[CAUT] Backcovers?

[Cy Shuster]

Yes, in fact I was part of a controlled before-and-after test.  We  
measured RH swings with a data logger for a week in winter on a C3  
(grand) with a full DC system, then added the undercover and measured  
again.  The range of humidity high/low points was reduced by about a  
third.  I don't remember the exact numbers, but for example if the  
system before was controlling humidity within a 30% range (+/- 15%) it  
improved to a 20% range (+/- 10%).

It's easy to install backcovers on uprights with Mark Cramer's idea of  
heat-activated hemming tape.  Essentially it's just a strip of hot  
glue with paper on one side.  You iron it on, let it cool, pull off  
the paper, tack on the cover with excess on the sides and bottom, iron  
it in place, and then trim to fit.  I have pictures of an installation  
I did yesterday if there's interest.

The Dampp-Chaser covers are like speaker cloth, and breathe.  An added  
benefit for grands is that it keeps kids and animals from getting into  
the system.

--Cy--

Cy Shuster, RPT
Albuquerque, NM

www.shusterpiano.com
www.facebook.com/shusterpiano

On Sep 22, 2010, at 5:32 AM, Diane Hofstetter wrote:

> Well, I was really proud last spring (pride goes before a fall), to  
> seem to have those 9 Kawai UST-9's finally stable.   Wrong!  When I  
> went to tune there this past weekend, the relative humidity was in  
> the 70%  range, three of the DamppChasers were unplugged.  The stage  
> manager was complaining about one of the curtains, which is 5" above  
> the floor level (up from 1"), due to the RH.   The pianos were  
> around 25 cents sharp at the low end of the treble bridge.  The RH  
> inside the pianos with working DC's was in the 60% range.   The  
> pianos I tuned the week before sounded awful.
>
> I think I should try back covers.   Does anyone have any experience  
> with them?  I have used heavy duty plastic on the backs of numerous  
> pianos, but never any of the professional covers.  Thank you for  
> recommendations!
>
> Diane Hofstetter
>
>

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