Source: http://www.mah.gov.on.ca/Page16512.aspx
Timestamp: 2018-01-21 12:44:21
Document Index: 701841540

Matched Legal Cases: ['art 9', 'art 9', 'art 6', 'art 9', 'art 5', 'art 5', 'art 5', 'art 6', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11', 'art 11']

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Div. B, 11.3.1.1.
Div. B, 11.5.1.1.
Div. B, 11.6.
The proposed change introduces new requirements for energy efficiency upgrades during renovation of houses and all other buildings.
Section 11.3. Proposed Construction
11.3.1.1. Material Alteration or Repair of a Building System
(1) Where an existing building system is materially altered or repaired, the performance level of the building after the material alteration or repair shall be at least equal to the performance level of the building prior to the material alteration or repair. (See Appendix A.)
A-11.3.1.1.(1) Performance Level.
States the philosophy and intent of this Article: “after construction, the performance level of the building may remain the same, or be made better, but may not be made worse”.
Section 11.5. Compliance Alternatives
11.5.1. Compliance Alternatives (See Appendix A.)
Selected Lines from
Tables 11.5.1.1.(A) through 11.5.1.1.(F)
In houses, rooms or spaces in dwelling units to be ventilated by natural means in accordance with Subsection 9.32.2. or by providing adequate mechanical ventilation.
(b) Existing acceptable for Article 2.1.1.9. of MMAH Supplementary Standard SB-12, “Energy Efficiency for Housing”.
(c) Existing previously occupied log houses that are dismantled and reconstructed are exempt from Article 2.1.1.5. of MMAH Supplementary Standard SB-12, “Energy Efficiency for Housing”.
Revise Articles 11.3.1.1. and .11.5.1.1., and add a new Section 11.6 for new requirements.
Note: The provisions of Supplementary Standard SB-10 currently in effect will be relocated to SB-10A.
Note: The provisions of Supplementary Standard SB-12 currently in effect will be relocated to SB-12A.
(1) Except as provided in Sentence (2), where an existing building system is materially altered or repaired, the performance level of the building after the material alteration or repair shall be at least equal to the performance level of the building prior to the material alteration or repair. (See Appendix A)
(2) Except as provided in Sentence (3), where an existing building system is materially altered or repaired, material alteration or repair of the building system shall comply with Section 11.6. (See Appendix A-11.6.1.1.(1)).
(3) Where, as a result of a material alteration or extension of an existing building, walls or ceilings separating exterior or unconditioned space from a conditioned space that become interior walls or ceilings within conditioned space on both sides, the wall or ceiling need not comply with Section 11.6.
(4) Where as a result of a material alteration or repair, any unconditioned space that becomes a conditioned space, the envelope of the space shall comply with all other Parts of the Code.
With respect to energy efficiency, material alterations and repairs are intended to include such things as removal of most of the drywall on an exterior wall exposing most of the stud cavities, removal of substantial portions of exterior cladding such that large areas are re-cladded, converting a roof from a vented open attic to conditioned space and a compact roof system, or replacing equipment or building components such as an HVAC unit.
Except as provided in Section 11.6, required outdoor air rates may be provided by mechanical, natural or combination of natural and mechanical means.
Except as provided in Section 11.6, existing acceptable.
Except as provided in Section 11.6, in houses, rooms or spaces in dwelling units to be ventilated by natural means in accordance with Subsection 9.32.2. or by providing adequate mechanical ventilation.
Section 11.6. Energy Efficiency of Buildings (See Appendix A.)
11.6.1. General
11.6.1.1. General
(1) Except as provided in Sentences (2) to (5), where an existing building system is materially altered or repaired, or a part of an existing building system is replaced, its energy efficiency shall conform to this Section. (See Appendix A)
(2) Existing buildings need not conform to the requirements of this Section where it can be demonstrated to the chief building official that the requirements are impracticable because,
(a) of structural or construction difficulties; or
(b) it is detrimental to the preservation of a heritage building (See Appendix A).
(3) Building elements that are subject to material alteration or repair but are not addressed by this Section shall comply with the other requirements of this Part.
(4) For the purpose of this Subsection, an entire wall assembly, entire roof assembly, entire ceiling assembly, entire floor assembly, or entire window assembly is individually considered a building system.
(5) Where a building includes two or more occupancies, each occupancy shall be separately considered and shall comply with the applicable provisions of the Code.
