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Old Sandstone and Stone Foundations in the Mahoning Valley
Updated · Holdfast editorial
Short answerMany Mahoning Valley homes built before about 1940 have sandstone, fieldstone or brick foundations laid in soft lime mortar. The mortar erodes as water passes through. Repointing with compatible mortar, adding interior drainage and controlling humidity keeps them sound.
Why they fail
Decades of water movement and freeze-thaw wash out mortar, loosening stones and letting soil in.
What not to do
Hard cement mortars and sealing coatings can trap moisture and damage soft stone.
Repair
Why mortar choice matters
Old sandstone and fieldstone walls were laid in soft lime mortar that lets moisture escape. Repointing with hard portland cement mortar traps water in the stone and can speed spalling and cracking. A lime-based mortar matched to the wall is the usual recommendation.
Old Sandstone and Stone Foundations in the Mahoning Valley: follow-up questions
Is a stone foundation worse than block?
Not necessarily. Well-maintained stone foundations last a long time; they need compatible mortar and good drainage.
Can a stone basement be finished?
Only after water is controlled and the wall is repaired; many owners leave stone walls exposed and breathable.
Every home differs; editorial standards.