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Reviewed and updated September 22, 2026

Should drainage problems be corrected before concrete repair or replacement?

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.

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.

More context for this decision

Details that can change the next step

Use the sections that match what you can safely observe. They add context without diagnosing the property from a distance.

What should be done when a patio slopes toward the house?

What should be done when a patio slopes toward the house?

What should be done when a patio slopes toward the house?

A patio that directs water toward the house needs a drainage assessment before a surface repair is selected. The goal is an effective water path away from the foundation to an appropriate outlet, considering doors, adjacent grades and site constraints. Building America guidance discusses grading and drainage alternatives where a simple outward slope is not feasible.

Observe actual water movement safely

From a sheltered, safe location, note where rainwater collects, how it reaches the wall and where it eventually leaves. Photograph the patio, door thresholds, downspout outlets and surrounding grades. Do not recreate flooding with a hose beside a vulnerable doorway.

If water is entering near electrical equipment or an unstable area, avoid that area and obtain the appropriate urgent help before investigating the patio.

Ask whether the problem is shape, settlement or discharge

Have a qualified concrete or drainage professional measure the relevant elevations and identify the water sources. A patio installed with an inward fall, one that has settled and one overwhelmed by additional runoff may need different responses.

Request options that explain the entire outlet path. A drain without a suitable destination is not a complete drainage proposal.

Compare corrections before choosing a finish

Ask whether replacement, an appropriate level correction or a drainage redesign can achieve the intended result. Have door clearances, foundation details and neighboring property effects reviewed before changing elevations.

Do not treat a decorative overlay as an automatic way to correct an unknown slope.

Useful written outcome: existing and proposed elevations, intended drainage direction, outlet responsibility and how performance will be checked. The repair should solve the water route, not merely make the patio look level.

How should concrete cross a drainage swale without blocking water flow?

How should concrete cross a drainage swale without blocking water flow?

How should concrete cross a drainage swale without blocking water flow?

A concrete crossing should preserve the drainage swale's intended flow rather than create a raised barrier or send water toward the house. Decide how water will pass the crossing before choosing the paving elevation. Building America guidance treats swales and other drainage measures as parts of an overall water-management path.

Identify the swale and its destination

Gather a survey or drainage plan when available. Photograph the route before, during and after ordinary rain from a safe location, noting where water enters and leaves the property.

Ask whether the swale is part of an easement, a subdivision drainage system or another regulated arrangement. Confirm that with the appropriate local authority rather than assuming the depression is simply an unused part of the lawn.

Have the crossing designed for the actual flow

A drainage professional may evaluate a shaped surface crossing, a culvert or another detail. The correct choice depends on the site; this answer does not size a pipe or establish that any one method is suitable.

Ask how the proposal handles blockage, overflow and maintenance, and how the walking or driving surface will remain usable.

Coordinate permissions and construction

Include excavation limits, utility locating, inlet and outlet treatment and restoration of the surrounding grades. Have the finished elevations checked against the approved plan before accepting the work.

Do not fill the swale merely to create a level base for the concrete contractor.

Completion question: “Can water still follow the intended route, including at the crossing and downstream?” An attractive paved path is not a successful project if it interrupts the drainage function that existed before it.

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
  1. Record safe observations of ordinary rainwater paths and collection points without deliberately flooding the property.
  2. Collect existing site, drainage and utility plans and identify information that remains uncertain.
  3. Photograph doors, steps and adjacent surfaces whose elevations constrain the project.
  4. 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.

The available connection is limited to eligible new concrete projects. This guide remains available for decision support without presenting an ineligible phone route.

Repair-only concrete work is not connected by this line

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.

Where this guidance applies

The explanation, safe observations and comparison questions apply as general U.S. homeowner guidance.

Permits, adopted codes, licensing, property responsibility and provider availability must be confirmed for the actual location and scope.

A ZIP code can help screen service availability; it does not establish a local fact, price, permit rule or provider commitment.

Sources and boundaries

What supports this guide?

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.