11.6.1.2. Matching Components within a System
(1) A component replaced within a building system must be compatible with the building system and possess the necessary characteristics to perform its intended function within the building system.
(2) The entire building system need not be replaced where only a component is replaced within the building system.
11.6.2. Energy Efficiency Measures for Part 9 Residential Buildings
11.6.2.1. General
(1) Where an existing building of residential occupancy that is within the scope of Part 9 is altered, renovated or repaired, or a part of an existing building system is replaced its energy efficiency shall conform to this Subsection.
(2) Where insulation, vapour barrier, or air barrier system of a building envelope is altered in order to meet the requirements of this Subsection, the design and construction of those parts that are affected must comply with:
(a) Except for the insulation values required by Article 9.25.2.1., the requirements of Section 9.25.,
(b) Subsection 9.19.1.
(c) Article 9.13.2.6., and
(d) Except as provided in Sentences (3) and (4), Article 9.14.2.1.
(3) An interior drainage system may be provided in lieu of the exterior drainage layer required in Sentence 9.14.2.1.(2).
(4) Where it can be shown that bulk water leaks or signs of bulk water leakage are not present, the drainage layer required in Sentence 9.14.2.1.(2) need not be provided.
(5) Where the material alteration or repair involves the installation of insulation, a vapour barrier , an air barrier or where the material alteration or repair allows for complete access to the components of the assembly that contains air barrier materials, the air barrier shall be inspected in each assembly to determine whether a continuous air barrier as required by Subsection 9.25.3. is present for that assembly. (See Appendix A)
(6) Where a continuous air barrier referred to in Sentence (5) is not present, materials and sealants shall be added to create a continuous air barrier within the areas of the building subject to the material alteration or repair (See Appendix A).
(7) Where the material alteration or repair involves the installation of insulation, a vapour barrier, an air barrier or where the material alteration or repair allows for complete access to components of the assembly that contains a vapour barrier, the vapour barrier shall be inspected in each assembly to determine whether a vapour barrier required by Subsection 9.25.4. is present for that assembly.
(8) Where a vapour barrier referred to in Sentence (7) is not present, materials and sealants shall be added to create a vapour barrier within the areas of the building subject to the material alteration or repair.
(9) Insulation need not be added to existing roof, wall or floor framing spaces, where framing spaces are
(a) not exposed during construction, or
(b) completely filled with insulation.
(10) Insulation required by Articles 11.6.2.2.to 11.6.2.5,
(a) shall have a thermal resistance not less than RSI 0.022 per mm and
(b) need not exceed the insulation levels required in Supplementary Standard SB-12A.
(11) Where the insulation of walls or a ceiling is materially altered or repaired, framing spaces that can be accessed and insulated without removal of the interior finish, such as vented attics, shall be substantially air sealed and insulated in accordance with this Subsection.
(12) Despite Sentence 11.3.2.1.(1), where an existing wall system is extended, the thickness of the extended portion of the wall is permitted to match the thickness of the existing wall and the required insulation need not be provided, as long as the extended wall is filled completely with insulation.
11.6.2.2. Foundation Walls
(1) Except as provided in Sentence (2), where a foundation wall is materially altered or repaired and the framing or part of the framing is exposed from floor to ceiling, insulation shall be installed to completely fill the full height of the framing space formed by interior framing of the exposed parts of the foundation wall.
(2) Where a foundation wall without framing space is materially altered or repaired to finish the wall but framing is not installed as part of the alternation or repair, the foundation wall shall be insulated with continuous insulation that has a thermal resistance not less than RSI 2.11.
(3) Where a foundation wall without framing spaces is materially altered or repaired to finish the wall but framing is not installed as part of the alteration or repair, the air barrier and vapour barrier shall comply with Sentences 11.6.2.1. (2), (5), (6), (7) and (8).
(4) Where a foundation wall is materially altered, or repaired to finish, the drainage layer of the wall shall comply with Sentences 11.6.2.1. (2) to (4).
(5) Insulated and substantially below-grade foundation walls are permitted to be designed to allow inward drying.
(6) Where foam plastic insulation provides a vapour barrier, it shall be installed in direct contact with the foundation, be continuous, and the interior face of the foam plastic insulation shall be sufficiently close to the warm side of the assembly to prevent condensation at winter design conditions.
(7) Where the same product is used to control the transfer of heat, air and vapour, it shall be continuous and the interior face shall be sealed as an air barrier.
