Taylor 110 CE Intonation Issue

[David Edward Helmer]

Hey everyone. I set up two guitars for my friend, a Japan Strat (really nice guitar too) and a Taylor 110 CE. Everything has gone just fine but the G on the 110 is flat at the 12th. The guitar was really dry so I humidified it for a week. The Neck is dead straight, the action at the 12th is .60 on the treble and .90 on the bass. When we were hanging out last week playing I didn't hear anything weird as far as intonation goes. All I have done is clean it up and shave 40 thou from the saddle. Is there something I am missing here? G string is just really bad at the 12th, never had an acoustic do this...yet...

Thanks Everyone!

 Dave

[Paul Verticchio]

Check the condition of the strings.  If they're worn out, that could be the cause.

If they're new & completely stretched, you have to address the intonation issue at the saddle, specifically it's compensated shape under the G string.

The guy isn't using a plain string for his G string, is he?  If he is, switch him over to a wound G and the problem will most likely vanish.

Is it flat or sharp?

Hope some of that is relevant :-)