4300 DimenIn addition to the Aluminum Brackets, Meadow Burke also provides a 5.50 inch high Aluminum Joist to reduce the overall weight of the assembled overhang system. As a result of the joist material being aluminum, instead of wood, the joist spacing will be greater and installation costs lower. It is available in 18, 21, and 24 foot lengths. HF-91 clamps are available which secure the HF-92 joist beam to the Aluminum Brackets. The HF-92 joist beam has a nailer insert so the installation of the plywood is as fast as usual.