flat mount dilemma [RE-wrenches]

Tom Lane, Energy Conservation Services tom at ecs-solar.com
Mon Jun 2 05:59:32 PDT 2003


THE MINIMUM TILT TO WASH DIRT OF WITH RAIN IS 15 DEGREES .   -GATOR TOM----
Original Message -----
From: "Robert Warren" <robertwarren at mail.com>
To: <RE-wrenches at topica.com>
Sent: Monday, June 02, 2003 2:33 AM
Subject: RE: flat mount dilemma [RE-wrenches]


> Keith,
>  Take a look at the specifications from Schott on their FS system. This
> is a flat roof-ballasting method of installing the glass/glass modules,
> which are a lot heavier than normal modules.
>  They are only a 5 degree tilt for rain runoff, and eleiminating wind
> uplift. Considering you are in Hawaii, 5 Degrees should be fine. I am
> not familiar with the type of roofing material called rooled brie. Is
> this soft like Brie cheese? If that was the case, you would definately
> want something structural in the waay of a supporting grid. But with no
> access, you are pretty much stuck to a ballast method. There is one
> other ballast method, with what looks like black polyetheylene mounting
> trays. They can be used at either a 30 degree or a 60 degree angle, and
> you fill the inside of these pans with concrete blocks or gravel. They
> are called Intersols, I think, but I only know about them being sold in
> England. I don't know if anyone has them over there.
> Robert Warren
>
> Darryl Thayer wrote:
> >
> > 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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>
> What will we do if there is another fuel shortage?
> Did you know that there is a pollution free, completely
> renewable fuel which you can use right now in your own car?
> Don't replace the engine, replace the fuel.
> Check out my website on making your own fuel:
> http://running_on_alcohol.tripod.com
> robertwarren at mail.com
>
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