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Oh No!
http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10101&t=51559		 Page 1 of 1
Author:  Mike Baker [ Mon Feb 04, 2019 4:41 pm ]
Post subject:  Oh No!
I have waited all year for winter so that humidity in my home would drop to levels suitable for joining and bracing the top and back. I have glued most of the soundboard braces on at around 40% for the last 4 days. Today I glued the last brace on the soundboard this morning around 10:30, at 40% RH.
Temps outside have risen to 60F since then, and it is a beautiful day. So beautiful in fact, that my wife opened the front door to let a little fresh air and sunshine in.
I did not even think of this; but I was gluing the back graft to the underside of the back, and happened to glance at my hygrometer. 60% RH. gaah
I don't know if that swing since I glued that last tone bar on will cause issues down the road, but it is done, and I can't undo it.
Hopefully night time temps will kick my furnace back into action and lower RH so I can glue up the back braces. They are ready to go, Just have to wait on the back graft to dry.
A question related to this; can I shape braces at 60% humidity, or will I need to wait for humidity to steady down a few days before?
Thanks.
Author:  WudWerkr [ Mon Feb 04, 2019 4:48 pm ]
Post subject:  Re: Oh No!
I don't think you will have much issue with it . Prolonged Higher % might have been, however the time frame your talking about was relatively short . Just my .02 worth
Author:  Bryan Bear [ Mon Feb 04, 2019 4:57 pm ]
Post subject:  Re: Oh No!
Once you get the humidity down again, I would let the braced top set at that RH for a while so it can equilibrate, then glue it to the rim at close to the same RH as you braced it.
Author:  DennisK [ Mon Feb 04, 2019 4:59 pm ]
Post subject:  Re: Oh No!
Yeah, my humidity has been all over the place this past week, with the outdoor temperature going from sub-zero to 60+ degrees in a few days...

The back seam reinforcement is so narrow and thin, it's unlikely to cause any problems. But do wait before gluing back braces.

Humidity is irrelevant when carving.
Author:  Mike Baker [ Mon Feb 04, 2019 5:03 pm ]
Post subject:  Re: Oh No!
Thanks gentlemen. Very much appreciated.
What about carving the braces? Can I carve them once the glue has dried, so they will be ready when the humidity settles down, or should I wait?
Author:  meddlingfool [ Mon Feb 04, 2019 5:40 pm ]
Post subject:  Re: Oh No!
Carve braces at whatever humidity you like...
Author:  Mike Baker [ Mon Feb 04, 2019 5:48 pm ]
Post subject:  Re: Oh No!
Thanks, Ed!
Author:  Mike Baker [ Mon Feb 04, 2019 6:25 pm ]
Post subject:  Re: Oh No!
We closed the door. Everyone got mad at me. Oh well, what can you do?
I put a fan in there running on medium. The room is 10' x 10', and it is already down to 48% RH. Now I need to let it be for a bit.
Thanks for all of the advice.
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