How to Use This Drywall Resource
The National Drywall Authority functions as a structured reference point for the drywall and interior finishing sector across the United States — covering service providers, product categories, installation standards, and the regulatory frameworks that govern this trade. This page describes how content across the site is organized, verified, and maintained, and how the directory fits within a broader landscape of professional and regulatory sources. Readers navigating Drywall Listings or researching the scope of this platform through Directory Purpose and Scope will find this page useful for calibrating what the site provides and where its boundaries lie.
How content is verified
Content published on this site is developed through structured review against publicly available regulatory and industry standards. The primary reference frameworks include:
- ASTM International standards — particularly ASTM C36 (gypsum wallboard), ASTM C840 (application and finishing of gypsum board), and ASTM C954/C1002 (fastener specifications for steel framing applications).
- United States Gypsum (USG) technical documentation — product installation guides and system specifications from one of the largest North American gypsum manufacturers serve as cross-references for installation methodology.
- International Building Code (IBC) and International Residential Code (IRC) — published by the International Code Council (ICC), these codes define fire-resistance assembly requirements, partition construction criteria, and moisture-resistant board applications in habitable spaces.
- Occupational Safety and Health Administration (OSHA) — drywall installation involves silica dust exposure, fall hazards in multi-story construction, and scaffolding compliance. OSHA 29 CFR 1926 Subpart Q governs concrete and masonry construction in ways that intersect with interior framing; OSHA 29 CFR 1926.1153 addresses respirable crystalline silica in construction.
- Gypsum Association (GA) — publications including GA-216 (application and finishing of gypsum panel products) represent the industry's primary technical standard for installation finishing levels, including the 6-level finish system (Level 0 through Level 5).
Listings for service providers are drawn from publicly accessible business registrations, state contractor license databases, and trade association member directories. No listing constitutes an endorsement, and verification status is indicated at the listing level within Drywall Listings.
How to use alongside other sources
This platform covers the drywall service sector at a national scope, which means state-level licensing requirements, local permit authority interpretations, and jurisdiction-specific fire codes are not replicated here in full. The following source types provide essential supplementary context:
State contractor licensing boards — 48 states maintain licensing requirements for general or specialty contractors; drywall installation falls under specialty contractor classifications in states including California (CSLB C-9 Drywall license), Florida (DBPR), and Texas (TDLR). License verification should always be performed through the issuing state agency directly.
Local Authority Having Jurisdiction (AHJ) — the AHJ for any given construction project governs permit issuance, inspection sequencing, and code adoption. Drywall rough-in inspections — covering fire blocking, draft stopping, and shear wall sheathing — must be scheduled through the local building department before board installation proceeds in framing cavities.
Fire-rated assembly databases — UL's Online Certifications Directory and the Gypsum Association's Fire Resistance Design Manual (GA-600) maintain searchable records of tested and listed wall and ceiling assemblies. These resources are authoritative for selecting assemblies that meet IBC Table 601 fire-resistance requirements.
A comparison worth noting: Type X gypsum board (5/8-inch thickness, glass fiber reinforcement) versus Type C gypsum board (enhanced core formulation with additional glass fibers) — both are used in fire-rated assemblies, but Type C achieves higher fire-resistance ratings within the same thickness profile and is specified in UL-listed assemblies where Type X cannot meet the required rating. This distinction affects product selection on projects governed by IBC Section 722 or local fire codes.
Feedback and updates
The drywall sector is subject to ongoing standards revision. ASTM and the Gypsum Association publish updated editions of core standards on cycles that can affect installation specifications, fire-rated assembly listings, and product classification. State licensing thresholds, bond amounts, and continuing education requirements also change through legislative and regulatory action.
Factual corrections, outdated listing information, or requests to update business details can be submitted through the Contact page. Submissions are reviewed against primary source documentation before any content update is applied. Structural changes to content — such as revised code citations or updated licensing thresholds — follow a documented review cycle tied to published standard revision dates rather than calendar-driven schedules.
Purpose of this resource
The National Drywall Authority serves as a neutral reference structure for the interior finishing trade — not a contractor referral engine, not a product retailer, and not a licensing body. The Directory Purpose and Scope page documents the classification criteria used to organize listings and the geographic coverage model in detail.
The drywall sector in the United States encompasses a distinct division between commercial drywall contractors (working under LEED-certified assemblies, union labor agreements, and multi-trade coordination on projects governed by IBC) and residential drywall contractors (operating under IRC, local AHJ permit processes, and typically at smaller project scales with less regulatory layering). Both segments are represented in the directory.
For researchers, estimators, architects, or general contractors conducting vendor identification or standards review, this site functions as a structured entry point — not a replacement for primary regulatory sources, state licensing databases, or manufacturer technical documentation, but a consolidated reference that maps the sector's service providers and operational standards in one indexed location.