The Ontario Building Code | Coverings, Linings and Insulation

6.2.4.8. Coverings, Linings and insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation

(1) Foamed plastic insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation may be used in a ceiling space that acts as a return air plenum, provided the foamed plastic insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation is protected from exposure to the plenum in accordance with Article 3.1.5.12.

(2) Linings of ducts shall be installed so that they will not interfere with the operation of volume or balancing dampers.