The First Now House

The Retrofit Process: Exterior walls


Insulate the exterior walls

The exterior walls are an important part of the home’s envelope. Insulating exterior walls to a higher R-value along with other envelope improvements will increase the effectiveness of energy-efficiency improvements such as heating and cooling equipment and new windows. Without good insulation, these high cost items may not perform as well as expected. A frame was built on the outside walls of the house and a 5 1/2" continuous layer of spray foam insulation was added. This will reduce thermal bridging through wood studs, reduce heat loss, save energy and keep the interior walls warmer in winter, cooler in summer.

Thanks to our sponsor BASF Canada for providing Now House with WALLTITE ECO™ Insulation/Air Barrier System and its installation.

The Retrofit Process

To achieve our goal of a near zero energy retrofit we made the following changes to this home. As all existing houses have a unique set of conditions and characteristics, the application of the Now House process to another house would produce different design specifications. What follows is not a prescription for the near zero retrofit of all homes.