This is my first build so I apologise for my ignorance.

I decided to put frets on my 3 string slide cbg.

I am trying to figure out the spacing of my frets. I am aware of fret calculators and I figured I have a 26" length. However, I noticed when checking for the 12th fret position with my tuner and slide the placement is different than if I use the tuner and just press the string down to the finger board. The difference is about a 1/4". I realize pressing down the string stretches it to a slightly higher pitch, especially when you have a higher action for sliding. I plan to slide mostly when playing but I will also fret a string here and there too while sliding. So does this mean the length is 26.5" instead of 26"?

Thanks in advance for straightening me out.

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You will definitely need to lower your action (String height), you should be less than 1/8" at the 12th fret (more like .1")  The fret positions don't change due to the stretch, you push the bridge back just a bit.

If you look at stew-mac's fret calculator, it will estimate bridge position, based on standard string action.

when  checking with the slide  are you  above the  forward  fret  ?  or  inbetween  frets as  fingering  ? 

the slide should be  above the fret bar  .

also  measure  from the  middle of the nut    to  the 12th  fret  ..  then  from the 12th to  the mid bridge  .  the 2   mesurments should match   if bridge is  in the right spot .  .   if they  do  , then  measure  from  mid nut to  bridge  .  that  is  your  scale  .

hope that helps  .  

String height will stretch and highten pitch.

Quick calculation ... (Scale length x 0.9439 = fret 1) x 0.9439 = fret 2) x 0.9439 = fret 3) etc etc..

Half string harmonic  should be at 12th fret. 

Anything else is either string thickness, height. 

We do what we can with wood and stuff and everything in between is just the blues.

Thank you, I will definitely test this calculation out. 

I've almost resigned to the thought that the frets will be intone either when I press the string down or when I slide directly over the fret but not both. This is because pressing the string down stretches it to a slightly higher pitch. So I need to choose whether sliding directly over the fret or pressing down will produce a true tone. I am inclined to go with the later and that way I get a true tone on fretted notes and I will get used to sliding a little passed the fret to get intone chords. I hesitate to lower the action cause I dont want fret buzz when sliding. Fortunatley I have an adjustable height/length bridge.  I was just wondering how most builders deal with this.

If I had to build frets into a very high action guitar I think I would try using something wrapped around the neck that would act as an adjustable fret.
I would keep all the strings in place and tuned correctly and figure each fret position manually using a tuner working my way up the neck.

I'm not sure if this would work or not I have never tried it. I just thought about it.

Try fishing line; that's what they use on fretless Middle Eastern ouds and Eastern European lutes to teach finger positioning.

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