Allan,
As an alternative, DP&W makes an "H" foot mount for corrugated steel
roofing. Two legs push down on the troughs and the lag goes into the
peak (where it belongs) without compressing the roof. They will custom
build them for you based on the peak to trough and trough to trough
dimensions. I've used them and they work pretty good.
Cheers, Bob-O
On Mar 26, 2009, at 11:01 PM, Allan Sindelar wrote:
Wrenches,
We have an unusual roof application. It’s for a roof-mount array on a
commuter rail station canopy in Santa Fe. The roof is made up of a
coated corrugated steel top layer, in the shape of a series of sine
waves, over roofing felt, 5/8” plywood sheathing, and a corrugated
metal base called Epicore. The array will be one long single row of
modules in portrait mode on Solarmount rails. I’m leaving out some
details in order to get to the point.
We intend to base our mounting of the rails on a through-bolt mounting
attachment, using threaded rod with the necessary nuts, washers, and
sealant layers to create a compressed sandwich approach. The
corrugated top layer has peaks and troughs of about 1½” radius. We’ll
use L-feet to mount the module rails to the through-bolts, which will
likely be made from 5/16” or 3/8” threaded rod (size to be determined
as we work out the details at the site). We will drill through the
troughs of the corrugations, rather than the peaks, to avoid
compressing the corrugated roofing; drilling the troughs has the
project engineer’s approval.
What we need is something like half-round anodized aluminum or powder-
coated steel stock material. The idea is that the convex round profile
fills the corrugated trough, and the flat surface forms a base for the
L-foot. We would expect to cut the stock to lengths, say 4-6”, drill
one hole through the center cross-section for our through-bolt, and
mount the sections in the troughs, one at each through-bolt location.
What product, likely used in some other industry or manufacturing
process, would work for our half-round stock? The job isn’t big enough
to justify a custom extrusion – we probably need two dozen of the
finished pieces.
Thank you for any ideas,
Allan Sindelar, Positive Energy
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