Division B
Acceptable Solutions

Part 5 — Environmental Separation

(See Appendix A.)  (See Part 10)

[Rev. 2, B.C. Reg. 73/2008.]

Section 5.4. Air Leakage

5.4.1. Air Barrier Systems

5.4.1.1. Required Resistance to Air Leakage
(See Appendix A.)

1) Where a building component or assembly separates interior conditioned space from exterior space, interior space from the ground, or environmentally dissimilar interior spaces, the properties and position of the materials and components in those components or assemblies shall be such that they control air leakage or permit venting to the exterior so as toI

a) provide acceptable conditions for the building occupants,

b) maintain appropriate conditions for the intended use of the building,

c) minimize the accumulation of condensation in and the penetration of precipitation into the building component or assembly,

d) control heat transfer to roofs where ice damming can occur, and

e) not compromise the operation of building services.

2) [ . . . ] An air barrier system shall be installed to provide the principal resistance to air leakage.I

3) Deleted.

5.4.1.2. Air Barrier System Properties

1) [ . . . ] Materials intended to provide the principal resistance to air leakage shall have an air leakage characteristic not greater than 0.02 L/(s•m2) measured at an air pressure difference of 75 Pa. (See Appendix A.)I

2) Deleted.

3) The air barrier system shall be continuousI

a)across construction, control and expansion joints,

b)across junctions between different building assemblies, and

c)around penetrations through the building assembly.

4) The structural design of air barrier systems installed in assemblies subject to air pressure loads shall comply with Article 5.1.4.1. and Subsection 5.2.2.I