11.6.2.3. Walls, Other Than Foundation Walls
(1) Except as provided in Clause 11.6.2.1.(9)(b), where a wall that separates exterior or unconditioned space from conditioned space is materially altered or repaired and the framing or part of the framing is exposed from floor to ceiling, the framing spaces shall be filled completely with insulation.
(2) Where a wall that separates exterior or unconditioned space from conditioned space is materially altered or repaired and the framing or part of the framing is exposed from floor to ceiling, the air barrier and vapour barrier shall comply with Sentences 11.6.2.1. (2), (5), (6), (7) and (8).
(3) Except as provided in Sentence (5), where a load bearing masonry or stone wall provides the interior and exterior finish, and the interior or exterior will be clad or refinished, an air barrier and vapour barrier shall comply with Sentences 11.6.2.1. (2), (5), (6), (7) and (8), and a continuous insulation with a minimum RSI of 1.76 shall be installed.
(4) Except as provided in Sentence (5), where an exterior alteration including re-cladding or over-cladding is included in the material alteration or repair, an air barrier, a vapour barrier in accordance with Sentences 11.6.2.1. (2), (5), (6), (7) and (8), and a continuous insulation layer with a minimum RSI of 1.3 shall be installed.
(5) Sentences (3) and (4) do not apply where it can be demonstrated to the chief building official that the requirements are impracticable because,
(a) it would reduce a floor area below the minimum floor areas specified in Section 9.5., or
(b) the building would no longer comply with the requirements of a by-law under Section 34 or 38 of the Planning Act or other similar requirements.
11.6.2.4. Ceilings below Unheated Attics or Roof Spaces
(1) Where as part of the material alteration or repair, interior finish of a ceiling below an unheated attic is removed, or insulation is added, the total ceiling insulation shall be not less than RSI 8.80.
(2) Where a vented and accessible attic is the roof type on a building undergoing renovation, and the walls of the building are being substantially insulated, and insulation shall be added to achieve a minimum of RSI 7.0.
(3) Where Sentence (1) or Sentence (2) is applicable, the attic shall also be substantially air sealed on the warm side so that the air barrier and the vapour barrier of the ceiling assembly shall conform to Sentences 11.6.2.1. (2), (5), (6), (7) and (8).
(4) Where the insulation height in Sentence (1) or Sentence (2) exceeds the height of the ventilation baffles in the attic, or where baffles are not present, baffles shall be extended or installed to ensure attic ventilation is in accordance with Subsection 9.19.1.
11.6.2.5. Roofs without Attic Spaces and Exposed Floor Framing Spaces
(1) Except as provided in Sentence (3) and Clause 11.6.2.1. (10)(b), where framing spaces in roofs without attic space are exposed due to renovation, the roof framing spaces shall be filled with insulation.
(2) Except as provided in Clause 11.6.2.1. (10)(b), where framing spaces in an exterior floor are exposed due to renovation, the floor framing spaces shall be filled completely with insulation.
(3) The roof assemblies referred in Sentence (1) shall be ventilated in accordance with Subsection 9.19.1.
(4) Where Sentence (1) or Sentence (2) is applicable, the air barrier and the vapour barrier of the roof or floor assembly shall conform to Sentences 11.6.2.1. (2), (5), (6), (7) and (8).
11.6.2.6. Windows, Doors and Skylights
(1) Except as provided in Sentences (2) and (3), replacement windows and sliding glass doors shall have a maximum U-value of 1.8 W/m2.ºK.
(2) Storm windows need not comply with the requirements of this Section.
(3) Replacement glass in an existing sash and frame need not comply with the requirements of this Section.
(4) Where a window, door or skylight is replaced, the air barrier of the window or door system shall be air sealed to the air barrier material of the wall system.
(5) Where a window, door or skylight is replaced, exterior drained sub-sill flashing systems shall be installed to drain to the exterior or the installation of the window, door or skylight shall conform to Subsection 9.7.6.
(6) Re-use of an existing door is permitted.
11.6.2.7. Ventilation, Air leakage and Depressurization
(1) Except as provided in Sentences (2) and (3), where the material alteration or repair substantially increases the air tightness of the building, the rates at which outdoor air is supplied shall be in conformance with applicable requirements of Part 6 or Section 9.32 (See Appendix A).
