Class Code 5447
Wallboard Installation – High Wage
Class Code 5447 covers high-wage workers who install wallboard (drywall, gypsum board, cement board and similar sheet products) on construction and tenant-improvement jobs in California. The approved pure premium rate for this classification is $3.249 per $100 of payroll, which helps determine baseline workers' compensation costs. Understanding the specific operations and hazards for wallboard installers helps employers control claims and stay Cal/OSHA compliant.
What Class Code 5447 Covers
This classification applies to on-site installation of wallboard products including gypsum/drywall panels, plasterboard, cement backerboard and similar sheathing used for interior walls and ceilings. Work covered includes transporting, staging, lifting and positioning large wallboard sheets, cutting and trimming panels to fit openings, fastening boards to metal studs or wood framing, and the use of mechanical lifts, scaffolds, ladders and hand or power fastening tools. The high-wage designation reflects payroll tiers rather than different duties; it is applied when payroll for the covered employees falls into a higher wage band used by WCIRB for rating. Typical projects include new construction, commercial tenant improvements, multi-family and higher-end residential retrofit work where experienced installers or union journeymen earn higher wages.
Who It Applies To
- Commercial drywall contractors performing interior wall and ceiling installations
- Specialty interior finish subcontractors on tenant-improvement and retrofit jobs
- Journeyman and high-wage drywall installers (union or highly experienced crews)
- Fit-out and millwork contractors who self-perform wallboard installation
- General contractors who employ in-house drywall crews on large projects
Common Job Duties
- Lifting, carrying and positioning 4x8 to 4x12 wallboard sheets using two-person teams or mechanical lifts
- Measuring, marking and cutting panels with utility knives, rotary saws or scoring tools
- Fastening boards to wood or metal studs using screw guns, nail guns or adhesive where specified
- Erecting, working from and moving scaffolds, man-lifts, and ladders while securing materials
- Staging and transporting bundles of wallboard on jobsite floors or via forklifts and trucks
- Coordinating with framers, electricians and plumbers to sequence openings and penetrations
Common Injury Risks
Understanding the $3.249 Rate
The pure premium rate of $3.249 is the insurer's loss-cost estimate expressed per $100 of payroll and represents the portion of premium allocated to expected claim costs. Insurers multiply this base loss cost by their expense, profit and contingency multipliers and add fixed policy charges to calculate the final insurer premium; employers also see adjustments from experience modification factors, schedule ratings, policy deductibles and audits. Payroll classification, accurate reporting of hours and correct employee classification between 'high wage' and other tiers will directly affect premium calculations.
Cal/OSHA Compliance Requirements
Wallboard installation is governed by Cal/OSHA Construction Safety Orders covering fall protection, scaffold safety, ladder use, and tool safety; employers must provide fall protection when exposures meet trigger heights and ensure scaffold erection and use follow regulations. Cutting cement-based backerboard and other activities that generate dust fall under Cal/OSHA's respirable crystalline silica and dust control requirements—employers must implement controls (wet methods, local exhaust ventilation, or respirators where required) and provide training, medical surveillance when applicable. General Cal/OSHA requirements for PPE, hazard communication for joint compounds/adhesives, and heat illness prevention for outdoor staging also apply.
How Key HR Helps Employers Under Class Code 5447
A PEO like Key HR can help employers in this classification by ensuring correct classification and payroll reporting, implementing targeted safety programs (manual handling training, scaffold and ladder protocols, silica exposure controls), and delivering centralized claims management to speed return-to-work. Key HR's pooled buying power and loss control services can lower insurance multipliers and provide disciplined safety audits, training, and post-injury light-duty placement to reduce total workers' comp costs.
Get a QuoteFrequently Asked Questions
Does wallboard taping and finishing fall under Class Code 5447?
Taping and finishing (joint compound application, sanding, texturing) are often handled under separate WCIRB classifications or designated as ancillary operations; whether those duties are included in 5447 depends on how your payroll and duties are reported. Confirm with your insurer or PEO to ensure finishing crew wages are classified correctly to avoid misclassification.
How can I reduce my workers' comp premium for high-wage wallboard installers?
Focus on injury prevention: implement safe lifting protocols, use mechanical lifts, provide scaffold and ladder training, control dust with wet cutting and LEV, and maintain a formal return-to-work program. Improving your experience modification, using safety incentive programs, and having accurate payroll reporting through a PEO can materially lower your effective premium.
What specific respiratory protections are required when cutting backerboard on site?
When cutting cement-based or silica-containing boards, employers must evaluate exposure and implement engineering controls like wet cutting or local exhaust ventilation. If controls do not reduce exposure below permissible limits, provide respirators, medical surveillance, fit-testing and training per Cal/OSHA silica and respiratory protection requirements.
Quick Facts
- Class Code
- 5447
- Classification
- Wallboard Installation – High Wage
- Pure Premium Rate
- $3.249 / $100 payroll
- Effective Date
- September 1, 2026
- Source
- WCIRB Approved Filing
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