Roof mounting [RE-wrenches]

[graham at solarexpert.com]

Wrenches,

FastJack mounts are all 3/4" in diameter (solid machined aluminum).  For 
most comp-shingle roofs we use 4.5” FastJacks with American Metals 
flashings.  The best place to get flashings is from a plumbing warehouse 
and they should cost less than $2.75 each. For re-roof applications on 
sloped roofs with a desired lower solar array profile 3” FastJacks with 
Oatey-Solar (EPDM rubber) flashings work well.  For flat roofs do not 
use the rubber flashings only metal.  If the roof has a layer of 
insulation on top of the sheathing use longer FastJacks, they come in at 
least 4 different lengths.  I like to have at least a half an inch of 
the Fast Jack mount sticking up above the top of the flashing.

I have seen some cheap 3/4" flashings that do not seal well around a 
3/4" post and the base hangs up on the mounts and will not rest flush.  
My recommendation is to either use Oatey or American Metals.  Many 
plumbing warehouses only keep a few dozen 3/4" flashings in stock so it 
is best to order a hundred or more a couple of weeks before they are 
needed.  Professional Solar is also a distributor for Oatey Flashings so 
you can order them with the FastJack mounts.

Graham Owen
GO Solar Company

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