With this particular cottage, spray foam insulation was added from the exterior, directly onto the
original log structure. This allowed this previously 2 season Haliburton cottage to transition to a year round retreat.
Because there is no foundation (cottage on blocks), the entire underside of the cottage (approx. 2.5ft
clearance) was sprayed from below, creating a monolithic seal over the entire cottage floor. Similarly,
the cathedral roofline and all walls were sprayed, allowing the beauty of the original wood structure to
remain visible on the inside. The exterior was clad in a Hemlock siding to cover the insulation and
maintain the “wood cabin” feel.
The south facing position of this cottage lends itself to passive solar heating. The picture below of the
thermostat shows the outside temperature at -14C while the inside is approximately 20C. Note that the
cottage owners had just arrived at the cottage and electric baseboard heaters were set at 10C. The
ability of the spray foam to create an insulating “blanket” around the cottage allowed for substantial
Note that the picture of the roofline from the exterior shows virtually no melt (no icicles!) as the
insulation is providing an air barrier between the warm heated area inside the cottage the -14c outside.
Because the cold and warm air are separated by the insulation there is no point for condensation to
occur, as would be the case with fibrous insulation such as fiberglass, roxul or cellulose.
In addition to providing great insulation, when installed in basements spray foam also protects against
radon, a radioactive gas that occurs naturally in the earth’s surface from the breakdown of uranium and
which can leak into homes and pose health risks.