Mix the flour and salt in a large mixing bowl and add the chilled butter and use a pastry cutter or pastry scraper to cut the butter into the flour. (If you don't work in a cold environment, put the flour, salt and chilled butter in a freezer safe mixing bowl and keep in the freezer for 10-15 minutes before starting which will help the butter not to warm quickly when working. This step will also help to keep the work surface cold when you roll out the dough)
Make a well in the center of the flour and pour in the ice cold water. Take the flour mixture from the sides and start to mix with pastry scraper. Don't use your hands as they can warm the butter easily. Use your hands quickly at the end to bring the dough together and shape it into a ball.
Put the dough onto the work surface. Flour the work surface and the rolling pin so the dough doesn’t stick to either. Roll out the dough into a 10 inch(25 cm)long rectangle. Add more flour as needed. Brush off the excess flour with a pastry brush. Fold the bottom one-third of the dough towards the center, and the top third over that. While folding, brush off the excess flour as needed.
Give the dough a quarter turn, and make the same steps at least 3 more times up to 6 times.
Wrap the dough in plastic film and refrigerate at least for 1 hour or freeze 20-30 minutes before using.