Strange as it may seem, I have never done a half-inch binding. Few of my quilts are large and some are tiny, so I have only ever done a quarter, and eighth of an inch binding. I don't think I have done a double-fold binding either (though I might have tried one? just can't remember). I am now faced with having to do a half inch, double fold binding!
I can probably work out what width to cut the binding strip, but I simply don't know whether I should join it to the quilt with a half inch seam allowance to both binding and quilt (like one does a quart inch to both on the quarter inch binding), or whether one is a half and one a quarter; and, if so, which way does it go? Ah, I realise I need to know this in order to work out the cutting width. Doh!
Help from anyone would be much appreciated - it's funny where one's knowledge gaps are, isn't it >g<