[RE-wrenches] roof noise after solar install.

[Darryl Thayer]

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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