Combine the flour and salt in a large bowl. Using the large holes of a box grater, grate the frozen butter.
Add the butter to the flour and toss to coat completely.
Make a well in the center of the flour mixture and gradually add the cold water, beginning with ½ cup and adding additional water if needed.
Gently fold together the flour and water just until it forms a dough. (Use a fork or pastry cutter if desired). Divide the dough into two discs.
Roll out one disc into an 11-inch circle on a lightly floured surface. (If making a lattice-topped or double-crust pie, roll the other disc into a 10-inch circle, place on a large baking sheet, and refrigerate.)
When ready to use, fit the dough into a 9-inch pie plate, crimp the edges, and refrigerate until ready to fill.