2022 NAICS national industry in sector 42 Wholesale Trade
423330 Roofing, Siding, and Insulation Material Merchant Wholesalers
NAICS 423330 is the US industry code for roofing, siding, and insulation material merchant wholesalers. It covers establishments primarily engaged in the merchant wholesale distribution of nonwood roofing and nonwood siding and insulation materials.
- Code
- 423330 (2022 NAICS)
- Title
- Roofing, Siding, and Insulation Material Merchant Wholesalers
- Part of
- Lumber and Other Construction Materials Merchant Wholesalers
- SBA small business limit
- Up to 225 employees
- Closest UK SIC
- 46630 (details)
Changes coming. The NAICS 2027 revision applies to data from 1 January 2027, and SBA proposed new size standards on 20 August 2026. The values on this page are the ones in force today; we update this page when the official files change.
Official definition
This industry comprises establishments primarily engaged in the merchant wholesale distribution of nonwood roofing and nonwood siding and insulation materials.
When to use a different code
Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:
- 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.
Activities listed under 423330
The Census index assigns these 19 activities to this code. If your business matches one, this is your code.
- Asphalt felts and coatings merchant wholesalers
- Asphalt roofing shingles merchant wholesalers
- Ceramic and clay roofing materials merchant wholesalers
- Eavestroughing merchant wholesalers
- Fascia, building (except wood), merchant wholesalers
- Gutters and down spouts (except wood) merchant wholesalers
- House wrapping insulation materials merchant wholesalers
- Insulation materials (except wood) merchant wholesalers
- Roofing materials (except wood) merchant wholesalers
- Sheet metal roofing materials merchant wholesalers
- Shingles (except wood) merchant wholesalers
- Siding (except wood) merchant wholesalers
- Soffit, building (except wood), merchant wholesalers
- Solar reflective film merchant wholesalers
- Sound insulation merchant wholesalers
- Tarred felts merchant wholesalers
- Thermal wrap, house, merchant wholesalers
- Vinyl siding merchant wholesalers
- Weatherstripping merchant wholesalers
SBA size standard for 423330
To count as a small business for SBA loans and federal contracts under NAICS 423330, your business (including affiliates) must not exceed 225 employees. Check your business.
Source: SBA table of size standards, effective March 17, 2023.
Closest UK SIC 2007 codes
There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 4663), so treat them as a starting point and check the definition.
Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.
Similar codes to compare
Data last changed November 14, 2026. How this page is built.