Should drainage problems be corrected before concrete repair or replacement?
Address a known drainage problem in the concrete project plan before finalizing repair or replacement. Water routing, surrounding grades and slab support can affect whether the selected work solves the actual problem. This does not mean every drainage task must be completed first; it means the sequence and responsibilities should be settled before the concrete hides or constrains the relevant conditions.
For new concrete, plan the finished grades and where water is intended to go, including transitions at doors, steps, lawns and adjacent paving. For an existing slab, distinguish its own low spot from water arriving from elsewhere. Ask the responsible professional to explain the complete path and any applicable approvals. This answer does not provide a universal slope or authorize discharge onto another property.
Safety boundaryDo not excavate channels, alter grades near retained trees or cut concrete as an improvised drainage experiment. Locate buried services and use appropriate dust and site controls for professional work.
See what changes by location
What changes by state, city and property?
The national answer stays the same, while these local or property variables can change the next step: Water sources, destination and adjacent grades; Slab support and building relationship; Local drainage, access and permit requirements.
U.S. national guidance
What changes after you choose a location?
Choose a state to make the geographic boundary explicit.
A ZIP code can help screen service availability; it does not establish a local fact, price, permit rule or provider commitment.
Applies nationallyThe explanation, safe observations and comparison questions apply as general U.S. homeowner guidance.
Must be confirmed locallyPermits, adopted codes, licensing, property responsibility and provider availability must be confirmed for the actual location and scope.
Separate condition, intended use and project scope
Which situation best matches the project?
01
The existing slab receives water from outside the work area
Identify visible sources such as surrounding landscape flow or roof-water discharge and have them assessed with the slab. Replacing the concrete without changing an unresolved incoming path may leave the same water problem. Ask which part of the solution belongs to the concrete contractor and which requires a drainage professional or another trade. A clear division of work is better than both assuming the other will handle it.
Notice next: Provide safe rainfall observations and existing drainage records. Request a coordinated scope and sequence before accepting the concrete estimate.
02
The slab itself has settled or directs water incorrectly
Assess its shape and support together with the intended final elevation. A suitable lifting or replacement plan should state the drainage result, not simply promise a level surface. ACI cautions that lifting does not automatically correct poor underlying soil. Ask what site condition contributed to settlement and whether the repair includes a meaningful response to it.
Notice next: Collect the movement history and photographs of adjacent transitions. Have the target result and remaining limitations written into the proposal.
03
You are planning new concrete and surrounding grading
Set the drainage objective while the layout is still flexible. Consider how the new surface connects to buildings, existing paving and landscape areas, and identify the intended collection or discharge route. The design must fit the actual property and applicable requirements. Do not leave final grades to a casual decision after concrete delivery has begun.
Notice next: Review the layout and water route with the responsible designer and contractor. Ask which approvals, elevations and preparation checks must be complete before placement.
Safe observation
What to record before contacting a professional
Use only safe, non-destructive observations and existing records. Do not create access or disturb a hazard to complete this list.
These observations organize a conversation; they do not diagnose the property or prove service availability.
What to record
Record safe observations of ordinary rainwater paths and collection points without deliberately flooding the property.
Collect existing site, drainage and utility plans and identify information that remains uncertain.
Photograph doors, steps and adjacent surfaces whose elevations constrain the project.
List prior water, soil, foundation and paving work so the design can consider the whole site history.
Stop and get appropriate help
Stop a project that leaves the destination of redirected water or a required permission unresolved.
Escalate building movement or instability beyond surface drainage and flatwork planning.
Move from information to action
Who is the useful next contact?
Drainage or site-design professional
Use this contact for water sources, grades and the intended outlet or collection path. Ask for the full problem to be addressed rather than only the visible puddle.
Where is the water coming from and where will it go afterward?
Which drainage work is included, separate or dependent on another trade?
What elevation and support conditions must be confirmed before placement?
How will the final result be documented and checked?
Concrete contractor
Use the contractor to coordinate slab preparation, finished elevations and the agreed drainage result with the placement plan.
Where is the water coming from and where will it go afterward?
Which drainage work is included, separate or dependent on another trade?
What elevation and support conditions must be confirmed before placement?
How will the final result be documented and checked?
Local authority or structural professional as indicated
Use the actual authority for property-specific approval questions and structural assessment where building support or movement is involved.
Where is the water coming from and where will it go afterward?
