flat mount dilemma [RE-wrenches]

[Daryl Thayer]

Hello 
I have ideas and some flat roof experience, however I
am far from an expert. 

When I think flat roof I think ballast pans.  I favor
a flatter array than optimal to keep the array lower
to the roof.  Can you even lay the array on the roof
to prevent wind uplift?  If the ballast pans are
placed on styrofoam to prevent sharp edge effects and
the load is kept to less than 20 pounds per square
foot on the pan/pad?  I usually design for a maximum
uplift of 15 lbs./sq.ft. on the array.  Here in
Minnesota we have to keep the array fairly vertical,
where you are I do not know how to calculate wind
forces because the array is so flat.  Some one with
aero experience should help.  

Daryl  

--- keith <kcronin at lava.net> wrote:
> Hello
> 
> I am looking at a pv project with a flat roof.  It
> is rolled brie with
> plywood underlayment.  It sits on z bar purlings. 
> Inside the building
> is a 1'x1' spline tile ceiling with zero access.  I
> am wondering about
> the best method for mounting racking without
> compressing the roofing
> material and creating more burden on the roof. I
> would desire to bolt it
> thru to the z bar, but it is impossible.  I have
> engaged a few roofers
> and they all had a different approach.  I personally
> would like to mount
> thru to the z purlings.  I am not sure about the
> strength and tear of
> these stainless steel self tapping screws.  I assume
> you need to pre
> drill to get them started.
> 
> I was considering using Pro Solar Products roof jack
> or a similar stand
> off product and have each one hot patched by a
> roofer because I don't
> always feel comfortable with the standard roof
> conduit penetration boot
> methodology, especially on a flat roof where water
> can pool. 
> 
> Any thoughts on this pursuit?
> 
> Keith Cronin
> Island Energy Solutions
> 318 A Kuulei Road
> Kailua, Hawaii 96734
> 808-262-3268 Tel
> 808-263-0338 Fax
> www.islandenergy.net
> 
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