Drilled Pier Foundation Components for New Home Construction

Component Summary

Floor System

Subfloor sheathing and framing provide the base for flooring and distribute loads to the beams.

Rim / Band Beam

Runs around the perimeter, ties the floor system together, and transfers loads to the piers.

Floor Joists

Span between beams; support the subfloor and live loads from the home.

Main Beam (Girder)

Supports floor joists and transfers loads down to the piers.

Beam Pocket / Hanger

Provides a positive connection between joists and beams for strength and stability.

Post (Optional)

Posts may be used under beams for additional support on long spans or heavy loads.

Drilled Pier (Shaft)

Concrete column drilled below the frost line to reach competent soil or bedrock.

Rebar Cage

Steel reinforcement inside the pier adds strength and helps the concrete resist tension and bending.

Bell Footing

Widened pier base increases bearing capacity and helps prevent settlement and uplift.

Compacted Gravel Base

Provides a stable, level surface for the bell footing and helps with drainage and load distribution.

Ground

Piers extend below the frost line into stable soil or bedrock to properly support the structure.

Bracing (As Needed)

Diagonal or cross bracing may be installed between piers or posts to resist lateral loads and improve stability.

Termite Shield

Metal shield installed between concrete piers and wood beams to help prevent termite access.

Ventilation

Openings or vents in the foundation area allow air circulation to reduce moisture and protect the structure.

Why Use Drilled Pier Foundations?

Ideal for sloped or uneven sites.
Reduces excavation and concrete use.
Minimizes impact on the landscape.
Provides excellent strength and stability.

Typical Installation Steps

Layout and mark pier locations.
Drill holes to the required depth and diameter.
Place the rebar cage.
Pour concrete and finish the pier top.
Install beams, joists, and the floor system.

Important Notes

Engineering is recommended to determine pier size, depth, and spacing based on soil conditions and loads.
Provide proper drainage and site grading away from the foundation.
Follow all local building codes and permitting requirements.

Common Pier Diameters

Typical drilled pier diameters include 12", 14", 16", 18" or larger, depending on structural loads, soil conditions, frost depth, and local engineering requirements.

Always verify final pier size, depth, reinforcement, and spacing with your engineer and local building department.

Build on stable ground.

A well-designed drilled pier foundation can provide a strong, level base for new homes on sloped, uneven, or expansive-soil sites.

Why Use Drilled Pier Foundations?

Typical Installation Steps

Important Notes

Common Pier Diameters

Build on stable ground.

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