423330 — Roofing, Siding, and Insulation Material Merchant Wholesalers
Description
This industry comprises establishments primarily engaged in the merchant wholesale distribution of nonwood roofing and nonwood siding and insulation materials (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Exclusions & Cross-References
- Establishments primarily engaged in the merchant wholesale distribution of wood roofing and wood siding are
- classified in Industry 423310, Lumber, Plywood, Millwork, and Wood Panel Merchant Wholesalers.
Overview Facts
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 5033 - Roofing, Siding, and Insulation Materials (via SIC1987:5033→NAICS1997:42133→2002:423330→2007:423330→2012:423330→2017:423330→2022:423330)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC 5650 — Roofing and Siding Materials
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 423330 valid in 2022? ▾
Yes, 423330 is a valid 6-digit 2022 NAICS national industry code representing 'Roofing, Siding, and Insulation Material Merchant Wholesalers' under Sector 42 in the official classification index.
What is the SBA size standard for NAICS code 423330? ▾
The Small Business Administration (SBA) has established a small business size standard of 225 employees for NAICS code 423330 (Roofing, Siding, and Insulation Material Merchant Wholesalers), calculated based on employees.
What is the legacy SIC equivalent for NAICS 423330? ▾
According to official Census Bureau concordance tables, NAICS code 423330 (Roofing, Siding, and Insulation Material Merchant Wholesalers) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 5033 - Roofing, Siding, and Insulation Materials.
Related Pages & Tools
Further regulatory reference links for NAICS code 423330:
- Sector 42 Directory Hub — List of related industries in the Wholesale Trade sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 423330 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Roofing, Siding, and Insulation Material Merchant Wholesalers).
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.