LWB is a Basic Insulated Attic Ladder suitable for garage or home with insulated attic space. All FAKRO attic ladders are pre-assembled and include the frame, hardware and the ladder. This video shows installation procedures in a framed rough opening. Model LWB was introduced in 2020 to replace non-insulated model LWN. Insulated door and perimeter rubber gasket allowed to achieve thermal insulation of R 3.7.