The First Now House

The Retrofit Process: Roof


Insulate the attic and roof

For weight-bearing reasons, it was necessary for us to remove the homeowners existing metal roof when we discovered there were 3 layers of asphalt shingles underneath it. We removed the shingles to reduce the weight on the roof so the solar panels and solar thermal system could be added.

Once the roof was off, and the shingles removed, we used this opportunity to insulate the attic from the outside causing less disruption to the homeowner than doing it from the inside. The roof was also insulated. Thanks to our sponsor, BASF Canada for providing Now House with their WALLTITE ECO™ Insulation/Air Barrier System and its installation. The foam insulation was sprayed into the attic and sloped roof providing a layer of continuous insulation which prevents heat loss and cold bridging.

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.