Raised Heel Trusses & R-60 Attic
Also known as energy trusses, these trusses are designed with raised "heels." Heels are the point where the truss sits on the outside wall of the home.
Traditional, commonly used trusses have a very shallow heel height - which is the distance, vertically, from the top of the wall to the undersuface of the roof sheathing - usually only just over 4". It is impossible to adequately insulate and allow for the needed airflow from soffit vents in a 4"-5" heel height. So when you talk with custom home builders, if they don't talk about raised heel trusses for energy efficient homes, you should be concerned.
You can pretty much consider the corners created by ceiling and wall where non-raised heel trusses rest as un-insulated and a major energy loser. In certain situations like a bathroom on the north or west side of a home, these corners can become breeding grounds for mold and mildew.
Not insulating this space is like going outside on a cold winter day without a hat.
A raised heel truss allows enough space for an effective amount of insulation - we design trusses with a minimum heel height of 10". This strikes a good balance between maintaining a reasonable exterior appearance for a home and allowing for increased insulation values.
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