Foundation Repair and Inspection for Arlington Homes

Foundation repair in Arlington begins with a classification

Most of what Arlington homeowners are told is a foundation emergency is a water problem with a foundation address. The cracks, the damp, the flaking surface and the musty crawl space are real, but they are usually caused by ground that slopes toward the house, a downspout discharging at the wall or a neighbor's yard draining onto the property — and those are drainage repairs, not structural ones.

The first visit therefore does one thing before anything else: it sorts what is there into two groups.

Cosmetic

Hairline cracks, shrinkage cracks, a gap at a joint, parging coming away in sheets, efflorescence and damp staining. Repaired by cleaning and drying the wall, grooving the crack, injecting epoxy, resurfacing and coating — and by fixing the water outside.

Structural

A floor that has dropped out of level, a basement wall bowing inward, a crack wider at one end than the other or one that reopens after being filled, doors and windows in one part of the house all gone out of square together. These call for a structural engineer to measure, assess and specify the repair before any price is written.

The general method for each is set out on the main foundation, grading and crawl space repair page. This page is about how it applies in Arlington.

Cracks in Arlington block and brick foundations

Much of Arlington's older housing was built with foundations of concrete block or brick rather than poured concrete, and those materials crack differently. A poured wall tends to crack in a single line from a stress point; a block or brick wall cracks along its joints, in steps, and the mortar fails before the masonry does. That makes an Arlington foundation inspection partly a reading of mortar joints.

• Stepped cracking that follows the joints with the blocks themselves intact is usually movement at a corner or a footing, and its width and whether it is growing decide whether it is cosmetic or an engineer's question.
• Horizontal cracking along a course in a basement wall, especially with water seeping in at the footing, points to lateral soil pressure — the condition behind a bowing wall, and the one case where you are asked not to wait.
• Parging and surfacing coming away from block looks alarming and is a resurfacing job: loose material off, mesh and scratch coat on, exposed cracks filled with mortar, an asphalt coating below grade before the soil goes back.
• A crack at a penetration — where a gas pipe, water service or drain passes through the wall — is nearly always local and repairable.

Cosmetic cracks are repaired in a fixed order: the wall is cleaned of every loose or powdery particle and allowed to dry, the crack is chiseled into a V groove so the filler has something to key into, a 4000 PSI concrete epoxy is injected and struck off smooth, the wall is sanded, any mold is treated, and two coats of a mildew-resistant masonry waterproofer go on. Skipping the drying or the groove is why a lot of crack repairs reopen within a year.

Arlington crawl spaces that hold water

In Arlington a foundation question very often starts in the crawl space: standing water after rain, insulation hanging wet from the joists, a smell that reaches the living room. Arlington is on public sewer throughout — the County's own plant treats about 23 million gallons a day and no septic areas have been identified — so water in a crawl space here is groundwater or surface water, never a drainfield problem.

What a crawl space needs to be dry and sound is a short list, and the repair is working through it:

1. Clearance. At least eighteen inches between the soil and the framing, which sometimes means removing soil and debris that has built up over decades.
2. A sealed vapor barrier over the ground, with old insulation, torn barrier and rusted hangers stripped out first.
3. Ventilation that works — vents on more than one side, set close to the corners, fitted with screen covers — or a deliberately sealed and conditioned space, but not the half-and-half most crawl spaces have.
4. Sealed walls. Every open crack and gap in the block sealed, since those are where water and rodents come in.
5. Sound framing. Joists and subfloor inspected and reported, loose joists tied to the beam with proper hangers, and only then new insulation.

Where the crawl space has no usable access, one is cut through the block. Insulating over a wet crawl space makes everything worse, so the water is dealt with first — see insulation and air sealing for what goes in once the space is dry.

When an Arlington foundation needs a structural engineer

An engineer is brought in whenever the question is whether something is moving or whether something is carrying load. That is not an upsell; it is the opposite. We would rather you paid for a report than paid us for a repair nobody specified, and we build what the engineer specifies rather than what is easiest to sell.

