Weight Limit Attic

Make sure items are spaced so that the weight is evenly distributed over the chords.

Weight limit attic.

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. Size of the beams supporting attic floor. It is vital to observe the weight rating and make sure that you comply with it at all times. All weight hanging from the truss has to be added to the existing dead load.

Next consult a span table to cross reference the spacing and span to find the required fb value for that table s load limits. Scrap of plywood over the chords and set about 40 lbs. A typical load is 5 and 10 pounds per square foot. Observing the weight rating.

I put the floor in about twelve years ago and can t remember. So if your ceiling is unfinished you have some excess carrying capacity up there. That means you could lay a 2 x 4 ft. If the attic has the potential to become a regular living space talk with a contractor about adding a fixed stairway.

Hard to measure since i already have a lot of stuff in the attic but i think that they are about 24 ft long. Is a safe estimate. 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. 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.

An uninhabitable attic not designed for storage can handle a 10 pounds per square foot live load. Access to attic storage. Length of the beams. The joists are what support the weight.

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. Of stuff on it. I m guessing you don t have the plans and don t know what live load the attic was designed for. In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches.