $40.00 put traded 1,000 times on open interest of 0 contracts. Overall put volume is now running at 8.45x the daily average with 100% of all puts traded being purchases on the offer. Armstrong World Industries, Inc. is a global producer of flooring products and ceiling systems for use primarily in the construction and renovation of residential, commercial and institutional buildings.