Public Review of Green Code Change Proposals

The following changes are proposed:

Add new Article 10.X.X.X. as follows:

1. Except as permitted in Sentences (2) to (5), all buildings shall be designed to conform with ANSI/ASHRAE/IESNA 90.1 (2004), “Energy Standard for Buildings Except Low-Rise Residential Buildings”.
2. Except as permitted in Sentences (3) and (4), buildings of residential occupancy up to 4 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.X.X.X.
3. Alternatives to the requirements of Table X.X.X. may be determined through the use of energy consumption estimation computer modeling, using other acceptable good engineering principles or achieving an EnerGuide for New Houses rating of 77.

Table X.X.X.X. Minimum Thermal Resistance of Insulation RSI, m2°C/W for Buildings of Residential Occupancy less than 5 Storeys in Building Height

Building Assembly	Value Required	Value Required	Value Required
	Less than 3500 Degree Days	3500 Degree to 4500 Degree Days	More than 4500 Degree Days
Attic Space	7.0	7.7	9.0(1)
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 (full height)	2.1	2.1	4.2(1)
Unheated Concrete Slabs on Ground at or above grade (insulation around edge of slab(3) and 500mm 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

Note to Table 10.X.X.X.
(1) As an alternative to these RSI values the adjacent values in the 3500 degree days to 4500 degree days column may be used, provided any of the provisions listed below with a total point value of at least 2.1 are also employed.

Description	Points
Windows have a maximum heat loss coefficient U-value of 1.6 W/(m2•K), as tested under CSA A440.2-04, “Energy Performance of Windows and Other Fenestration Systems,” or NFRC 100-2004, “Procedure for Determining Fenestration Product U-Factors.”	0.4
Frame Walls (including frame crawl space walls) insulation is at least RSI 4.8	1.5
The mechanical ventilation system includes heat recovery ventilators designed to provide a minimum 55 per cent heat recovery efficiency when tested to the low temperature thermal and ventilation performance test method set out in standard CAN/CSA-C439, “Test for Rating the Performance of Heat/Energy-Recovery Ventilators,” at a Station 1 test temperature of -25°C at an air flow not less than 30 litres per second.	2.3
Ground-source or water-source heat pump (Geoexchange) system for 90% of space heating needs with a coefficient of performance of at least 3.0, compliant with the CAN/CSA-C448 standard, “Design and Installation of Earth Energy Systems.”	5.0
DC, variable speed (ECM) blower motor on the forced air furnace	0.2
Tankless or condensing natural gas or propane water heater with an Energy Factor (EF) of 0.8 or better, as demonstrated by standard CAN/CSA-P.3-04, “Testing Method for Measuring Energy Consumption and Determining Efficiencies of Gas-Fired Storage Water Heaters” or CAN/CSA-P.7-98, “Testing Method for Measuring Energy Loss of Gas-Fired Instantaneous Water Heaters.”	0.8
A drain-water heat recovery system of at least one meter in length	0.1
Solar domestic water heater with a collector surface area of at least 5.92 square meters (63.8 square feet), compliant with the standard CAN/CSA-F383-87, “Installation Code for Solar Domestic Hot Water Systems.”	0.5

(2) Stud/Frame type wall construction. This is not intended to apply to masonry 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.

4. 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.

Add new provision as follows:

5. Non residential buildings falling within the scope of Part 9 shall be provided with thermal insulation between heated and unheated space, the exterior air or the exterior soil in conformance to Table 10.X.X.X.

Table 10.X.X.X. Minimum Thermal Resistance of Insulation RSI, m2°C/W for Buildings of other than Residential Occupancy falling within the scope of Part 9

Building assembly	Value Required		Value Required
	Less than 4500 Degree Days		4500 Degree Days or more
	Heated	Semiheated(1)	Heated	Semiheated(1)
Roof   Insulation above deck   Metal building   Attic or other	2.6 3.3 5.3	0.9 1.8 3.3	2.6 3.3 6.7	0.9 1.8 3.3
Walls, Above Ground   Mass   Metal Building   Steel Framed   Wood Frame or other	1.3 2.1 2.1 2.1	- 1.8 2.1 2.1	2.1 2.1 2.1 2.1	- 2.1 2.1 2.1
Suspended Floors   Framed   Concrete slab	5.3 1.5	2.1 -	5.3 1.5	2.1 0.7

Note to Table 10.X.X.X.

(1)  Semiheated applies to buildings with minimal heating due to the nature of their use. For example, warehouses may only provide enough heat to control dampness or prevent freezing.

Replace Sentence 9.25.2.1.(1) with the following:

9.25.2.1. Required Insulation

1. All walls, ceilings and floors separating heated space from unheated space, the exterior air or the exterior soil shall be provided with sufficient thermal insulation to prevent moisture condensation on their room side during the winter and to ensure comfortable conditions for the occupants. (See A-9.1.1.1.(1) in Appendix A.) (See Part 10)

Delete Sentence 9.25.2.3.(9) and Table 9.25.2.1