Attic Storage Load 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. Of floor area dead load on second floor 20 lbs. Access to attic storage.

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Design live loads will vary based on a number of factors but at a minimum 10 psf live load for attics without storage 20 psf live load with limited storage and 30 psf for habitable attics.

Attic storage load limit.

Of floor area dead load of partitions 20 lbs. Make sure items are spaced so that the weight is evenly distributed over the chords. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of other elements in the load path. So if your ceiling is unfinished you have some excess carrying capacity up there.

To simplify you can place 20 pounds of dead load per square foot on your subfloor as long it s supported mid span. That means you could lay a 2 x 4 ft. Dead load of attic floor when floored 20 lbs. Dead load of first floor ceiling plastered 20 lbs.

Is a safe estimate. Of stuff on it. Your allowed weight and span for a 2 x8 x12 2btr hem fir based on the info you have provided is 20 psf of dead load and 30 psf of live load with minimum bearing length of 0 68. 2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes.

If the attic has the potential to become a regular living space talk with a contractor about adding a fixed stairway. Scrap of plywood over the chords and set about 40 lbs. Dead load of first floor ceiling not plastered 10 lbs. Live load on second floor local requirements.

Storage space dead load of partitions 20 lbs.

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