Pour flour and salt in a medium mixing bowl or the bowl of your food process. Mix or pulse to combine.
Cut shortening and butter into small cubes. Add to the flour mixture.
If you're using a food processor, pulse briefly until the fat is incorporated into the flour looks like small pee-sized bits. If you're not using a food processor, use a pastry cutter to cut in the fit until it's in pee-sized bits.
If using a food processor, pulse briefly as you stream in the ice water, starting with only 5 Tbs and only added more water if needed, until the dough comes together but it not flaky nor overly wet. Be careful not to overmix! If you're doing this by hand, at the water and mix gently with a fork until dough comes together, starting with 5 Tbs of water and adding more only if needed.
Generously flour a counter or tabletop and turn out your dough onto the surface. Using your hands, bring the dough together until it's in a neat ball (again, be careful not to overwork!) and then cut the dough in half and reform the two pieces into neat balls.
Roll out the balls one at a time on the floured surface, adding more flour as needed to prevent sticking.
Transfer the rolled dough into a pie tin, cut away any excess, and crimp the edges. Repeat with the second pie crust unless you're using it to place on top of your pie for a double crust. In this case, add your fillings, and then top with your second pie crust. Add slits to the top to allow steam to escape while baking.
Bake according to your pie recipe instructions.