How to Use This Foundation Resource
National Foundation Authority is a structured reference directory covering the foundation construction and structural repair service sector across the United States. This page explains how the directory's content is organized, what scope it covers, how to locate specific topics or service providers, and what standards govern the information presented. Foundation work is among the most consequential and regulated categories in residential and commercial construction — understanding how this reference is structured helps professionals, researchers, and service seekers navigate it accurately.
How information is organized
Content across this directory is arranged around three primary axes: service category, regulatory context, and geographic scope.
Service categories reflect the established classification boundaries used within the structural construction trades:
- Deep foundation systems — driven piles, drilled shafts (caissons), helical piers, and micropiles governed by load-transfer-to-bedrock or load-transfer-to-competent-soil principles
- Shallow foundation systems — spread footings, mat/raft foundations, and slab-on-grade construction governed by bearing capacity at or near the surface
- Foundation repair and remediation — underpinning, crack injection, waterproofing, drainage correction, and soil stabilization
- Inspection and assessment services — structural engineering evaluations, geotechnical investigation, and permit-related inspections
These categories align with classifications used in the International Building Code (IBC), published by the International Code Council (ICC), and referenced by building departments across all 50 states. The IBC Chapter 18 addresses soils and foundations specifically, establishing the technical framework that licensed professionals and inspectors operate within.
Regulatory context is threaded throughout listing entries and topic pages. The Occupational Safety and Health Administration (OSHA) 29 CFR 1926 Subpart P governs excavation and trenching safety — a direct regulatory layer for foundation work — and OSHA 29 CFR 1926 Subpart Q covers concrete and masonry construction. Named standards from the American Concrete Institute (ACI) and the American Society of Civil Engineers (ASCE), including ASCE 7 for minimum design loads, are referenced where applicable.
Geographic scope is national. Listing entries are organized to support state-level filtering because licensing, permitting requirements, and code adoption vary by jurisdiction. A contractor licensed as a Registered Professional Engineer (PE) in one state may require reciprocal licensing before operating in another.
The Foundation Listings section is the primary access point for provider-level data.
Limitations and scope
This directory covers the structural foundation sector — not landscaping, grading, or general site preparation services except where those activities intersect directly with structural work. Specialty trades such as waterproofing membrane installation and radon mitigation are included only where they are performed as part of a foundation scope.
The directory does not provide engineering calculations, site-specific assessments, or legal interpretations of building codes. Permit requirements, setback rules, and soil classification standards differ at the county and municipal level; entries and topic pages identify governing regulatory bodies but do not substitute for jurisdiction-specific code review.
Insurance and warranty information referenced in listing profiles reflects self-reported data from service providers. Verification of active contractor licensing should be confirmed through the relevant state contractor licensing board — for example, the California Contractors State License Board (CSLB) or the Texas Department of Licensing and Regulation (TDLR), each of which maintains public license lookup tools.
Foundation work involving occupied structures carries risk categories recognized by OSHA and ICC that differ from new construction. This distinction is embedded in the content classification but does not constitute safety advisory guidance.
For a full description of what this reference covers and how it fits within the broader construction authority network, see Foundation Directory Purpose and Scope.
How to find specific topics
Three navigation paths are available within this reference:
- By service type — Users seeking information on a specific foundation method (helical pier installation, slab-on-grade repair, caisson drilling) can filter listings and topic content by service category using the taxonomy described above.
- By state or region — Geographic filters reflect the 50-state scope. Because code adoption of IBC editions varies — 46 states had adopted some version of the IBC as of the ICC's adoption tracking records — regulatory framing within each state entry reflects the locally adopted standard where identifiable.
- By regulatory or standards reference — Topic pages referencing specific code sections (IBC Chapter 18, ACI 318, ASCE 7) are cross-indexed to allow researchers to locate content organized around a named standard rather than a service type.
The Foundation Listings directory allows filtering by state and service category. The How to Use This Foundation Resource page — the current page — serves as the structural reference for navigating all other sections.
How content is verified
Listing data is sourced from publicly available business records, state contractor license databases, and direct provider submissions. Entries undergo a baseline verification pass against state licensing board records before publication. License status is subject to change; the directory flags the date of last verification on individual listing profiles.
Topic and regulatory content is grounded in named primary sources: ICC model codes, OSHA federal regulations published in the Code of Federal Regulations (CFR), ACI standards, and ASCE technical documents. Interpretive claims are not made. Where a standard or code is cited, the citation references the named document — no paraphrasing is presented as authoritative legal or engineering interpretation.
Content reflecting geotechnical concepts — soil bearing capacity classifications, liquefaction risk zones, expansive soil designations — is aligned with U.S. Geological Survey (USGS) public data and FEMA flood and seismic hazard maps where applicable. FEMA's National Flood Insurance Program (NFIP) flood zone designations intersect with foundation design requirements in coastal and riparian jurisdictions and are referenced accordingly.
Pricing data, where present in listing profiles, is not verified for accuracy and is displayed as self-reported reference ranges only. Structural cost benchmarks, when cited in topic content, are attributed to named industry sources such as RSMeans construction cost data.