(2) Except as provided in Sentence (3), ventilation required by Sentence (1) may be provided by mechanical means, natural means or a combination of mechanical and natural means.
(3) Where the material alteration or repair substantially increases the air tightness of the building and the building is classified as a Type III house in accordance with Article 9.32.3.1., the building shall be provided with
(a) a heat or energy recovery ventilator that is installed in accordance with Subsection 9.32.3., or
(b) a balanced ventilation system that meets the requirements of CAN/CSA-F326M “Residential Mechanical Ventilation Systems”.
(4) Where the material alteration or repair substantially increases the air tightness of the building, provision shall be made for the admission of a supply of make-up air in sufficient quantity so that the operation of the exhaust systems or combustion equipment is not adversely affected.
11.6.2.8. Mechanical Systems
(1) Replacement natural gas- or propane-fired furnaces shall have a minimum AFUE of 92%.
(2) Replacement natural gas- or propane-fired domestic water heaters shall have a minimum energy factor of 0.67.
(3) Replacement natural gas- or propane-fired boilers shall have a minimum AFUE of 88%.
(4) Where a natural draft combustion unit is replaced in a building where the building envelope is substantially air sealed as a part of any renovation, natural draft combustion unit shall be replaced with
(a) a direct vented or a mechanically vented induced draft unit or
(b) an air supply for the combustion appliance shall be installed in accordance with the applicable fuel code.
(5) Except as provided in Sentence (6) where a fuel-fired equipment is replaced in a building, the building shall be equipped with carbon monoxide alarms in accordance with the requirements of Subsection 9.33.4. or Subsection 6.2.12, except that plugged into or battery operated alarms are permitted.
(6) Any penetrations of the building air barrier system for the installation of new mechanical systems, or created as a result of the removal of existing systems shall be air sealed to the layer identified as the air barrier and insulated.
(7) Where space heating or space cooling equipment is replaced, space heating and cooling loads shall be
(a) calculated in accordance with Article 6.2.1.1 and
(b) be based on
(i) information from the existing building,
(ii) the new building systems being installed, and
(iii) the new air tightness of the whole building
11.6.3. Energy Efficiency Measures for All Buildings Other Than Part 9 Residential
11.6.3.1. General
(1) Except as provided in Sentence 11.6.2.1.(1), where an existing building is materially altered or repaired, or a part of an existing building system is replaced, its energy efficiency shall conform to this Subsection.
(2) Where the building envelope is altered in order to meet the requirements of this Section, the design and construction of those parts that are affected shall comply with the requirements of Part 5.
11.6.3.2. Air barriers and Vapour barriers (See Appendix A)
(1) Where the material alteration or repair involves the installation of insulation, a vapour barrier, an air barrier system or where the material alteration or repair allows for complete access to the components of the assembly that contains air barrier materials, the air barrier shall be inspected in each assembly to determine whether a continuous air barrier as required by Part 5 is present for that assembly. (See Appendix A)
(2) Where a continuous air barrier referred to in Sentence (1) is not present, materials and sealants shall be added to create a continuous air barrier within the areas of the building subject to the material alteration or repair (See Appendix A).
(3) Where the material alteration or repair involves the installation of insulation, a vapour barrier, an air barrier or where the material alteration or repair allows for complete access to components of the assembly that contains a vapour barrier, the vapour barrier shall be inspected in each assembly to determine whether a vapour barrier required by Part 5 is present for that assembly.
(4) Where a vapour barrier referred to in Sentence (3) is not present, materials and sealants shall be added to create a vapour barrier within the areas of the building subject to the material alteration or repair.
11.6.3.3. Roofs
(1) Except as provided in Sentences (4) and (5), where roof insulation needs to be disturbed to replace the roof membrane, the thermal performance of the roof shall conform to Table 11.6.3.3.
Table 11.6.3.3.
Roof Thermal Performance Requirements (1)
Forming Part of Sentences 11.6.3.3.(1)
Assembly(2) Maximum U-Value (W/m2K)
Min. R-Value (m2K/W)
RSI-4.4 ci
Roof with an Attic Space
RSI- 6.7
Notes to Table 11.6.3.3.:
(1) Assemblies shall meet either the maximum U value or minimum R value, not both
(2) U values and “ci” have the same meaning as in Supplementary Standard SB-10A
(2) Where insulation is added to a roof with an attic space, except as provided in Sentences (5) and (6), the thermal performance of the roof shall conform to Table 11.6.3.3.
