Past Unstable Soil, Down to Bearing Capacity
Deep Foundation
Systems
in Maryland
The engineering category of repair methods that reach past unstable shallow soil to bearing capacity below
When shallow soil can no longer bear a settled foundation's load, deep foundation elements, piers and piles driven or drilled down to competent strata, are the category of repair that reaches it. OBW diagnoses whether your foundation's settlement calls for this category and which specific method fits.
Depth as the Defining Feature
What Sets Deep Foundation
Systems Apart
Shallow foundation repairs, crack sealing, drainage correction, grout injection, work at or near the surface. A deep foundation system is different in kind: it's an element, typically a pier or pile, driven or drilled down to soil that can actually bear the structure's load, sometimes well below where the original footing was built. This category matters when the settlement problem is that the entire shallow soil zone has lost bearing capacity, not just a localized void.
In Maryland, this usually points back to Piedmont clay's long-term consolidation or shrink-swell behavior undermining shallow footings built decades ago. Push piers are OBW's own in-house deep foundation method; helical piers and micro piles are additional methods explained on their own pages for the situations they fit.
Settlement that has reached a scale calling for a deep foundation system rather than a shallow fix
Shallow Fix or Deep Foundation?
When the Category
Actually Applies
- Significant differential settlement across a wide section of foundation, not a small localized void
- Shallow soil that has consistently failed to support the structure over years, not a one-time drainage event
- A soil assessment showing competent bearing strata only exists at meaningful depth
Deep Foundation Methods
What Falls Under This Category
Push Piers
OBW's in-house deep foundation method for many Maryland residential settlement patterns, driven using the structure's own weight.
Helical Piers and Micro Piles
Additional deep foundation methods explained in their own educational guides, suited to different structures and access.
Depth to Bearing Soil
In central Maryland, competent bearing strata below the frost line is typically found at meaningful depth, confirmed for your site through inspection.
Repair Scope Only
OBW's deep foundation work addresses existing settled structures. We do not perform new construction deep foundation installation.
Common Questions
Deep Foundation Questions from
Maryland Homeowners
What's the difference between deep foundation systems and foundation underpinning?
The terms overlap, but underpinning describes the repair goal, extending an existing settled foundation's support to soil that can bear the load. Deep foundation systems describes the engineering category of methods that reach significant depth to find that bearing capacity, piers, piles, and similar deep elements as a group, distinguished from shallow foundation repairs that work at or near the surface.
In practice, most of the deep foundation work OBW discusses is underpinning an existing settled structure. We do not build new foundations or perform new construction deep foundation work, our scope is repair.
When does a Maryland foundation repair need a deep foundation system rather than a shallower fix?
When the soil near the surface, the shallow zone an original footing was built on, no longer has the bearing capacity to hold the structure, and that condition extends deep enough that shallow fixes like grout injection can't reach competent soil. At that point, a deep foundation element, a pier or pile driven or drilled down to bearing strata, is the appropriate category of repair.
OBW's inspection determines depth to competent soil as part of diagnosing settlement, which is what tells us whether the situation calls for a deep foundation system and which specific method within that category fits.
Why Oriole
Why Maryland Homeowners Trust
OBW's Foundation Diagnosis
Depth Confirmed, Not Assumed
We determine how deep competent bearing soil is at your site before recommending a specific deep foundation method.
Written Workmanship Guarantee
OBW's own in-house deep foundation work is backed by a written workmanship guarantee, terms vary by service, ask your inspector.
No Subcontracting
OBW's own crew performs push pier installations in-house, no labor brokers, no subcontracted trade teams.
Family-Owned Since 1953
Founded by Frank Pirog Sr. in 1953. Amber Pirog leads the company today.
Significant Settlement? Get It Assessed.
Free inspection. Honest recommendation on whether your foundation calls for a deep foundation system.
Family-owned since 1953 · MHIC #4247 · Written Workmanship Guarantee