Typical home attic load limits?

[mnormand]

Good morning:

Can I ask some of you experts to tell me what a typical range of attic load limit might be? I certainly realize this is pretty wide open regarding design, home fab materials, etc. Just imagine a wood frame home, one story, typical attic, etc. etc. I have no idea what might be reasonable... 10psi, 10psf, 500psi, 500psf????

Just a rough range would be appreciated very much.
Regards to the forum,
Mark

 

[CJJS]

In my area, roof trusses are designed for 10psf dead load. The code requires that the truss bottom chords be designed for 20psf LL additional to the DL, if the web configuration of two or more adjacent trusses allows a 24" x 42" box to pass through it.

 

[boo1]

Residential Dwelling:
Attic with storage 30 psf LL
Attic with out storage 10 psf LL

 

[MiketheEngineer]

The first two responses are quite on the mark..

HOWEVER - if you are building new and wish higher loads - get with the truss fabricator and decide what you need.

 

[boo1]

If its new construction, just specify attic storage trusses to the fabricator (agree w Mike). CJ brings up a good point about wider width 24" vs 22 1/2" pull down stairs, this must be specified to the fabricator for design and layout (truss spacing is changed from 24" OC to 26" OC for the bigger stairs).

 

[mnormand]

Thx for all the input.
That was exactly what I was looking for.

Regards to all,
Mark