Hi Jay
I have experience with similar structures. Is this a Monolithic Dome? Key
Dome?
In any case, with 2.5 " of concrete, it almost certainly has welded wire or
rebar or both embedded, so you have lots of strength. Just need to get lucky
when you drill holes to miss the metal. No need to go deeper than 2", if the
previous is so. You're on the right track with epoxy filled so you maintain
water tightness.
What is the coating on the exterior concrete?
Ken at commonwealthsolar.com
----- Original Message -----
From: "jay peltz" <j...@asis.com>
To: <k...@northwindre.com>; "RE-wrenches"
<re-wrenches@lists.re-wrenches.org>
Sent: Wednesday, February 11, 2009 10:36 AM
Subject: Re: [RE-wrenches] anchoring racks to concrete roof
Hi Guys,
This mount install is not on a flat roof, well a few hundred sq feet are,
but mostly on some tilt.
Also they do get hurricanes there, so not sure how well the ballasted
work in that high of wind.
As to the construction, not of my choice anyway. I've never see in here
in the US but in MX or Baja at least its common.
Quicker than standard blocks and lots of insulation in the middle.
So I think I really looking at in concrete anchors, and am leaning
towards epoxy style.
Thanks,
jay
On Feb 11, 2009, at 6:11 AM, Karl Schwingel wrote:
Hi Jay,
not having any experience with these roofs (what a weird way to build a
roof) if you're doing a flat or near flat mount, I'd look at the
currrent issue of Solar professional magazine. lots on flat roof
mounts.
Ballasted is probably going to be your best bet.
if a high tilt (hot water system? ) I'd recommend either core drilling
thru the concrete/foam sandwich and bolting a pipe leg to the bar truss
underneath. then have a roofer (roofer of record if you can find them)
or a roofer with experience with that roofing system flash the pipe
legs.
I'm mostly hot water, and so deal with higher tilts and wind loads than
most of you lucky PV guys.
Karl
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