My builder framed the joist opening, but wouldn’t install. Feared liability. I installed myself. Only comment is that I wish I instructions had been more clear about necessary clearance for Antrieb mechanism. Screwdriver: Both a Phillips and a flat-head screwdriver will be necessary for driving screws and fasteners. The E-Z https://attic-lift20874.eqnextwiki.com/4984790/wenig_bekannte_fakten_über_attic_lift_kit