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Preheat oven to 400 degrees with a rack set in the center of the oven. Line a baking sheet with parchment paper and set aside.
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In a large bowl, use your hands to mix together flour, salt, baking powder, and baking soda. Add butter to flour mixture, and use your hands to mix just until medium pebble-size pieces form. Do not overmix. Add buttermilk and mix just until dough comes together.
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Turn dough out onto a lightly floured work surface. Flatten and shape dough to form a 2-inch-thick square. Lightly flour top of dough; fold in corners and repeat process to create layers.
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Using a 2 1/2-inch round biscuit cutter, cut out 8 biscuits, rerolling scraps as necessary. Place on prepared baking sheet and brush tops with buttermilk; transfer to oven and bake, rotating baking sheet halfway through, until golden, about 10 to 12 minutes.
