What room RH = 4%MC?

[Farrell]

No. MC depends on both temperature and RH.

Bill Spurlock has an excellent paper: Router Repair of Soundboard Cracks  
which can be found at:  http://www.spurlocktools.com/id36.htm
His paper does a good job explaining soundboard drying for shimming.

Terry Farrell

----- Original Message ----- 
>    As RH calculations already incorporate a
> temperature factor, wouldn't that be redundant?
>     G
> 
> --- Farrell <mfarrel2 at tampabay.rr.com> wrote:
> 
>> Wood MC depends on BOTH the temperature and the RH.
>> Although for shimming, 
>> I'm not sure it really matters. I think the target
>> is to dry it down enough 
>> so that the cracks enlarge - then shim to your
>> heart's content.
>> 
>> Terry Farrell
>> 
>> ----- Original Message ----- 
>> > I'm doing my board work/refinishing in a little
>> > aluminum "Handi-House", in the backyard, with
>> > dehumidifier installed. Is 4% MC good for crack
>> > shimming ? What RH would that be, or what would
>> you
>> > recommend?
>> >     Thanks!
>> >     G