Evp Underlayment . Our subcontractors installed about 700sq ft of coreluxe engineered vinyl plank flooring in 4 bedrooms and 2 wet areas (children's sinks). 1st a 6 or 9 mil plastic vapor barrier is. CoreLuxe Ultra 8mm Carbon Graphite EVP Lumber Liquidators Flooring Co. from www.lumberliquidators.ca One thing is certain with underlayment and vinyl plank flooring, though, and that's the fact that when it's recommended, it must be thin and it must be dense. The main difference between a luxury vinyl plank (lvp) and an engineered vinyl plank (evp) is the core materials and durability. Coreluxe ultra 7mm+pad brazilian cherry engineered vinyl plank flooring.