HDPOCKETDOORS heavy duty pocket door frame for standard 2x4 walls. The 3500-325 series features an upgraded track and hardware that will easily carry heavy solid core doors weighing over 150 lbs up to 325 lbs, universal T floor guide, a manufactured LVL header that will stay straight and flat and 16 gauge ¾" x 1½" steel posts for added strength and stability. The LVL header is fully assembled including the top bracket so that the steel posts along with the bottom brackets can easily be snapped into place for a quick and easy installation. We recommend a solid core door with a maximum 1 3/8" door thickness in the 3500 series for proper clearance inside the pocket.