Which drainage work is included, separate or dependent on another trade?
What elevation and support conditions must be confirmed before placement?
How will the final result be documented and checked?
Contact guidance explains who may help and what to prepare. It does not verify a provider, price, license, arrival time or acceptance of this request.
Professional help
Use this guide to prepare for a qualified local professional.
Call Home Help does not currently have a verified phone connection for this service. We will not ask for a ZIP code or show a number until the campaign fields, endpoint and current routing conditions have been checked.
Phone connection not currently available
Check licensing, service area, schedule, scope and written estimate directly with professionals you consider.
Short answers
Questions people ask before the call
Must all drainage construction happen before any concrete work?
The sequence depends on the design, but the responsibilities and intended result should be agreed in advance. Do not leave the drainage solution undefined until after placement.
Will a new slab fix runoff from a roof?
Not automatically. The incoming water source and surrounding drainage must be considered in the plan.
Can the contractor use a standard slope everywhere?
No universal slope is provided here. The finished surface must fit the actual site, use, transitions and applicable requirements.
Sources and boundaries
What supports this guide?
National Ready Mixed Concrete Association — CIP 14 — Finishing Concrete FlatworkFinish should suit the use; exterior surfaces need drainage and suitable wet traction; broom texture differs from a smooth troweled finish. Boundary: Qualitative concrete-material guidance, not an adopted local code, structural design, mix order, repair warranty or property diagnosis. No numerical specifications or use schedules are imported. Scope: national. Source checked 2026-09-22. Confirm address-specific requirements with the relevant local authority or qualified professional.
National Ready Mixed Concrete Association — CIP 32 — Concrete Pre-Construction ConferenceAgree responsibilities, specifications, scheduling, site operations, acceptance criteria and handling of changes before placement. Boundary: Qualitative concrete-material guidance, not an adopted local code, structural design, mix order, repair warranty or property diagnosis. No numerical specifications or use schedules are imported. The homeowner checklist is an editorial adaptation, not a requirement to hold a commercial-scale conference. Scope: national. Source checked 2026-09-22. Confirm address-specific requirements with the relevant local authority or qualified professional.
American Concrete Institute — Concrete Repair Application Procedures: Slabjacking (RAP-11)Slabjacking raises settled slabs by controlled injection under them; suitability depends on slab condition, underlying support and the intended correction. Boundary: No residential success rate, price comparison, universal tolerance or site suitability is established. Scope: national. Source checked 2026-09-22. Confirm address-specific requirements with the relevant local authority or qualified professional.
Common Ground Alliance / 811 Before You Dig — 811 Before You DigArrange utility-location notification before ground disturbance; do not rely on old assumptions about buried facilities. Boundary: State notice periods, ticket duration, mark tolerance and private-line arrangements must be verified locally; no digits are presented as a call path. Scope: national. Source checked 2026-09-22. Confirm address-specific requirements with the relevant local authority or qualified professional.
CDC / National Institute for Occupational Safety and Health — Silica and Worker Health | Silica | CDCCutting, drilling and grinding concrete can create hazardous respirable silica dust; professional exposure controls are needed. Boundary: This is hazard guidance, not a household exposure measurement, medical diagnosis or complete contractor control plan. Scope: national. Source checked 2026-09-22. Confirm address-specific requirements with the relevant local authority or qualified professional.
University of Minnesota Extension — Moisture in basements: causes and solutions — University of Minnesota ExtensionWater directed toward a foundation and concentrated roof runoff can contribute to moisture problems; investigate water source and drainage. Boundary: No source-specific grading dimension or drainage system design is made a national code. Water intrusion is not automatically a foundation failure. Scope: state. Source checked 2026-09-22. Confirm address-specific requirements with the relevant local authority or qualified professional.
University of Maryland Extension — Damaged Tree Roots | University of Maryland ExtensionRoot injury can arise from excavation, compaction, altered soil conditions and other stresses; avoid unplanned injury and seek tree assessment. Boundary: Does not diagnose building movement, establish safe root-cutting distances or identify buried roots from a surface photograph. Scope: national. Source checked 2026-09-22. Confirm address-specific requirements with the relevant local authority or qualified professional.
No drainage design, slope, outlet permission or capacity calculation is supplied.
Hidden soil conditions and the cause of past water problems remain unverified.
The proper construction sequence must be established for the actual project.