This consultation was open from:
January 22, 2026
to March 8, 2026
Decision summary
An Environmental Compliance Approval with Limited Operational Flexibility (air & noise) was granted to Owens Corning Insulating Systems Canada GP Inc., for its Scarborough site located at the 3450 McNicoll Avenue, Toronto, Ontario.
The facility production limit is 240 tonnes of bare molten glass per day.
Location details
Site address
3450 McNicoll Avenue
Toronto,
ON
Canada
Site location map
The location pin reflects the approximate area where environmental activity is taking place.
View this location on a map opens link in a new windowProponent(s)
Owens Corning Insulating Systems Canada GP Inc., as general partner for and on behalf of Owens Corning Insulating Systems Canada
3450 McNicoll Avenue
Toronto,
ON
M1V 1Z5
Canada
Decision details
An Environmental Compliance Approval with Limited Operational Flexibility (air & noise) was granted to Owens Corning Insulating Systems Canada GP Inc., for its Scarborough site located at the 3450 McNicoll Avenue, Toronto, Ontario.
The facility production limit is 240 tonnes of bare molten glass per day.
The application includes all sources at the facility, including:
- dust collectors
- tanks
- cooling towers
- furnaces
- oven
- paint spray booth
- heaters and boilers
- regenerative thermal oxidizer
- wet electrostatic precipitators
Emissions into the air from this facility include:
- nitrogen oxides,
- crystalline silica,
- particulate matter
- manganese compounds
- chromium compounds
- odour
- lead
- nickel
The Environmental Compliance Approval with Limited Operational Flexibility (air & noise) requires that the company demonstrate compliance on an ongoing basis with Ontario Regulation 419/05, applicable Ministry Guidelines for Air and Noise and other performance requirements as specified in their conditions. It permits modifications such as process changes, de-bottlenecking or addition of new equipment subject to limits on operational flexibility that include a production limit for the facility to be specified on Environmental Compliance Approval with Limited Operational Flexibility (air & noise).
The Limited Operational Flexibility conditions will expire on December 31, 2028, unless this Approval is revoked prior to the expiry date. The company will be required to make application for amendment at that time to renew these conditions. Of specific public interest, one condition that is included with the Environmental Compliance Approval with Limited Operational Flexibility (air & noise) requires the company to make available, at all times, at the facility for inspection by interested members of the Public, a table (emission summary table) that documents the facility’s compliance with Ontario Regulation 419/05.
Supporting materials
View materials in person
Some supporting materials may not be available online. If this is the case, you can request to view the materials in person.
Get in touch with the office listed below to find out if materials are available.
135 St Clair Ave West
1st Floor
Toronto,
ON
M4V 1P5
Canada
How to Appeal
This instrument decision can be appealed. You have 15 days from July 17, 2026 to begin the appeal process.
Carefully review the information below to learn more about the appeal process.
How to appealClick to Expand Accordion
Start the process to appeal
If you’re an Ontario resident, you can start the process to appeal this instrument decision.
First, you’ll need to seek leave (i.e. get permission) from the relevant appellate body to appeal the decision.
If the appellate body grants leave, the appeal itself will follow.
Seek leave to appeal
To seek leave to appeal, you need to do these three things:
- prepare your application
- provide notice to the minister
- mail your application to three parties
1. Prepare your application
You’ll need to prepare an application. You may wish to include the following things in your application:
- A document that includes:
- your name, phone number, fax number (if any), and/or email address
- the ERO number and ministry reference number (located on this page)
- a statement about whether you are a resident in Ontario
- your interest in the decision, and any facts you want taken into account in deciding whether you have an interest in the decision
- the parts of the instrument that you’re challenging
- whether the decision could result in significant harm to the environment
- the reason(s) why you believe that no reasonable person – having regard to the relevant law and to any government policies developed to guide decisions of that kind – could have made the decision
- the grounds (facts) you’ll be using to appeal
- the outcome you’d like to see
- A copy of the instrument (approval, permit, order) that you you are seeking leave to appeal. You’ll find this in the decision notice on the Environmental Registry
- Copies of all supporting documents, facts and evidence that you’ll be using to appeal
What is considered
The appeal body will consider the following two questions in deciding whether to grant you leave to appeal:
- is there is good reason to believe that no reasonable person, with respect to the relevant law and to any government policies developed to guide decisions of that kind, could have made the decision?
- could the decision you wish to appeal result in significant harm to the environment?
2. Provide your notice
You’ll need to provide notice to the Minister of the Environment, Conservation and Parks that you’re seeking leave to appeal.
In your notice, please include a brief description of the:
- decision that you wish to appeal
- grounds for granting leave to appeal
You can provide notice by email at minister.mecp@ontario.ca or by mail at:
College Park 5th Floor, 777 Bay St.
Toronto, ON
M7A 2J3
3. Mail your application
You’ll need to mail your application that you prepared in step #1 to each of these three parties:
- appellate body
- issuing authority (the ministry official who issued the instrument)
- proponent (the company or individual to whom the instrument was issued)
Owens Corning Insulating Systems Canada GP Inc., as general partner for and on behalf of Owens Corning Insulating Systems Canada
3450 McNicoll Avenue
Toronto,
ON
M1V 1Z5
Canada
Registrar, Ontario Land Tribunal
655 Bay Street, Suite 1500
Toronto, Ontario
M5G 1E5
(416) 212-6349
(866) 448-2248
OLT.Registrar@ontario.ca
Include the following:
This is not legal advice. Please refer to the Environmental Bill of Rights for exact legal requirements. Consult a lawyer if you need help with the appeal process.
Connect with us
Contact
Client Services and Permissions Branch
135 St Clair Ave West
1st Floor
Toronto,
ON
M4V 1P5
Canada
Original proposal
Proposal details
This proposal is for an amendment and renewal to the Limited Operational Flexibility for an Environmental Compliance Approval (air & noise) No. 9909-9DGPA5 for Owens Corning Insulating Systems Canada GP Inc., as general partner for and on behalf of Owens Corning Insulating Systems Canada LP, a fiberglass insulation manufacturing facility located in the City of Toronto, Ontario.
The emission sources from the manufacturing and associated processes that discharge to the air include:
- dust collectors
- tanks
- cooling towers
- furnaces
- oven
- regenerative thermal oxidizer and paint spray booth
The amendment includes decreasing the maximum rate of production per day from 302 tonnes to 240 tonnes of bare molten glass and includes proposed modifications to the facility including the addition of emission control equipment.
Emissions to the air from this facility include:
- silica-respirable
- manganese compounds
- nitrogen oxides
- chromium (VI) compounds
- nickel
- lead
- benzene
- particulate matter; and
- sulphur dioxide
The Environmental Compliance Approval with Limited Operational Flexibility (air), when issued, permits modifications to the facility subject to limits on operational flexibility that include a production limit for the facility to be specified on the Environmental Compliance Approval with Limited Operational Flexibility (air). The Limited Operational Flexibility conditions have an expiry date. The company will be required to make an application for amendment at that time to renew these conditions.
Supporting materials
View materials in person
Some supporting materials may not be available online. If this is the case, you can request to view the materials in person.
Get in touch with the office listed below to find out if materials are available.
135 St Clair Ave West
1st Floor
Toronto,
ON
M4V 1P5
Canada
Comment
Commenting is now closed.
This consultation was open from January 22, 2026
to March 8, 2026
Connect with us
Contact
Client Services and Permissions Branch
135 St Clair Ave West
1st Floor
Toronto,
ON
M4V 1P5
Canada
Comments received
Through the registry
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