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 motor mechanism. Telescoping ladders are great if you don't have much space to store a regular ladder. They can adjust https://atticliftkit08652.thebindingwiki.com/8227253/wenig_bekannte_fakten_über_attic_storage_lift_solutions