Micropile Installation In North Carolina

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Micropiles, also called minipiles, are small diameter piles. They are constructed by drilling a hole typically 2 to 8 inches in diameter deep into the soil, inserting a high-strength threaded bar or pipe and then filling the hole with high-strength grout.

Primarily, micropiles are designed to take advantage of the friction developed where the grout and soil interface, but they can also incorporate some end-bearing capacity when drilled into competent strata or socketed into rock. Soil conditions and capacity requirements dictate hole size and depth as well as reinforcing type.

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Applications for Micropile Installation

Micropiles are typically used when ground conditions will not support the full load of construction or to strengthen the foundation of an existing structure. For example, they may be utilized when building in an area with unstable soils or various obstructions.

Micropiles are suitable for a range of conditions throughout the Southeast, including:

  • Deep foundations in difficult soil conditions
  • Temporary or permanent structural underpinning
  • Supporting heavy loads in congested areas
  • Mitigating foundation settlement
  • Excavation support in confined spaces

Drilling and Installing Micropiles


Many times, especially in clay soils, an open hole drilling method for micropile installation can be used. This simply means the soil is stiff enough to remain open during the entire operation of drilling, bar placement and grouting. Grouted micropiles are always installed from the bottom up using a tremie tube.
It is sometimes necessary to install temporary or permanent casing through the soft overburden to keep the soils from collapsing during micropile installation. This drastically slows down the installation process and increases the cost. Alternatively, Foundation Repair Services can install hollow bar injection anchors when dealing with soft collapsing soils.

Hollow bar micropiles are constructed by injecting grout through a hollow steel bar and bit during the drilling process. The grout serves to stabilize the hole and flush the cuttings out during drilling. The hollow bar and bit serve as the drill string during installation and as the permanent reinforcement in the pile after completion.

This drilling method has several advantages. They include the speed of installation and the ability to achieve high capacities with relatively small piles.

Why Choose Foundation Repair Services?

We’re proud to be the micropile contractor of choice for homeowners, builders and contractors throughout the region. We serve North CarolinaSouth Carolina and Eastern Tennessee. As a fully licensed foundation repair contractor, we’re dedicated to providing the highest levels of professionalism and expertise in all the work we do. Our focus is always on delivering effective, efficient solutions for our clients, from small repairs to complex, large-scale projects.

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