Fallingwater’s stone walls were constructed by hand using Pottsville sandstone quarried from the site and laid in irregular patterns to mimic the natural formations found in the landscape. Seasonal expansion and contraction created by fluctuations in temperature cause hairline cracking in the mortar joints, allowing water to find its way inside the walls.

Fallingwater’s stone walls were constructed by hand using Pottsville sandstone quarried from the site and laid in irregular patterns to mimic the natural formations found in the landscape. Seasonal expansion and contraction created by fluctuations in temperature cause hairline cracking in the mortar joints, allowing water to find its way inside the walls.

Fallingwater’s stone walls were constructed by hand using Pottsville sandstone quarried from the site and laid in irregular patterns to mimic the natural formations found in the landscape. Seasonal expansion and contraction created by fluctuations in temperature cause hairline cracking in the mortar joints, allowing water to find its way inside the walls.