(3) Where a roof membrane is replaced or altered, or insulation is added, the air barrier and the vapour barrier of the roof assembly shall conform to Article 11.6.3.2.
(4) Where the thickness of insulation needed to meet the requirements in Table 11.6.3.3 results in practical problems relating to drainage or membrane connections at parapets and curbs, the insulation requirements may be reduced to a minimum thermal resistance of RSI 2.6.
(5) Where the weight of the insulation needed to meet the requirements in Table 11.6.3.3 exceeds the load capacity of the roof structure, the insulation levels shall be reduced to match the safe capacity of the roof structure.
(6) Where there is not enough space in an attic for the insulation required in table 11.6.3.3, insulation levels are permitted to be reduced.
11.6.3.4. Walls and Fenestrations
(1) Where the entire or part of the framing of a wall that separate exterior or unconditioned space from conditioned space is exposed from floor to ceiling, the overall thermal performance of the exposed portions shall conform to the requirements of Table 11.6.3.4 (See Appendix A)
Table 11.6.3.4.
Above Grade Wall Thermal Performance Requirements (1)
Forming Part of Sentences 11.6.3.4.(1)
Assembly (2) Maximum U-Value (W/m2K)
U-0.404
RSI-2.6 ci
U-0.365
RSI-2.3 + 1.3 ci
RSI-2.3 + 0.7 ci
C-0.678(2)
RSI 1.3ci
C-0.678
Notes to Table 11.6.3.4.:
(2) Where the entire or part of the framing of a wall that separate exterior or unconditioned space from conditioned space is exposed, the air barrier system and the vapour barrier of the wall assembly shall conform to Article 11.6.3.2.
(3) Where a masonry or concrete wall that separates exterior or unconditioned space from a conditioned space, is subject to be re-cladding or re-finishing the wall assembly shall contain
(a) an air barrier and vapour barrier conforming to 11.6.3.2, and
(b) insulation conforming to Table 11.6.3.4.
(4) Where an exterior wall retrofit including re-cladding or over-cladding is included in the renovation, the wall assembly shall contain
(5) Notwithstanding the window to wall ratio limitation set in SB-10A, where a fenestration unit is replaced, the replacement unit shall meet the values required in the applicable building envelope Table of the Supplementary Standard SB-10A.
(6) Where only the insulated glazing units of a fenestration system are replaced,
(a) the insulated glazing unit shall have a U-value less than 2.0 W/m2 ºK, and
(b) where practical a thermal break shall be included in the window framing system.
11.6.3.5. Lighting
(1) Where an entire or part of a lighting system, or a lighting component is altered, the new parts of the lighting system shall meet all the applicable requirements of Supplementary Standard SB-10A.
(2) Where an entire or part of a lighting system in a suite is altered due to change of use or a new tenant or owner, the entire lighting system of the suite shall meet the requirements of Supplementary Standard SB-10A.
(3) Where a lighting system of a suite is being altered, occupancy sensors shall be installed in enclosed offices, washrooms and meeting rooms in accordance with Supplementary Standard SB-10A.
11.6.3.6. Ventilation, Air leakage and Depressurization
(1) Except as provided in Sentences (2) and (3), where the material alteration or repair substantially increases the air tightness of the building, the rates at which outdoor air is supplied shall be in conformance with applicable requirements of Part 6. (See Appendix A)
(2) The ventilation required by Sentence (1) may be provided mechanical means, natural means, or a combination of mechanical and natural means.
(3) Where the material alteration or repair substantially increases the air tightness of the building, provision shall be made for the admission of a supply of make-up air in sufficient quantity so that the operation of the exhaust systems or combustion equipment is not adversely affected.
11.6.3.7. HVAC Equipment and Systems
(1) Except as provided in Sentence (2) to (5), where existing heating ventilation and air- conditioning equipment is replaced, the replacement equipment shall conform to the efficiency and testing requirements of Supplementary Standard SB-10A unless it can be shown that the existing distribution infrastructure related to the equipment may degrade the performance, efficiency or durability of the new equipment.
(2) Where existing heating ventilation and air-conditioning equipment is replaced, and the efficiency requirements of Supplementary Standard SB-10A cannot be met, the replaced equipment shall meet applicable requirements of Sentences (3) to (5).
(3) The replacement chiller shall have variable speed.
