Roof Design

Eaves receive special attention to address a common source of heat loss and potential water damage. Roof framing methods often affect energy loss. Many homes use trusses instead of rafters that rest directly on exterior walls. This leaves little space for insulation. Not only does this waste energy dollars, but heat loss melts snow which then refreezes, forming ice dams that can cause extensive moisture damage.

SunTerra homes use a variety of methods to ensure adequate insulation. One method is the "raised heel truss" that raises the roof framing to allow the full layer of insulation to extend over the exterior wall. See illustration at right.
Roof Wall Section

If the home is constructed with roof rafters, we can reduce heat loss through the ceiling by choosing the hot-roof design. It acquires its name because it does not require ventilation for moisture control.

As illustrated in the roof wall section, if we keep moisture from getting into the structure from the outside and prevent moisture laden air from achieving dew point in the structure from the inside, we do not need venting.

This improves the effectiveness of the insulation because air is not wiping away the heat.


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Conventional vs. energy-efficient roof framing
Conventional roof framing pinches insulation near the eaves and allows for excessive heat loss. Energy-efficient roof framing allows enough space over exterior walls for full thickness insulation.