Armstrong to Add Third Shift, 108 Workers in Warren by Arkansas Business Staff Posted 2/7/2013 04:22 pm Updated 3 years ago Armstrong Floor Products said Thursday that it will add a third shift to its plant in Warren, citing increasing demand for its hardwood flooring products. Want the Full Article? Get Unlimited Archive Access for $19.95 per Year Readers must pay to access stories older than 20 days. Purchase Now Already have archive access? Login to view this article.