The horizontal bottom chords of most garage trusses are designed to carry the weight of drywall and insulation. So if your ceiling is unfinished, you have some excess carrying capacity up there: 5 lbs. per sq. ft. is a safe estimate.Click to see full answer. In respect to this, how much weight can a 2×4 joist hold?If there is no strong wind, a 2×4 measuring at least 8 feet can support at least 1,000 pounds vertically. Such calculations would hold if, for instance, the load is square.One may also ask, how much weight can you hang from a joist? If you spread the weight across 3 joists, that puts only 100 lbs per joist (very doable). If you are worried about any potential sagging, you can further spread the weight across 2 bolts per joist, that is only 50 lbs per bolt (very doable). Hereof, how much weight can a truss roof hold? Typical Loads If the bottom chord of a roof truss functions as a floor joist, such as in an attic room, it carries a live load that also varies by use, but a typical live floor load for a residential space is about 40 pounds per square foot.How much weight can a 2×6 Rafter hold?The type of load in question will also determine how much weight a 2×6 can hold on edge. For example, a 2×4 lumber may hold a 4-cylinder engine comfortably but may not hold a bigger one. On the other end, a 2×6 can support a V8 engine of between 600 – 700 lbs.