Ultimate Axial Load

Sounds a tad heavy.

.........................DL LL

Roof ................. 80 15

Second Floor..... 120 40

First Floor ........ 120 40

DL + LL ........... 320 95

Load factor...... 1.25 1.5

Factored Load .. 400 142

Total factored load = 542 psf for two floors and a roof.

To arrive at a factored load of 610 kips, you would need a tributary area of 610,000/542 = 1125 square feet (33.5 feet square). Seems a bit large for a residence.

hi ba/el,

Thanks mate.

I just noticed maybe my loading (dead loads) on floor framing is too high for a residence.

Could you recommend me an estimated or normally DL for the flr framing?

regards

jaypro

Depends on the floor or roof system you are using. Concrete weighs approximately 150 pounds per cubic foot, so a 6" slab is about 75 psf. A dead load of 120 psf would correspond to a 10" thick solid slab.

If you are using a system of concrete joists, you have to calculate the volume of concrete per square foot and multiply by 150. It ain't rocket science.

Hi Mate,

You're right.

Thanks again for the info.

Dear jaypro. The 80 psf roof dead load seems high. There is insufficient information to be sure but a typical asphalt shingled roof with one layer of felt, 19/32" roof sheathing, roof trusses and a gyp. ceiling would weigh somewhere in the neighborhood of 20 to 25 psf. The second floor would be similar. The ground floor (above crawl space would be similar). Again, it all depends on the material and construction of the roof/floors. For example, a marble floor would weigh much more than a carpeted floor. A clay tile roof would weight more than an asphalt shingled roof.