Two of the biggest trade expositions in residential construction — the International Builders’ Show (IBS) and the Kitchen & Bath Industry Show (KBIS) — will join forces next year. IBS and KBIS both will hold their 2014 shows in Las Vegas on Feb. 4–6. And in 2015, they’ll be joined by the Surfaces show for floor coverings and by StonExpo/Marmomacc Americas for the natural stone industry.