The SEED Retrofit System

Does your drafty older home need a renovation?

Are your heating bills too high?

Want to replace your old furnace, but need to improve your home’s efficiency first?

Introducing SEED Retrofit Panels, custom fit to your home and fabricated in Ontario by our team at Tooketree Passive Homes.

Developed in partnership with Natural Resources Canada, our exterior retrofit panels are made to wrap around the exterior of your home, significantly improving R-values and airtightness, and in turn, providing comfort and energy savings.

As with all of our SEED Building Systems, our retrofit panels use natural insulation materials that store carbon, helping to mitigate climate change.

Contact us today to tell us about your home and discover how the SEED Retrofit System can help you. 

A: Hemp, mineral wool or other compressible material

B: Layered blocking, wood fibre over plywood

C: TJI framing 9 1/2” deep

D: D-ring lifting mechanism (removed after crane placement)

E: Cavities filled with dense-packed cellulose

F: Mento smart WRB on all six sides

G: 1x4 strapping

H: Joints taped with Tescon Vana

With a variety of options for fitting, fastening, and integrating SEED Retrofit Panels with your existing structure, Tooketree’s retrofit system is adaptable to many existing building types.

  • Fully sealed, factory-assembled panels

  • Depth of 9 ½” at 16” o.c. provides a clear field R value of 28 +

  • Drainage and ventilation are facilitated by pre-installed strapping

  • Incorporates biogenic insulation materials, mainly dense-packed cellulose

  • A high-performance WRB surrounds the entire retrofit panel

  • Site-installed adhesive WRB seals the connections (where necessary)

  • Site-installed compressible layer enables a snug fit with the existing wall (where necessary)

  • The fastening system used will depend on the existing wall structure; likely a combination of Rothoblaas GRK screws and steel brackets.

  • Penetrations for electrical, plumbing and HVAC are pre-installed into the retrofit panels in our factory.

  • If your retrofit includes new windows, you can choose to have your windows pre-installed in the factory.

  • Roof panels are constructed with similar materials. Please inquire about the specifics of your home.

Our retrofit system can increase the insulation value of your Building Envelope (exterior walls and roof) by up to 5 times, and improve your building’s air tightness by 96%.

As a Passive House Builder, we can help you reduce your heating and cooling bill by up to 90%.

Rest assured knowing that you’re doing the right thing for your wallet and the environment, since by reusing your existing concrete foundation and building structure, you’re saving the most carbon-intensive parts of a new build. 

Plus, retrofitting with Tooketree’s biogenic SEED Panels means all those energy savings aren’t driven by extra petrochemicals in your home.

To read about the NRCan research mentioned above, check out the published paper, “Carbon-storing Prefabricated Retrofit Panel Designs," by H. Pope, M. Carver and B. Conley.

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