(4) The replacement boiler shall
(a) be modulating type, and
(b) have thermal efficiency of not less than 88% when it is rated in accordance with applicable test standard listed in Supplementary Standard SB-10A.
(5) Outdoor air ventilation equipment shall have capabilities to adjust amount of air supplied to the building.
(6) Where a control system of a heating ventilation and air-conditioning system is materially altered or replaced, control system shall meet with requirements of Supplementary Standard SB-10A.
11.6.3.8. HVAC Piping and Ductwork Insulation
(1) Except as provided in Sentence (3) where the heating ventilation system is partially or fully altered or repaired, ductwork and piping that is not covered with insulation shall be sealed and conform to insulation requirements of Supplementary Standard SB-10A.
(2) Except as provided in Sentence (3) where the ductwork, piping or covering insulation is altered or repaired, insulation shall conform to Supplementary Standard SB-10A.
(3) Insulation required in Sentences (1) and (2), may be reduced, if there is not enough space to install required insulation around the ductwork or piping.
11.6.3.9. Service Water Heating Equipment and Piping Insulation
(1) Where a service water heater is replaced, the replacement service water heater shall conform to the requirements of Supplementary Standard SB-10A.
(2) Where the service water heating system is partially or fully materially altered or repaired, insulation of the effected conform to the requirements of Article 11.6.3.7.
11.6.4. Performance Compliance
11.6.4.1. Performance Compliance
(1) For the purpose of this Subsection, reference design shall be the design of a building system or systems that is the same as the design of a corresponding proposed building system or systems, except that the reference design meets the requirements of this Section whereas proposed may vary.
(2) A proposed design is deemed to comply with the requirements of this Section where it can be shown that the simulated annual energy use of the proposed design is not greater than the simulated annual energy use of a reference design.
(3) The simulated annual energy use of the proposed design and the reference design required in Sentence (2) shall be calculated in accordance with Sentences (4) to (7).
(4) The simulated annual energy use shall be calculated using,
(a) a recognized annual energy use simulation software,
(b) the local climatic data,
(c) the building envelope component properties and characteristics,
(d) the building orientation,
(e) the energy types,
(f) the equipment efficiency,
(g) the equivalent appliance and other plug-in loads,
(h) a measured or representative air leakage rate for the building.
(5) The building envelope component properties and characteristics referred in sentence (4) shall be determined by a qualified person through visual inspection or intrusive investigation.
(6) Where a parameter required for the simulation is not known or cannot be determined in an existing building, those parameters shall be assumed to be equal for the proposed design and the reference design.
(7) Unless otherwise mentioned in this Subsection the annual energy use simulation rules referenced in Supplementary Standard SB-10A shall apply.
A-11.6. Energy Efficiency of Buildings.
Energy efficiency of existing buildings subject to a material alteration or repair must conform to the requirements of Part 11. Material alterations and repairs must not create unsafe, unhealthy or hazardous conditions or overload existing building systems.
This Section is not intended to be used to require the upgrading of the energy efficiency of an existing building or building system lawfully in existence where no material alteration or repair is contemplated. Unaltered portions of existing buildings need not comply with these requirements, unless otherwise indicated or changes made to renovated portions adversely affect the systems in unaltered portions of the building.
A framing space is considered to be exposed when the interior finish is removed for the floor-to-ceiling height as part of a renovation or alteration.
New heat loss design calculations would be necessary for all space heating equipment replacements.
A-11.6.1.1. (1) General.
Where only a component, assembly, equipment or part of a building system related to energy efficiency is replaced, it is generally a change made as part of a material alteration or repair. However, if the entire building system is replaced, then it would be considered a new system to which Article 11.3.1.2. applies. For example replacing an HVAC unit would be an alteration but replacement of an HVAC unit and all related ductwork would be an installation of a new system.
A-11.6.1.1.(2)(b) General.
A-11.6.2.1.(5) and (6) General.
Penetrations and intersections listed in (a) to (h), if present, must be reviewed and air sealed to the layer as considered the air barrier.
(a) floor to wall intersection
(b) wall to rim joist intersection
(c) rim joist to above grade air barrier
(d) electrical boxes
(e) electrical penetration(s) at the rim joist
(f) mechanical penetration(s) at the rim joist
(g) wall air barrier to window air barrier
(h) wall air barrier to exterior door air barrier
A-11.6.2.7. Ventilation, Air leakage and Depressurization.
