[RE-wrenches] roof noise after solar install.

[Ken Schaal]

Interesting issue and another reason to be grateful for this list-------

As an old thermal wrench that has had to do too many collector remounts for 
re-roofing, and have no desire to see this happen with PV--Well, the horse 
is out of the barn, isn't it?-- we take appropriate measures to avoid re- 
roof remounts. One such measure recently done on an older roof in excellent 
condition, for a 15' x 22' array on a 42' long house, was to coat the 
shingles with aluminum asphalt, Karnak #97, which greatly reduces heating of 
the roof shingles, deck, attic, air handler/ductwork, and rooms  below. Now 
I realize that this may provide a degree of  insurance to prevent 
expensive--aren't they all ! -- callbacks. Granted it's not a solution for 
all esthetic situations, but it actually came out looking pretty good. Most 
folks seeing it for the first time thought it looked more white to 
blue-white, as it reflects the sky color.Keeps the second floor in this 1 
1/2 story Cape a lot cooler too !

Also should extend the life of the shingles, indefinitely if recoated every 
10 years. So no remount for my successors-----they'll have to earn their 
keep with new panels!

And Dr Cho approves,  I'm certain !

Stay out of the Hot Sun

Ken

----- Original Message ----- 
From: "Darryl Thayer" <daryl_solar at yahoo.com>
To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
Sent: Monday, August 30, 2010 2:59 PM
Subject: Re: [RE-wrenches] roof noise after solar install.


Thanks Dan
this is what I fear that it is differential expansion of the roof itself 
because I have no easy fix. Any one know of a sound camera?

--- On Mon, 8/30/10, Exeltech <exeltech at yahoo.com> wrote:

> From: Exeltech <exeltech at yahoo.com>
> Subject: Re: [RE-wrenches] roof noise after solar install.
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Monday, August 30, 2010, 1:47 PM
> Darryl,
>
> The problem can also be caused by uneven heating of the
> roof. I lived in an off-grid house for eight
> years. It too suffered creaks and groans such as you
> describe, but mostly on warm, sunny days. Noise wasn't
> a problem during the winter or in cloudy weather. The
> issue was resolved when the PV were moved off the roof and
> put on pole-mounts (for reasons other than the noise
> issue.) We know it was roof temperature and not the
> racking because on close scrutiny over many weeks, we found
> the noise originated in areas of the roof exposed to the
> sun, away from the PV. Loosening the PV clamps and
> letting the PV free-float on the racking had no effect on
> the noise. Shading the exposed areas of the roof with
> large flats of cardboard and all was quiet again.
>
> Just one more data point. Hope this helps...
>
> Dan
>
> --- On Mon, 8/30/10, Darryl Thayer <daryl_solar at yahoo.com>
> wrote:
>
> From: Darryl Thayer <daryl_solar at yahoo.com>
> Subject: Re: [RE-wrenches] roof noise after solar install.
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Monday, August 30, 2010, 1:23 PM
>
> This was built at one time, but on Tuesday I am going to
> the site,
> and I will look very carefully at the structure.
>
>
>
>
>
>
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