[RE-wrenches] roof noise after solar install.

[Matt Lafferty]

Darryl,

No answers. Just questions in search of answers.

Is this a single-layer comp roof?
Did the noises begin immediately after the install?
Were there any questionable structural issues noted during install?
Is it possible that one or more bolts aren't completely tightened? (Take a
good look at your footing to rail connections.)
Can you get into the attic and inspect the rafters/trusses? (Make sure you
don't have a busted rafter)
What was the temperature during install compared to normal daytime highs
when it's making all this racket? (I've heard of winter-installs making
noise during the summer)
What does it sound like from outside the house? (i.e. is the pitch or tone
of the sounds very different)
Can the source of the sound be isolated to one point or region? (i.e. only
on the longest rails)
What is the temperature range like on the days it's being a nuisance? (i.e.
45-95, or 55-85, etc.)  
Are these jumbo modules? (large modules have greater absolute expansion
between attachments than smaller modules)

When you go out there, be prepared to install a pair of expansion splices
for each long rail set, but don't expect that to be the silver bullet.
Unirac says you only need them every 45 feet. If your situation is under
30', I expect you have another problem. Installation manual here:
http://www.unirac.com/pdf/ii908.pdf

Pray for silent roofs,

Matt Lafferty

From: Darryl T
Subject: [RE-wrenches] roof noise after solar install.

New roof asphalt shingle, 5.1 kW system, string inverter makes roof noises
in the morning, and afternoon particularly after dark 

Creek and crack it finally stops late at night but restarts late morning and
stops mid afternoon most days then intensifies after dark.  Timing seems to
follow temperature,  has customer freeked

Longest tun is 30 feet Unirack rail with top down clamps.  
Darryl