Air tightness of the building is considered to be substantially increased when the renovation work focuses on the air tightness of the building and the air barrier is improved over a significant proportion of the envelope area.
A-11.6.3.2. Air barriers and Vapour barriers.
Penetrations and intersections listed in (a) to (k), if present, must be reviewed and air sealed to the layer identified as the air barrier.
(a) attic hatch, access panel, or pull down stair opening from conditioned space
(b) balloon-framed gable wall
(c) gable truss
(d) common wall
(e) dropped soffits (bulkheads, arches, cabinet bonnets)
(f) exterior top plate at soffit
(g) kneewalls
(h) two story wall
(i) bath fan
(j) chimney chase – masonry
(k) chimney chase – metal pipe
A-11.6.3.4.(1) Walls and Fenestrations.
Existing insulation is permitted to account for part of the insulation required in Table 11.6.3.4.
A-11.6.3.6. Ventilation, Air leakage and Depressurization.
The Building Code has included energy efficiency requirements for new houses since its inception in 1975, and for commercial buildings since 1993. Over several Code cycles and interim amendments, the energy efficiency requirements of the Building Code have steadily advanced for the construction of new buildings. However, until now energy efficiency upgrade requirements have been largely omitted during renovations of existing buildings.
Currently, the Building Code specifies that in certain cases renovation projects do not need to meet the requirements that would apply to new construction if they meet compliance alternatives set out in Part 11 of Division B of the Code. The philosophy behind Part 11 is that where renovation work is undertaken, such as an alteration or repair, the Building Code generally intends to maintain at least the same performance level of the building that existed before the renovation took place. Building owners could, however, voluntarily improve the energy efficiency performance of the building during renovation. However, Part 11 compliance alternatives currently allow renovation projects to maintain the same level of performance with respect to energy efficiency (e.g., insulation, vapour barriers and mechanical equipment) Part 11 has been silent respecting requirements to increase energy efficiency, and therefore does not support government objectives to reduce energy consumption and greenhouse gas emissions.
Existing buildings represent approximately 98-99% of Ontario’s building stock. The potential for improvements in energy conservation in existing buildings is therefore significant. To explore this potential, the Ministry of Municipal Affairs has developed proposed Building Code requirements for energy efficiency upgrades at the time of renovation as a first step to improve energy efficiency of existing buildings.
The proposed requirements will establish that energy efficiency improvements are now an intended outcome of renovation work undertaken under the Building Code. It is proposed that certain Part 11 compliance alternatives be eliminated, while other compliance requirements would be subject to a new Section 11.6. of Division B. The proposed new code provisions affect building elements such as insulation, ventilation system, space and water heating systems, lighting systems, windows and doors, air barriers and vapour barriers. The particular challenges of existing buildings are recognized, and special provision is made for heritage buildings, or situations where particular renovations may not be practicable, or cause structural or construction difficulties.
Property owners and renovators can always exceed these requirements; the proposed requirements follow the traditional code approach and only apply to the proposed work and generally not other parts of the building that are not proposed to be renovated under the scope of the building permit.
There will likely be additional costs associated with the proposed requirements, if building owners did not plan to optimize the benefits of the renovation they intend to carry out. The degree of incremental cost incurred is contingent on the scope of the overall project and characteristics of the individual building concerned. However, building owners will be well positioned to benefit from reductions in energy consumption and potential savings to their utility bills.
As the proposal reflects a shift in the philosophy of Part 11 the Ministry intends to allow for a sufficient transition period for building officials to become familiar with the new requirements.
Main Objectives: Energy and GHG Emission Reductions
Other Benefits: Drainage layer
[F60-OH1.1, OH1.2, OH1.3]
[F60-OP2.1, OP2.2, OP2.3]
[F60-OS2.1, OS2.2, OS2.3]
Other Benefits: Air Barrier
[F55-OH1.1, OH1.2, OH1.3]
[F63-OH1.1, OH1.2]
[F63-OS2.3]
Other Benefits: Vapour Barrier
Other Benefits: Ventilation
[F40, F50, F52-OH1.1]
[F51, F52-OH1.2]
Other Benefits: Insulation
[F51, F63-OH1.1, OH1.2]
Other Benefits: Depressurization
[F44, F81-OH1.1]
[F44, F81-OS3.4]
Other Benefits: Water movement
[F61-OH1.1, OH1.2]