flat rubber roofs [RE-wrenches]

[bbassett at rockisland.com]

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Geoff,

You really should have an engineer look at the structure. I remember 
quoting a US post office job and when the engineer looked at it, he said 
the building did not meet code as is, and said he would not be surprised 
if it would collapse in the next really heavy snow (I haven't heard that 
it has yet, but maybe no heavy snow there... yet). He would not OK 
putting ANYthing on the roof. And this was a govt. building.  So I don't 
think you can assume any roof is strong enough without taking a look. 
Residential roofs are standard enough that you can probably judge it, 
but maybe not commercial roofs.

Brad
AEE 


geoff at third-sun.com wrote:
> 
> I have a project with a flat rubber roof on an older townhouse style 3 
> story
> apt. building. shading etc wants to put our PV all in one spot... trying 
> to
> rack 21 evergreen panels at 26 degrees... (flexible on that)  My initial
> idea is to do a conventional tilted mounting system attached to some 
> wooden
> curbs that I would have flashed and "roofed" onto the existing roof by a
> sub.  The quotes are coming in surprisingly high ($4-5K for (6) 8' 
> curbs).
> Is this normal? I actually do have access to the 2x12s from below - I 
> could
> probably put in blocking and use single point standoffs - would this be 
> a
> less expensive approach?  Maybe I should look at a ballasted approach?  
> I
> have thought of hefting some pre-cast concrete lintels or parking curbs 
> up
> there and using masonry fasteners to attach to them but I certainly 
> don't
> want to rough guess the required weight...How would YOU do it?
> 
> For a brighter energy future,
> 
> Geoff Greenfield
> NABCEP Certified Energy Practitioner
> 
> THIRD SUN SOLAR & WIND POWER Ltd.
> 340 West State Street
> Athens, OH 45701
> 
> www.third-sun.com
> (740) 597-3111
> 

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