Profile: Straight-Line Construction specializes in providing tools for construction and building industry. Our products include helical & resistance piers, pre construction piers, micro piles, soil nails & tie backs and compaction grouting & mud jacking. Mud jacking is used for leveling of sunken concrete slabs with a low-strength grout. Helical piers are rotary-driven piers that are driven to a competent bearing strata to transfer load from the surface to the stable strata below (average 21 feet).