Attic Wieght Limit

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. So if your ceiling is unfinished you have some excess carrying capacity up there. Make sure items are spaced so that the weight is evenly distributed over the chords.

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The joists are what support the weight.

Attic wieght limit.

If the total weight exceeds the load limit of the truss then the truss is compromised. Access to attic storage. 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. Next consult a span table to cross reference the spacing and span to find the required fb value for that table s load limits.

That means you could lay a 2 x 4 ft. I m guessing you don t have the plans and don t know what live load the attic was designed for. A typical load is 5 and 10 pounds per square foot. All weight hanging from the truss has to be added to the existing dead load.

Of stuff on it. A person might think that going by the 10 lbs psf limit that he could safely put 270 lbs on a 4x8 sheet of plywood 270 50 lb sheet of plywood 320 lbs or 10 lbs sf if you weigh 250 that means you could safely have 20 lbs up there with you on one sheet of plywood. Scrap of plywood over the chords and set about 40 lbs. 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.

In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches. An uninhabitable attic designed for limited storage can handle 20 pounds per square foot live load. If the attic has the potential to become a regular living space talk with a contractor about adding a fixed stairway. Is a safe estimate.

An uninhabitable attic not designed for storage can handle a 10 pounds per square foot live load.

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