[Strawbale] water in attic

[Alan Abrams]

> If the bottles are arrayed upright, in a hex pattern, and each  
> bottle is 4"
> in diameter (or spaced 4" oc on the 60d grid), then you would have  
> about
> 20.5 liters / sf.  (I drink my whiskey straight, so have no softdrink
> bottles at hand to measure)  Unmixing US and furrin mensuration,  
> that's
> about 45 PSF, not counting the plastic bottles.  IRC design for attic
> storage is 20 PSF live load.

     You're assuming, though, that you pack the water in as densely  
as possible.  I'm guessing that for day-to-day temperature moderation  
you'd need a lot less than the theoretical maximum volume.  So only  
put in every third bottle in your mental diagram, and you're within  
the design load.

-Speireag.

>>>>>>>>>

Yes of course.  Many variables at play, including spans, volume of storage
desired, and convection patterns.  

It's notable too that the closer to bearing a load is placed, the less
strain it imposes on the beam (in this case, attic floor joists).  So if the
convection source is at the edges, and storage is offset accordingly, the
problem can be mitigated.  

-AA