Combine gluten free flour, and salt, then add the cold butter. Cream the dry ingredients with cold butter using your fingers.
Add the water in 3 batches while mixing in between. Incorporate gently until the dough starts to hold together.
Transfer the dough to a cold surface, lightly dusted with flour, then slightly knead to form a ball.
Shape the dough into a rounded square, wrap with a cling film, and rest in the fridge for at least 30 minutes.
Roll out the cold dough to a thickness of about 3-4 mm (0.16 in) between parchment papers to prevent the dough from sticking to the work surface. You may use a Measuring Dough Strip when rolling out the dough. Not only will you get a uniform thickness, but it also gets the job done in a flash.
Preheat the oven to 180°C (356°F). Cut the flattened dough according to the size of the pie dish or tart tins.
If required, blind-bake large pie crust for 15-20 minutes.
For small tart crusts, bake for 15 to 18 minutes.
Cool at room temperature before filling.