Lather (Interior Systems Mechanic)

A Lather (Interior Systems Mechanic) performs job layout using blueprints, and installs, handles, erects and applies materials that are component parts in the construction of ceilings and walls. Lathers install support frameworks for ceiling systems, interior and exterior walls, build interior partitions and install drywall and other sheathing on walls and ceilings. They also install curtain walls, fire and sound systems, acoustical installations, access flooring, demountable partitions, shielded walls, and apply building envelope technologies. Lathers (Interior Systems Mechanic) were previously designated as Wall and Ceiling Installers in BC.

Record Book

Program Updates:

Standardized Level Exam (SLE) Updates

  • The Harmonized Level Exams are in development

SLE Weighting Charts

  • None

Interprovincial Exam Updates

  • None

Interprovincial Exam Information


Program Information

The documents below offer detailed information specific to this program.

  • Program Profile
  • Describes the requirements for apprentices and challengers to earn certification
  • Download(PDF 144.64 KB)
  • Program Outline
  • Guidelines for delivery of technical training at ITA Recognized Training Providers
  • Download(PDF 856.44 KB)

Challenge Certification/Recognize Prior Experience

If you have significant work experience in a trade but have never been certified in Canada, you may apply to challenge the certification.


If you sponsor apprentices but have never been certified in Canada, you may request to supervise and sign-off apprentices when they are ready to be certified. Please refer to the application form on whether this trade qualifies.

  • Instructions
  • How to Apply
  • Download(PDF 171.16 KB)
  • Application Form
  • Personal information and exams scheduling information (for challenge option)
  • Download(PDF 178.62 KB)
  • Employer Declaration
  • Document of relevant work experience
  • Download(PDF 254.4 KB)
  • Statutory Declaration
  • Attestation for self-employment/work experience when employer cannot be contacted
  • Download(PDF 301.97 KB)