Adding Floor Joists. Nailing two 2x4s together will work to span about three joists unless the sag is under a weight-bearing wall. Jacking them up too fast may cause cracks in the walls and floors overhead.
Standard joist spacing for the installation of attic flooring materials is 16 inches on center OC meaning the distance from the center of one joist to the center of the next joist is 16 inches. Worse if a gap exists between joist and subfloor the floor may still flex. When stabilizing your floor joists with a beam youll want to support it with appropriately-sized columns and footings.
Standard joist spacing for the installation of attic flooring materials is 16 inches on center OC meaning the distance from the center of one joist to the center of the next joist is 16 inches.
When stabilizing your floor joists with a beam youll want to support it with appropriately-sized columns and footings. Doesnt interfere with plumbing or wiring in joist bays. Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load-bearing capacity of a floor. Thats a big size and strength difference between the two types of framing even if the joist spacing is the same.
