(See Appendix A.) (See Part 10)
[Rev. 2, B.C. Reg. 73/2008.]
1) This Part is concerned with
a)the control of condensation
i)in building components and assemblies, and
ii)on building materials, components and assemblies, and
b)the transfer of heat, air, moisture and sound through
i) building materials, components and assemblies, and
ii)interfaces between building materials, components and assemblies.
(See Appendix A.)1) This Part includes special provisions to deal with the potentially damaging effects
of Vancouver's maritime climate, including the possibility of rapid decay in structural
members. [See Appendix A.]
1) Except as provided in Sentence (2), this Part applies, as described in Subsection 1.3.3. of Division A, to
a) building materials, components and assemblies exposed to exterior space or the ground, including those separating interior space from exterior space or separating interior space from the ground,
b) building materials, components and assemblies separating environmentally dissimilar interior spaces (see A-5.9. in Appendix A), and
c)site materials, components, assemblies and grading that may affect environmental loads on building materials, components and assemblies exposed to exterior space or the ground.
(See Appendix A.)2) Buildings or portions of buildings not required to provide environmental separation, not exposed to exterior environmental loads or intended only for summer seasonal use need not conform to this Part where
it can be shown to the satisfaction of the Chief Building Official that the health or safety of building users, the intended use of the building and the operation of building services will not be adversely affected. [See Appendix A.]
1) The Building Envelope Professional shall conduct reviews, and provide letters as required in Sentences (2) and (3), on all buildings or portions of buildings with a cladding system over wood framing or light steel framing and all residential buildings within the scope of Part 5 with respect to Sections 5.4, 5.5. and 5.6. [See Appendix A.]
2) The Building Envelope Professional shall, prior to issuance of a building permit, give notice in writing to the Chief Building Official in the applicable form set out at the end of this Part of a commitment to
a)undertake the required design review and enhanced field reviews,
b)make available all reports to the Chief Building Official, and
c)notify the Chief Building Official if their contract is terminated.
3) The Building Envelope Professional shall, prior to issuance of an occupancy permit, give notice in writing to the Chief Building Official in the applicable form set out at the end of this Part of the completion of the obligations.
1) Words that appear in italics are defined in Article 1.4.1.2. of Division A.
1) Building materials, components and assemblies that separate dissimilar environments or are
exposed to the exterior shall have sufficient
capacity and integrity to resist or accommodate
a)all environmental loads, and effects of those loads, that may reasonably be expected having regard to
i)the intended use of the building, and
ii)the environment to which the materials, components and assemblies are subject, and
b) all structural loads, and effects of those loads, that may reasonably be expected.
2) Compliance with Clause 5.1.4.1.(1)(a) shall be demonstrated by design
complying with Subsection 5.2.1. and construction conforming
to that design.
3) Compliance with Clause 5.1.4.1.(1)(b) shall be demonstrated by design
complying with Subsection 5.2.2., and construction conforming
to that design, with regard to
a)materials, components and assemblies, and associated loads, that are identified in Part 4,
b)air pressure loads imposed on air barrier systems,
c)wind up-lift imposed on roofing, and
d)hydrostatic pressure imposed on the means of protection from moisture in the ground.
4) For materials, components, assemblies and loads to
which Sentence (3) does not apply, compliance with Clause 5.1.4.1.(1)(b) shall be demonstrated
a)by design complying with Subsection 5.2.2. for individual applicable loads and construction conforming to that design, or
b)in the case of common materials, components and assemblies, and their installation, by proven past performance over a period of several years for individual applicable loads.
(See Appendix A.)5) Materials, components and assemblies separating
dissimilar environments and assemblies exposed to the
exterior, including their connections, that are subject to
structural loads, shall
a)transfer such loads to the building structure without adverse effects on the performance of other materials, components or assemblies,
b)not deflect to a degree that adversely affects the performance of other materials, components or assemblies, and
c)be designed, and constructed according to that design, to accommodate
i)the maximum relative structural movement that may reasonably be expected, and
ii)construction tolerances that may be reasonably expected.
(See Article 4.1.3.5., Sentence 4.1.3.3.(2) and Subsection 4.1.8. for information on different types of structural movements.) (See A-5.1.4.1. and A-5.1.4.1.(5)(b) and (c) in Appendix A.)1) Except as provided in Sentence (2), materials used in building components and assemblies that separate dissimilar environments, or in
assemblies exposed to the exterior, shall be
a)compatible with adjoining materials, and
b)resistant to any mechanisms of deterioration that may reasonably be expected, given the nature, function and exposure of the materials.
2) Material compatibility and deterioration resistance
are not required where it can be shown that incompatibility or
uncontrolled deterioration 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.
3) Design and construction of building components and assemblies described in Article 5.1.2.1. shall be in accordance with good practice such as described in CSA S478, "Guideline on Durability in Buildings."
1) Energy utilization, structural and fire safety requirements of other Parts of this By-law shall apply.