1955 Bungalow Deep Energy Retrofit

This homeowner & contractor chose a full retrofit to Net Zero as part of a 3 Case Study project through the SSRIA, accompanied by a Guidebook & Curriculum project in association with SAIT.

No items found.
No items found.
Building photo: "Larsen" wall detail - interior 2x2, ply girts, exterior plumbed 2x2

Calgary, Alberta

The goals of this project were operational Net Zero, electrification & solar PV, and preferred use of sustainable/recyclable insulation material.  The project is nearing completion and has started consumption monitoring as of December 1.

Phase 1 consisted of attic & roof improvements.  Existing insulation, 2 chimneys, 2 bath fan vents, & the main plumbing stack penetrations were removed, all leaks were manually sealed.  Shingles were replaced and the perimeter attic/wall air barrier connection made with sprayfoam prior to blown in cellulose installation.

Phase 2 was removal of natural gas appliances and installation of heat pump & fan coil, ERV, heat pump hot water tank & dryer, electric induction range & fireplace (& garage heat pump).  Gas meter was removed, and electrical service masts moved to garage and upgraded to 200amps available on local transformer.

Phase 3 started with removal of exterior vinyl, poor foam insulation, stucco, siding, and original windows.  8" site built "Larsen" wall installed with 2x2, plywood girts, and exterior plumbed 2x2 prior to installation of new windows & doors.  After mesh & cellulose install, Typar AWB was installed & tape sealed, and walls were strapped for install of vertical corrugated metal siding.

 

Before & After

BEFORE

AFTER

ENERGY 
CONSUMPTION
BEFORE
149
GJ/year
AFTER
0
GJ/year
COMFORT
BEFORE
Cold addition w/ bay window over crawlspace, no home cooling, drafty garage studio space
AFTER
Addition & garage space comfortable, home cooling added
BUILDING CONDITION
BEFORE
Vinyl siding, original windows, garage shingles, furnace to be replaced, mouse/wasp ingress to be remediated.
AFTER
New siding, windows, shingles, heating system replaced - crawlspace pests eliminated.
RENEWABLES
BEFORE
None
AFTER
15.41 kW solar PV to be installed in February
WAll Insulation
BEFORE
2x4 w/ paper batts ~R6, addition 2x6 w/ R20 batt
AFTER
+ 8" R30 dense-packed cellulose +2" R8 mineral fibre on garage
Ceiling Insulation
BEFORE
4" wood chip & fibreglass (R10?)
AFTER
17" loose fill blown cellulose (R60)
Foundation Insulation
BEFORE
No
AFTER
Crawlspace & perimeter insulated, 18” of exposed foundation above grade to be insulated in spring 2023 with 4” XPS (R20)
Windows
BEFORE
2 triple glaze to be retained, 2 double glaze to be retained, remaining original dual panes to be replaced.
AFTER
Original windows replaced with triple glaze, bay window removed & reconfigured.
Ventilation
BEFORE
Furnace + 3 bath fans
AFTER
Panasonic Intelli-Balance 100CFM ERV
Heating
BEFORE
NG furnace, NG fireplace supplement in addition
AFTER
Daikin SkyAir ASHP - house Daikin Aurora 1T, 9000 btu heating ASHP - garage
Cooling
BEFORE
No
AFTER
Daikin SkyAir ASHP - house Daikin Aurora 1T, 8800btu cooling ASHP - garage
Hot Water
BEFORE
Natural Gas Hot Water Tank
AFTER
Rheem Air Source Heat Pump hot water tank
Download Case Study File

Siding will be installed December/January, and solar PV early February - hopefully in conjunction with the release of Calgary's CEIP property tax based loan program.  Air quality, electrical consumption, and solar production will all be monitored ongoing with data provided to SSRIA and SAIT for educational purposes.

Back to Top