Flex Base & Road Base Type A Grade 1, 2, 3, 5 Base 1 3/4″ TxDOT #247 tested base and flexbase material most often used for roads, parking lots, commercial building pads, and construction foundations. Get Pricing Non-spec Base 2 1/2″ crushed limestone base material typically used for driveways, parking surfaces, and commercial building pads that require crushed limestone or Type A Grade 3 select fill. Get Pricing Contact us for a free consultation today... Contact