[RE-wrenches] Hardware request

[Bob-O Schultze]

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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