Slab Foundation Repair in Pelham, NH
A dropped slab under a garage or step is a support question, not a cosmetic one.
Which route fits the concrete?
Separate floor
A basement floor within another foundation may not carry the building.
Bearing slab
Connected wall, door, and floor changes deserve measurement of the load path.
Outdoor panel
A dropped patio or drive belongs in concrete repair unless the house also moved.
Diagnosis: Separating Slab Movement From Floor Wear
Start by identifying what the concrete supports. A load-bearing slab transfers building loads into the ground. A separate basement floor can carry people and equipment without being the foundation. In Pelham, a hypothetical parking pad or front step can drop without meaning the foundation has failed. Measure the gap at fixed edges: the pad against the garage door, the step against the entry threshold. Note crack width, direction, and whether doors stick or thresholds slope. ACI RAP-1 discusses structural concrete cracks, and ACI RAP-7 covers horizontal repair preparation. The goal is evidence: is movement active, and does it affect support?
What Can Stay: Monitoring and Nonstructural Surfaces
Not every dropped slab needs repair. If the concrete is a nonstructural basement floor or a private pad with no bearing load, and the drop is stable, monitoring may be reasonable. Mark crack ends with a pencil line or a dated photo. Check the same fixed edge every few months. If the gap stops changing and no door or step becomes unsafe, the homeowner may choose to leave it. Keep this separate from outdoor flatwork and driveway-entrance rules. ACI RAP-11 discusses slabjacking assessment, which includes checking whether lifting is appropriate, but that is an assessment topic, not a promise that 603 uses slabjacking. The decision is whether support is affected, not whether the surface looks perfect.
Method Selection: Support Repair Versus Cosmetic Leveling
Support repair and cosmetic leveling solve different problems. Cosmetic leveling tries to make a surface flat again. Support repair addresses what holds the slab up. For a load-bearing slab, the method depends on access, load path, and whether the movement is active. In a Pelham home, a garage slab carrying a post is a different scope than a basement floor that only looks uneven. Ask what will be measured before and after, and whether the repair is meant to restore support or only improve appearance. Do not assume piers or epoxy are always required.
ACI’s structural-slab distinction is general technical guidance, not a specification for this house.
Pelham scope and local context
Pelham’s forms page lists a general building-permit application and a separate new-dwelling application. Those forms are a reminder to define the proposed structural scope clearly, not proof that every slab repair needs a permit. For a Pelham home, we document whether the affected concrete carries a wall or post, the measured change, and any connected foundation symptoms. The owner can then confirm the applicable review with the town for that actual work.
Read the Pelham source. We check the approval path against the proposed scope.
What Can Go Wrong or Fall Outside a Slab Scope
A slab repair can be the wrong fix if the real problem is drainage, a broken pipe, or a failing wall. If water is entering, fixing the slab surface may not stop it. If a foundation wall is bowing, the slab is not the primary issue. Outdoor flatwork, driveway entrances, and road access are separate from a load-bearing slab. Do not let a small leveling request turn into an assumed driveway reconstruction. If the scope includes changing an entrance, that is a different review path. A design professional may be needed when the slab supports structure or when movement is ongoing.
What homeowners say about working with 603
Site constraints: load path, access, and measurements
A slab supporting a column cannot be evaluated like an isolated garage floor. Identify bearing points, accessible edges, any concealed heating or plumbing, and where equipment could safely reach the work. Use the same wall or column reference points for repeat measurements. If finishes hide the connection, the written scope should say what remains unknown and whether opening work or a design professional’s review is needed before choosing a repair.
Written Estimate: What to Measure Before Pricing
A written estimate for slab and foundation repair should list what was measured and what was excluded. Ask for the slab dimensions, the largest gap, the crack pattern, and whether the slab is load-bearing. It should identify fixed reference points and any area hidden behind a finished floor or wall. The estimate should separate support work from cosmetic leveling and state whether monitoring is an option. If more investigation or a design professional is needed, name that step before assigning a repair method. Do not accept a price that assumes a method without inspection.
No-Work Decision: When Monitoring Beats Repair
Sometimes the right answer is no work today. If the slab is nonstructural, the movement is small, and fixed edges are stable, monitoring can be the honest choice. Set a reminder, photograph the crack, and check the same reference point. If the slab carries a wall or post, or if doors and thresholds change, get a design professional involved before repair. A dropped private parking pad is not the same as changing a road entrance. A smaller scope, or no scope, can be correct when the evidence does not show active structural movement. We look at what the slab supports and whether the movement is still active.
Related repairs if this is a different problem
One question for the inspection
How do I know if my Pelham slab is load-bearing or just a basement floor?
Look at what the concrete supports. Nearby walls or posts make the load path worth checking, but appearance does not settle it. A separate basement floor can support normal room use without carrying the house. Measure the gap at a fixed edge, such as a garage door or entry threshold, and note whether cracks are widening. A design professional may be needed for load-bearing movement. 603 can inspect and document the condition, but no repair method is guaranteed until the slab is evaluated.
Get a straight answer in Pelham
Show us the concrete and we will tell you what is worth fixing, what can stay, and what still needs checking.