Signs that the next call is an engineer rather than a contractor:

• A floor measurably out of level across a room, not just springy.
• A wall bowing inward, with or without water at the footing.
• A crack that is wide, wider at one end, or that has visibly grown since you first noticed it.
• A stoop, porch or addition pulling away from the main house.
• Settlement with an obvious contributor nearby — a large tree close to the wall, or a side yard sloping steeply toward the house.

Where there is no access to see what a slab or footing bears on, the engineer's answer is to verify rather than assume — test pits dug by hand to find out whether footings exist and what the soil under them will carry. On the closer-set lots common in Arlington, that excavation is planned around the neighbor's property line and drainage as well as your own.

Grading, downspouts and water management on Arlington lots

This is where foundation money in Arlington is best spent, and it is the least dramatic work on the list. Code calls for a minimum five percent fall away from the house, and a great many Arlington yards do not have it — because landscaping was built up against the wall over the years, because a driveway or walk was poured sloping the wrong way, or because the lot was always lower than the one next door.

• Regrading. Mulch, stone, weed barrier and downspout trays come out of the work area, soil is cut or added, and a proper fall away from the house is tamped in.
• Downspout extensions. Run well clear of the foundation — ten feet where the lot allows, which on a narrow Arlington lot often means a buried line to the street side or a pop-up emitter.
• Missing downspouts. An elevation with no downspout at all drops roof water straight to the ground at the wall; adding gutters and downspouts is the cheapest foundation protection there is — see gutter repair, cleaning and downspouts.
• Water from next door. A higher neighboring yard, a retaining wall steering flow toward your house, or two downspout systems discharging into the same low corner. The fix is a swale five to seven feet out feeding a pop-up drain, or a channel drain across the affected side.
• Cracked slabs, stoops and walks that pitch water toward the house are corrected under concrete, walkway and step repair once the water has somewhere else to go.

Arlington County permits for foundation, underpinning and bracing work

Arlington is a county in its own right with no incorporated towns inside it, so there is one permit office and no Fairfax County involvement. Permits are issued by the Arlington County Inspection Services Division, on 703-228-3800, and every application is filed online through Permit Arlington.

For foundation work the line falls here: regrading, downspout extensions, crack injection, resurfacing and crawl space clean-out and vapor barrier are maintenance and need no permit. Underpinning, helical piers, steel bracing of a bowing wall, cutting a new access opening, replacing sections of wall and interior drain tile with a sump are structural or plumbing work and are permitted, usually with the engineer's drawings attached to the application. We file under our contractor license, perform the work to the Virginia building code, and the final portion of the contract waits for the county inspection. Because filing is online rather than over a counter, the practical constraint on a start date is review turnaround, which is allowed for in the schedule. The Arlington service area page covers the County's arrangements for every trade.

Bowing walls, underpinning and interior drains in Arlington basements

When the classification comes back structural, the repair is built to the engineer's specification and in the engineer's sequence.

Underpinning a settling wall

New bearing at a depth the soil can carry, either by extending the footing down in sections or by helical piers. Excavation runs in numbered, alternating sections no wider than forty-eight inches, never two adjacent sections open at once, by hand tools — that sequence is what stops the repair from undermining the wall it is saving.

Bracing a bowing wall

Steel columns set on new footings and bolted to the floor joists above with blocking between them, coated against rust, with cement packed behind. Bracing without dealing with the water that pushed the wall treats the symptom, so an interior drain tile and sump normally go in with it — see sump pump repair.

A settled corner or pier

Temporary support, the corner jacked back to level, the pier or pillar rebuilt on a gravel bed at least eight inches deep.

Finishing afterwards

Where the basement is to be finished once the wall is sound, walls are framed on pressure-treated plates against a coated wall — see basement finishing.

Foundation repair in Arlington is not quoted by phone and prices are not published; a crack injection and a staged underpinning are different by an order of magnitude, and only an inspection — sometimes an engineer's report — tells which you have. An estimator comes to the house, looks at the grade, the downspouts, the walls and the crawl space, and gives you a written price before work begins, or tells you plainly that an engineer should see it first. Sam & Sons Services LLC has worked across Northern Virginia and Washington DC since 1999 under Virginia DPOR class A contractor license #2705070610; the phone is answered 24 hours a day on (703) 256-8080.