That depends entirely on the physical characteristics and construction of the lumber. There is simply no way of answering this question without more info. A two-by-four (2x4) will support more weight than a similarly loaded one-by-three (1x3). A 2x4 will support a greater load on its two-inch face than on its four-inch face.
4.5 kgDepends
A 2x6 piece of lumber can typically support around 50 pounds per linear foot when used as a horizontal shelf. The actual weight it can hold will depend on various factors such as the type of wood, the length of the span, and the load distribution. It is always best to consult with an engineer or construction professional for specific load-bearing calculations.
Without knowing how the roof was constructed and with what dimension of lumber or steel, there is no way to estimate.
49 pounds
See if they have a weight limit and know about how much your funrniture weighs. You will want to be sure they are metal in most case to hold the weight.
19 5/8 inches
112lbs
How much a surgery on lumber L4 L5
it can hold as much weight as it can handle
it can hold up to 2 gallons
Paper can hold exactly 4.5 kg
2.3lbs