Isn’t the 100 PSF LL from ASCE 7 tbl 4.1 on the roof garden not included in the effective seismic weight, wouldn’t the seismic weight just be the actual weight of the soil and plants etc…?
> This is a dead load, the fact that it is a 100psf, more or less, should
> not trigger reductions in seismic mass.
>
> They have garden roofs that are low profile (work in 3"-4" of soil) that
> weigh less than 35 psf when saturated.
>
> -gm
>
>
> On Feb 17, 2008 11:36 AM, Szuchuan Chang <szuchuan@gmail.com> wrote:
>
> > I was reading about the ASCE 7 Table 4-1 about the minimum roof loads.
> >
> > "Roofs used for roof gardens .." 100 psf on page 13 of the book.
> >
> > Hope that you have not miss this requirement.
> >
> > //=====
> >
> > In order to meet the LEED requirements (to get a SILVER) our project
> > manager insisting on adding a garden on the roof. In a SDC of "E"
> > building. In San Jose area near the bay.
> >
> > Loads 100 psf are not reduceable for seismic design. How long will it
> > be for the building owner to recover the cost of adding extera lateral
> > capacity for a grarden on roof in Bay Area?
> >
> > Szuchuan