The size of the ridge beam needed to span a 28 foot should be 18 inches deep and 8 inches wide. What size ridge beam do i need for a 28-foot span So, you would need something like 4-2″×14″ size of wood ridge beam or 3-1/2″×11-7/8″ size of engineered lumber (LVL, Glulam) for a 20 foot span used for residential application. The size of the ridge beam needed to span a 20 foot should be 14 inches deep and 8 inches wide. What size ridge beam do i need for a 20-foot span So, you would need something like 4-2″×16″ size of wood ridge beam or 3-1/2″×16″ size of engineered lumber (LVL, Glulam) for a 24 foot span used for residential application. The size of the ridge beam needed to span a 24 foot should be 16 inches deep and 8 inches wide. What size ridge beam do i need for a 24-foot span In addition, the size of ridge beam needed to span a 12-foot should be 2-2″×12″ lumber, while the size of ridge beam needed to span a 10-foot should be 2-2″×10″ lumber. Likewise, the size of ridge beam needed to span a 18-foot should be 4-2″×12″ lumber, while the size of ridge beam needed to span a 16-foot should be 3-2″×12″ lumber. In general, the size of ridge beam needed to span a 30-foot should be 4-2″×20″ lumber, while the size of ridge beam needed to span a 24-foot should be 4-2″×16″ lumber. For a 30 foot span:- The size of a ridge beam for a 30-foot span need to be 4-2×20 dimensional lumber or wood or 5-1/4″×16″ Glulam or LVL.For a 28 foot span:- The size of a ridge beam for a 28-foot span need to be 4-2×18 dimensional lumber or wood or 5-1/4″×14″ Glulam or LVL.
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