May I ask a silly question?
How do they wash the windows?
A building that size almost certainly already has provisions for mobile scaffolding. Maybe you can work off that.
well, i'm guessing that it is not an office building... not often they let you run
a rack up the outside of one of those... looks sub attractive... so i'm guessing
it's a high bay somewhere.....
i've done high bay on a zoom boom with 100' of stick.... once you get the
racking set, i set a block and tackle at the top, and pull the stuff up a stick
at a time... if it's ridgid conduit, i make a coupling with a swivel on it, spin it
on the pipe, and haul it up, then spin the pipe up tight, strap it, and take the
coupling off, and repeat... it sounds slow, but trying to put pipe in the bucket,
you can't put much in, and you spend all your time going up and down...
when i was doing this, it was (8) 4" GRC, up the side of a coker in a refinery.
tried it both ways. block and tackle worked better, and went faster.
and as someone said, it takes a special person. i like high work, personally.
people normally don't want to do it, so if you do, they are happy, give you
whatever you need to do it, and leave you alone to do it, and are just happy
to have it done.
i've done bosuns chairs, once. no choice... pipe run under a pier, 50' above
the water. not fun. doing it up the side of a building? i'd love to help, but
i'm busy that week... sorry.