Prescriptive Path

All 10 of the building and technology upgrades listed below must be incorporated into your new home to be eligible for a $1,200 rebate under the Prescriptive Path.

Prescriptive Path technical standard and associated trade off options

Increased attic insulation: R-58 effective

  • Any building code-compliant approach to achieving R-58 effective attic insulation is eligible.
  • Not eligible for trade off.

Increased exterior above grade wall insulation: R-17 effective

  • Any building code-compliant approach to achieving an R-17 effective wall assembly is eligible, including 2x4 and 2x6 wall assemblies. For example:
    • R-22 batt insulation (2x6, R-22 nom, 24"o.c.);
    • spray foam insulation (incl. flash and fill);
    • exterior rigid foam insulation;
    • double wall construction;
    • ICF walls;
    • SIPs.
  • Not eligible for trade off.

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Increased basement and floor header insulation: R-18 effective

  • Increased floor header (rim joist) insulation: R-18 effective
    • Commonly achieved through the application of spray foam in the headers, or exterior insulation;
    • Not eligible for trade off.
  • Increased basement insulation: R-18 effective
    • Any building code-compliant approach to achieving an R-18 effective basement wall assembly is eligible. Slab on grade systems will be reviewed for insulation detailing. For example, for basement walls:
      • batt insulation (traditional wall);
      • spray foam insulation (traditional wall);
      • exterior rigid foam insulation (may be combined with interior insulation);
      • ICF walls;
      • SIPs.
    • Not eligible for trade off.

Basement slab edge thermal break: R-5 effective

The intent is to minimize thermal bridging, which can also be achieved with ICFs, SIPs, or the insulated wall assembly to which a suspended floor abuts.

  • A thermal break of at least R-5 effective located at the slab edge.
    • Slab on grade systems will be reviewed for insulation detailing.
  • Not eligible for trade off.

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Tested air tightness of less than 1.5 air changes per hour

At completion, a program evaluator will test air tightness with blower door equipment. If the home does not initially meet the 1.5 ACH requirement, the evaluator will identify any potential problem areas and perform a second test at your request. Only one repeat test will be funded by the program. Should the second test fail, you must pay for any other tests.

Windows must be triple glazed, low-e, argon, with low conductivity frame and spacer

Window inserts in a door are not included in the window requirement. Email us about specific window eligibility.

  • Patio doors are big windows so we do require those windows to meet the standard.
  • Egress windows under 9 ft2 are acceptable as dual pane low-e argon.

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High efficient heat recovery ventilation (HRV) with SRE 65% or better at both 0°C and −25°C

  • Manufacturer’s literature should state an efficiency of SRE 65 at 0°C and −25°C.
  • Not eligible for trade off.

HRV advanced controls

  • HRV advanced controls should have the ability to operate the HRV in standby mode (no low speed fan) or intermittent operation (20 minutes per hour) and still run if required by the de-humidistat or the bathroom controls.
  • HRV controls integrated into smart thermostats are eligible.
  • Not eligible for trade off (this may change as new controls/systems arrive).

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LED lighting throughout

  • Includes all common use areas include kitchen, living room, entryway, main hall, bathrooms, and exterior locations.
  • LED lighting replacing the equivalent of 25 non-LED sockets is also acceptable.
  • Not eligible for trade off.

Reduced thermal bridging

A minimum 4 of the following must be identified and incorporated into the new home:

  • insulation is in full contact with air barrier;
  • wind wash of insulation is prevented;
  • foam gun or 2-part foam used;
  • corners use two studs only;
  • framing at 24" o.c.;
  • the house is “solar ready”;
  • solar orientation was incorporated into the design;
  • exterior insulating sheathing or other continuous unbroken layer of insulation was used;
  • identify material used for pre-formed or site-built pan flashing (sloped sill, back dam, or both);
  • identify type of tape used on the building wrap;
  • amount of waste that left jobsite (in tonnes);
  • amount of insulation added to headers;
  • air barrier materials used (list a minimum of 4);
  • identify all measures undertaken to avoid thermal bridging.

This information will be collected the Prescriptive Path Completion Declaration (PDF, 164 KB) and will be submitted for review at project completion.

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R-value calculators

Insulation levels are stated in effective, not nominal, terms. For effective R-value calculators, visit: