1) Except as provided for in Sentences (2) or (4), all buildings shall be designed to conform with ANSI/ASHRAE/IESNA 90.1, “Energy Standard for Buildings Except Low-Rise Residential Buildings”.
2) Except as permitted in Sentence (3), those parts of buildings of residential major occupancy in buildings of less than 5 storeys in building height shall be provided with thermal insulation between heated and unheated space, the exterior air or the exterior soil, and heating floor assemblies and heated areas below in conformance to Table 10.2.1.1. A.
3) Alternatives to the requirements of Table 10.2.1.1.A may be determined through
a)the use of energy computer modeling resulting in an equivalent performance to the prescribed requirements in Table 10.2.1.1.A, (See Appendix A), or
b)achieving an EnerGuide Rating System rating of 77, verified by an EnerGuide Rating System energy advisor licensed by Natural Resources Canada to evaluate the energy efficiency of new houses.
4) Buildings or parts of buildings described in Sentence 1.3.3.3. (1), Division A, of other than residential major occupancy, shall be provided with thermal insulation between heated and unheated space, the exterior air or the exterior soil in conformance to Table 10.2.1.1.B.
5) Insulation and the installation of insulation shall conform to
a)Subsection 9.25.2., or
b)Part 5.
| Table 10.2.1.1.A Minimum Thermal Resistance of Insulation RSI, m2°C/W for Buildings of Residential Occupancy less than 5 Storeys in Building Height Forming Part of Sentence 10.2.1.1. (2) | |||
| Building Assembly | Value Required | Value Required | Value Required |
|---|---|---|---|
| Less than 3 500 Degree Days | 3 500 Degree to 4 500 Degree Days | More than 4 500 Degree Days | |
| Attic Space(1) | 7.0 | 7.7 | 9.0 |
| Roof Joist Assemblies (Cathedral Ceilings/Flat Roofs) | 4.9 | 4.9 | 4.9 |
| Frame Walls(2) (including frame crawl space walls) | 3.5 | 3.5 | 3.85 |
| Suspended Floors (framed) | 4.9 | 4.9 | 4.9 |
| Suspended Floors (concrete slab) | 2.1 | 2.1 | 2.1 |
| Foundation Walls (insulation to 600 mm below grade) | 2.1 | 2.1 | 2.1 |
| Unheated Concrete Slabs on Ground at or above grade (insulation around edge of slab(3) and 500 mm vertical or horizontal from bottom edge of slab) | 1.8 | 2.1 | 2.1 |
| Radiant Heating Slabs on Ground (insulation under all slab area and around edge of slab) | 2.1 | 2.1 | 2.1 |
| Radiant Heating Suspended Floor Assembly Over Heated Area (insulation between heated floor and heated area below)(4) | 2.1 | 2.1 | 2.1 |
| Notes to Table 10.2.1.1.A | |
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| (1) | The thermal resistance rating of attic space insulation may be reduced for a distance
of (a) 1.0 m from the exterior wall in buildings where the thermal resistance rating of the wall below is not required to exceed 3.5 or (b) 1.5 m from the exterior wall in buildings where the thermal resistance rating of the wall below is not required to exceed 3.85. |
| (2) | Stud/Frame type wall construction. This is not intended to apply to masonry, log or construction without a cavity. |
| (3) | The top edge of insulation between the slab edge and foundation wall may be protected with a pressure treated preserved wood filler strip not more than 50 mm thick. |
| (4) | Not applicable when heating elements or piping are located within a concrete topping on a suspended floor assembly or within an internally heated suspended slab. |
| Table 10.2.1.1.B Minimum Thermal Resistance of Insulation RSI, m2°C/W for Buildings of other than Residential Occupancy as described in Sentence 1.3.3.3 (1) Division A (Derived from ANSI/ASHRAE/IESNA Standard 90.1) |
||||||
| Building Assembly | Value Required | Value Required | Value Required | |||
|---|---|---|---|---|---|---|
| Less than 4 000 Degree Days | 4 000 to 5 000 Degree Days | Greater than 5 000 Degree Days | ||||
| Heated | Semi heated(1) | Heated | Semi heated(1) | Heated | Semi heated(1) | |
| Roof Insulation | ||||||
| above deck | 2.6ci | 0.9ci | 2.6ci | 0.9ci | 2.6ci | 0.9ci |
| Metal building(2) | 3.3 | 1.8 | 3.3 | 1.8 | 3.3 | 1.8 |
| Attic or other | 5.3 | 3.3 | 6.7 | 3.3 | 6.7 | 3.3 |
| Walls, Above Ground | ||||||
| Mass | 1.3ci | — | 1.7ci | — | 2.0ci | — |
| Metal building(2) | 2.3 | 1.9 | 2.3 | 2.3 | 2.3+2.3(3) | 2.3 |
| Steel Framed(4) | 2.3+0.7ci | 2.3 | 2.3+0.7ci | 2.3 | 2.3+1.3ci | 2.3 |
| Wood Frame or other | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 | 2.3 |
| Suspended Floors | ||||||
| Framed | 5.3 | 2.3 | 5.3 | 2.3 | 5.3 | 3.3 |
| Concrete slab | 1.5 | — | 1.5 | — | 1.5 | 0.7ci |
ci continuous insulation: insulation that is continuous across all structural members without thermal bridges other than fasteners and service openings. It is installed on the interior, exterior or is integral to any opaque surface of the building envelope.
| Notes to Table 10.2.1.1.B | |
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| (1) | Semiheated space is an enclosed space within a building that is heated by a heating system greater or equal to 10W/m2 of floor area but does not exceed: a) 45 W/m2 of floor area in locations of less than 4 000 degree days, or b) 60 W/m2 of floor area in locations of 4 000 or greater degree days |
| (2) | a building constructed primarily of a steel framed superstructure and metal skin |
| (3) | the first rated R-value is the insulation compressed between metal wall panels and
the steel structure the second rated R-value is for insulation installed from the inside, covering the girts |
| (4) | a wall with a cavity (insulated or otherwise) whose exterior surfaces are separated by steel framing members (i.e. typical steel stud walls and curtain wall systems.) |
[Rev. 2, B.C. Reg. 73/2008.]