Weight Limit Attic
Scrap of plywood over the chords and set about 40 lbs.
Weight limit attic. Is a safe estimate. If you want to use your attic on a regular basis or to store large items you may need to enlarge the access opening and install an access ladder or drop down stairs. Access to attic storage. An uninhabitable attic designed for limited storage can handle 20 pounds per square foot live load.
An uninhabitable attic not designed for storage can handle a 10 pounds per square foot live load. Spacing between each beam is 14 4. The joists are what support the weight. All weight hanging from the truss has to be added to the existing dead load.
It is vital to observe the weight rating and make sure that you comply with it at all times. Length of the beams. Of stuff on it. If the attic has the potential to become a regular living space talk with a contractor about adding a fixed stairway.
Observing the weight rating. This is because the ladder is simply not strong enough to support any more weight and you are putting unreasonable pressure on the attic access ladders every time you break the weight limit. That means you could lay a 2 x 4 ft. A typical load is 5 and 10 pounds per square foot.
Next consult a span table to cross reference the spacing and span to find the required fb value for that table s load limits. The span table for a 30 psf live load 10psf dead load floor indicates a required fb value of 1 315 and a minimum e value of 1 800 000. Make sure items are spaced so that the weight is evenly distributed over the chords. I m guessing you don t have the plans and don t know what live load the attic was designed for.
If the total weight exceeds the load limit of the truss then the truss is compromised. In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches. I put the floor in about twelve years ago and can t remember. The dead load on the bottom chord of a truss varies with the weight of materials attached to it such as drywall on the ceiling.