Interstitial condensation - dew point

[mobe]

Hi All,
Does anybody know where I could download a copy of a programme to work out the above?
There used to be freebie discs given away by manufacturers of insulation but these appear no longer available....
Yours in anticipation. M.

 

[BryanStein]

I've got a chart, but don't know where I got it. Do a google search. it'll come up.