Who are we?

The Master Insulators’ Association of Ontario is an accredited bargaining agency with the Ontario Labour Relations Board representing the Unionized Mechanical Insulation Contractors working in Ontario.

Founded in 1942, the MIAO is a not-for-profit organization working towards the advancement and betterment of the Heat & Frost Insulation Industry while promoting the highest standards of safety, workmanship and ethical business practices.

As well as the Unionized Mechanical Insulation Contractors of Ontario, members of the MIAO include the Manufacturers and Suppliers of materials used in Commerical and Industrial insulation systems.

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How to join

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Currently in this section, you will find lists of the MIAO Board of Directors, the MIAO Committees and MIAO Affiliates.

The Directories will be updated shortly to include a searchable list of MIAO Active Members and Associates.

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Active Members

Associate Members

Board of Directors




Members’ Lounge

This section is password protected and for use by MIAO Active and Associate Members only.

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This website will be updated and modified with new content and features on a regular basis.

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