Pennsylvania’s geology creates two ground-movement risks that many homeowners don’t think about until cracks appear. In the coal regions of the northeast and west, old underground mines can collapse decades after they closed. In the limestone (karst) areas of the Lehigh Valley and the Lancaster, Berks and Cumberland Valley region, water can dissolve bedrock and open sinkholes. Both can crack foundations, tilt floors and split walls — and neither is usually covered by a standard homeowner policy.
The earth movement exclusion
Most homeowner policies contain an earth movement exclusion. It typically lists earthquakes, landslides, mudflow, subsidence and sinkholes, along with soil shifting, expansion and settling. Some policies carve out exceptions, such as fire or explosion that follows earth movement. The details vary, so read your own policy’s definitions and any endorsements.
Because of this exclusion, a crack in a foundation may set off a coverage dispute rather than a valuation dispute. That distinction matters for appraisal, which values the amount of a covered loss but doesn’t decide whether a loss is covered.
Mine Subsidence Insurance (MSI)
Pennsylvania offers a separate safety net for coal mine collapse. The Mine Subsidence Insurance program, run by the Pennsylvania Department of Environmental Protection, offers coverage for damage caused by the collapse of underground coal mines. It is separate from your homeowner policy and has its own application, terms, limits and claim process.
Who should look into it
Owners in areas with a history of underground coal mining — much of the region around Scranton and Wilkes-Barre, parts of the Pittsburgh area and Johnstown, and many smaller towns in between — often find that their property sits above or near old workings. DEP provides information about mined areas and how to apply. Because MSI is a distinct program, check its current terms directly rather than relying on what a neighbor bought years ago.
Making an MSI claim
If you see new cracks in foundation walls, doors and windows that suddenly stick, sloping floors or separation between walls and chimneys, document the damage and contact the program promptly. Claims typically involve an investigation to determine whether mine subsidence caused the damage. The program’s rules control how disputes are resolved, so read the policy you receive.
Sinkholes in karst country
Limestone bedrock runs under a large swath of south-central and southeastern Pennsylvania. As water moves through cracks in the rock, it slowly dissolves it. Heavy rain, broken water or sewer lines, and poorly managed stormwater can speed the process and cause the ground above to drop.
Sinkhole damage is often excluded or limited under homeowner policies. Some insurers sell endorsements; many don’t. Read the policy before the ground moves, not after.
When water causes the hole
Sometimes a covered event — a sudden pipe break, for example — contributes to ground collapse. Whether any resulting damage is covered depends on the policy’s wording about water damage, earth movement and how the two interact. That’s a coverage question for a Pennsylvania attorney, not an appraisal panel.
Where appraisal fits
Appraisal becomes relevant once coverage is accepted and the disagreement is about the amount of loss. Examples include:
- An insurer accepts a fire or explosion loss that followed ground movement but undervalues the repair.
- A water-related collapse is accepted under a homeowner policy but the scope of foundation and interior work is disputed.
- Any policy, including a separate program policy, contains an appraisal provision and the parties disagree only on value.
In those cases, foundation repair, underpinning, structural engineering, interior crack repair and finishes all need careful pricing. Structural work is expensive and estimates can differ widely, so detailed engineering reports and contractor bids make a real difference.
Documenting ground-movement damage
- Photograph cracks with a ruler or tape measure for scale, and date each photo.
- Mark the ends of cracks with a pencil and recheck them over time to show movement.
- Note doors and windows that bind and floors that slope, with simple level readings.
- Keep records of water bills, plumbing repairs and any recent excavation nearby.
- Consider a structural engineer’s inspection before major repairs.
Deadlines and next steps
Ground-movement damage can develop slowly, which makes the date of loss harder to pin down. Many Pennsylvania property policies require a lawsuit within one year of the date of loss, and appraisal may not pause that clock unless the policy or a written agreement says so. Read our one-year suit limitation guide, and talk to an attorney early.
If coverage has been accepted and the dispute is over value, our home insurance claim appraisal service can help. For background on terms like earth movement and recoverable depreciation, see our claim terms glossary.