Settlement is a symptom, not a diagnosis
A low panel shows that elevation changed; it does not prove why. The inspection should look for water paths, voids, recent plumbing or utility work, root activity, washout, adjoining construction, and the direction of movement.
Regional soil and weather information can provide context, but a map cannot reveal the exact fill, leaks, drainage, or construction history beneath one slab.
Water deserves a deliberate review
Roof runoff, downspouts, irrigation, pool splash-out, broken drains, plumbing leaks, and neighboring grades can move or concentrate water. Lifting without addressing an active source may leave the underlying condition in place.
- Photograph the area during or shortly after rain
- Note downspouts, drains, irrigation heads, and low spots
- Mention known plumbing leaks or recent underground work
- Watch for soil loss at slab edges or open joints
Ask the provider to state the cause hypothesis
The answer may remain uncertain without testing, but a competent proposal should explain what was observed, what is assumed, what conditions are excluded, and what owner actions are recommended after lifting.
Related questions
Can drought make concrete move?
Moisture changes can influence some soils, but the effect varies by site, depth, fill, vegetation, drainage, and construction. An inspection should consider multiple causes.
Should I fix drainage before lifting?
Active leaks, erosion, or concentrated runoff may need correction before or alongside lifting. Coordinate the sequence with the relevant contractors.
Can tree roots make a slab look sunken?
Roots can lift one area, remove support as they decay, or complicate repair access. An arborist may be appropriate when significant roots are involved.
Evidence used for this decision guide
Reviewed 2026-07-24. Sources explain the general method or decision. They do not diagnose one property, select a provider, or guarantee a result.
Primary answer
Concrete settles when support beneath it changes or was insufficient. Possible contributors include poorly compacted fill, erosion, drainage, leaking water, moisture-related soil movement, decaying roots, utility trenches, and slab or joint design.
General decision support only. The cited material does not diagnose subsurface conditions, select a contractor, or guarantee an outcome for one property.Supporting claim
Settlement is a symptom, not a diagnosis: A low panel shows that elevation changed; it does not prove why. The inspection should look for water paths, voids, recent plumbing or utility work, root activity, washout, adjoining construction, and the direction of movement.
This section summarizes general decision criteria within the cited sources' combined scope. It does not establish the condition, cause, compliance status, or repair fit of one property.Supporting claim
Water deserves a deliberate review: Roof runoff, downspouts, irrigation, pool splash-out, broken drains, plumbing leaks, and neighboring grades can move or concentrate water. Lifting without addressing an active source may leave the underlying condition in place.
This section summarizes general decision criteria within the cited sources' combined scope. It does not establish the condition, cause, compliance status, or repair fit of one property.Supporting claim
Ask the provider to state the cause hypothesis: The answer may remain uncertain without testing, but a competent proposal should explain what was observed, what is assumed, what conditions are excluded, and what owner actions are recommended after lifting.
This section summarizes general decision criteria within the cited sources' combined scope. It does not establish the condition, cause, compliance status, or repair fit of one property.Review 6 authoritative sources
RAP-11: Slabjacking
American Concrete Institute
Slabjacking is used to level and align slabs-on-ground affected by settlement, erosion, flooding, or shrinkage of supporting soil or base.
Limit: A voluntary field guide, not a diagnosis, design, bid specification, or guarantee for a particular property.Slabjacking (RAP 11) learning objectives
American Concrete Institute University
Appropriate repair selection, hole layouts, settlement mode, grout-pressure monitoring, and verification are core parts of slabjacking practice.
Limit: Summarizes a professional education module; it does not select a method or target for one slab.Web Soil Survey
USDA Natural Resources Conservation Service
Official mapped soil information and interpretations can provide regional and property-area context.
Limit: Mapped soil data cannot reveal exact fill, compaction, leaks, utilities, erosion, or support beneath one slab.Houston IAH climate normals and annual summaries
National Weather Service Houston/Galveston
Houston-area climate normals document substantial annual rainfall and seasonal temperature conditions relevant to regional drainage context.
Limit: IAH station normals are regional context, not Tomball parcel data or proof that weather caused one slab to move.How to Avoid Home Improvement Scams
Office of the Attorney General of Texas
Texas consumers are advised to obtain multiple detailed written bids, read contracts carefully, include promises in writing, keep records, and avoid full payment before satisfactory completion.
Limit: General consumer guidance, not legal advice for one contract or a statement that concrete leveling is a state-licensed trade.How to Avoid a Home Improvement Scam
Federal Trade Commission
Consumers should compare estimates, verify business and insurance information, read written contracts, and avoid paying the full project amount up front.
Limit: General federal consumer guidance. State and local contract requirements can add obligations.Build a comparable project scope
The guide prepares a decision; it does not diagnose the property or endorse a provider.
- The affected surfaces and visible constraints
- The same questions and photos for each provider
- Written material, target, exclusions, payment, and warranty terms