Mix flour and salt. Add ice water gradually. Mix into shaggy dough.
Knead gently for 2 minutes. Shape into flat rectangle.
Wrap in plastic. Refrigerate 30 minutes.
Pound cold butter between parchment into 8x5 inch rectangle.
Roll dough into 10x16 inch rectangle.
Place butter in center. Fold dough over like a letter. Seal edges.
Roll out to 10x20 inches. Fold into thirds.
Rotate 90 degrees. Roll and fold again. That is 2 turns.
Wrap and chill 30 minutes.
Repeat rolling and folding 2 more times for 4 turns total.
Chill 30 minutes between each set of 2 turns.
After final turn, wrap and refrigerate at least 2 hours.
Roll to ⅛ to ¼ inch thickness when ready to use.