What are the "safe" parameters for shop humidity?

[Erwinspiano@aol.com]

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In a message dated 8/21/2003 3:56:50 AM Pacific Daylight Time, 
mfarrel2@tampabay.rr.com writes:

> Subj: Re: What are the "safe" parameters for shop humidity? 
>  Date: 8/21/2003 3:56:50 AM Pacific Daylight Time
>  From: <A HREF="mailto:mfarrel2@tampabay.rr.com">mfarrel2@tampabay.rr.com</A>
>  Reply-to: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
>  To: <A HREF="mailto:pianotech@ptg.org">pianotech@ptg.org</A>
>  Sent from the Internet 
> 
>               In Calif heartland we rarely have these troubles. No brag just 
> fact?? 

      Dale

> 
> IMHO, good humidity control is critical. I would say that anything between 
> 40% and 50% would be excellent and constant RH is perhaps more critical than 
> any particular level. At 60,000 sq ft., I'm sure you can run down to Sears and 
> pick up a suitable dehumidifier for about $435,000. OR, you may wish to 
> consider partitioning off a unit in the 1,000 to 2,000 sq ft. range (or whatever 
> size you need) and go for the $150 variety humidity control device! I 
> wouldn't take much to partition off - a bunch of 2x4s (or maybe even smaller?) and 
> plastic or foil-backed foam insulation and you'd be good to go.
> 
> I keep my shop right between about 45% and 48% RH (little Sears 
> basement-type dehumidifier in 950 sq. ft. shop) and keep at least a six-month to year 
> supply of wood (maple, spruce, etc. - actually I likely have several years worth 
> of most wood). It is a very comfortable feeling to know that all the wood 
> that I put into pianos is going to be very stable and I don't have to worry 
> about dimensional changes, warping, etc.
> 
> Terry Farrell
>  


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