The British Columbia Building Code | Section 5.3. | Heat Transfer
Division B: Acceptable Solutions Part 5 – Environmental Separation
British Columbia Building Code 2018 Division B
Section 5.3. Heat Transfer
(See Note A-5.3.)
5.3.1. Thermal Resistance of Assemblies
5.3.1.1. Required Resistance to Heat Transfer
(See Note A-5.3.1.1.)
1) Except as provided in Sentence(2), where a building component or assembly will be subjected to an intended
temperature differential, the component or assembly shall include materials to resist heat transfer or a means to
dissipate transferred heat in accordance with the remainder of this Subsection.
2) The installation of materials to resist heat transfer in accordance with the remainder of this Subsection is not
required where it can be shown that uncontrolled heat transfer will not adversely affect any of
a) the health or safety of building users,
b) the intended use of the building, or
c) the operation of building services.
5.3.1.2. Properties to Resist Heat Transfer or Dissipate Heat
(See Note A-5.3.1.2.)
1) Taking into account the conditions on either side of the environmental separator, materials and components
installed to provide the required resistance to heat transfer or the means implemented to dissipate heat shall provide
sufficient resistance or dissipation,
a) to minimize surface condensation on the warm side of the component or assembly,
b) in conjunction with other materials and components in the assembly, to minimize condensation within the
component or assembly,
c) in conjunction with systems installed for space conditioning, to meet the interior design thermal conditions
for the intended occupancy, and
d) to minimize ice damming on sloped roofs.
(See Note A-5.3.1.2.(1).)
5.3.1.3. Location and Installation of Materials Providing Thermal Resistance
1) Where a material required by Article 5.3.1.1. is intersected by a building assembly, penetrated by a high
conductance component or interrupted by expansion, control or construction joints, and where condensation is
likely to occur at these intersections, penetrations or interruptions, sufficient thermal resistance shall be provided so
as to minimize condensation at these locations.
2) Materials providing required thermal resistance shall have sufficient inherent resistance to airflow or be
positioned in the assembly so as to prevent convective airflow through and around the material.
(See Note A-5.3.1.3.(2).)
Division B: Acceptable Solutions Part 5 – Environmental Separation
British Columbia Building Code 2018 Division B
Section 5.3. Heat Transfer
(See Note A-5.3.)
5.3.1. Thermal Resistance of Assemblies
5.3.1.1. Required Resistance to Heat Transfer
(See Note A-5.3.1.1.)
1) Except as provided in Sentence(2), where a building component or assembly will be subjected to an intended
temperature differential, the component or assembly shall include materials to resist heat transfer or a means to
dissipate transferred heat in accordance with the remainder of this Subsection.
2) The installation of materials to resist heat transfer in accordance with the remainder of this Subsection is not
required where it can be shown that uncontrolled heat transfer will not adversely affect any of
a) the health or safety of building users,
b) the intended use of the building, or
c) the operation of building services.
5.3.1.2. Properties to Resist Heat Transfer or Dissipate Heat
(See Note A-5.3.1.2.)
1) Taking into account the conditions on either side of the environmental separator, materials and components
installed to provide the required resistance to heat transfer or the means implemented to dissipate heat shall provide
sufficient resistance or dissipation,
a) to minimize surface condensation on the warm side of the component or assembly,
b) in conjunction with other materials and components in the assembly, to minimize condensation within the
component or assembly,
c) in conjunction with systems installed for space conditioning, to meet the interior design thermal conditions
for the intended occupancy, and
d) to minimize ice damming on sloped roofs.
(See Note A-5.3.1.2.(1).)
5.3.1.3. Location and Installation of Materials Providing Thermal Resistance
1) Where a material required by Article 5.3.1.1. is intersected by a building assembly, penetrated by a high
conductance component or interrupted by expansion, control or construction joints, and where condensation is
likely to occur at these intersections, penetrations or interruptions, sufficient thermal resistance shall be provided so
as to minimize condensation at these locations.
2) Materials providing required thermal resistance shall have sufficient inherent resistance to airflow or be
positioned in the assembly so as to prevent convective airflow through and around the material.
(See Note A-5.3.1.3.(2).)