The Ontario Building Code | Properties to Resist Heat Transfer or Dissipate Heat
5.3.1.2. Properties to Resist Heat Transfer or Dissipate Heat
(1) Materials and components installed to provide the required resistance to heat transfer or the means implemented to dissipate heat shall,
(a) provide sufficient resistance or dissipation,
(i) to minimize surface condensation on the warm side of the component or assembly,
(ii) in conjunction with other materials and components in the assembly, to minimize condensation within the component or assembly,
(iii) in conjunction with systems installed for space conditioning, to meet the interior design thermal conditions for the intended occupancy, and
(iv) to minimize ice damming on sloped roofs, and
(b) take into account the conditions on either side of the environmental separator.
In Plain Language
This clause lists what building materials and components must accomplish to control heat transfer and condensation: minimizing surface condensation, minimizing condensation within the assembly, meeting interior comfort conditions given the space-conditioning systems installed, and reducing ice damming on sloped roofs, all while accounting for conditions on both sides of the assembly.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.