"Everyone studies how green roofs operate in warm conditions," says Brad Bass of the U of T Centre for Environment. "No one else has looked at winter design." Bass analyzed a test roof built in Ottawa by Karen Liu of the National Research Council's Institute for Research in Construction, to offer the first conclusive data that winter green roofs can help reduce heat loss and energy consumption during cold months..."
"The winter green roof uses evergreens — juniper shrubs — and a thicker soil base than typical leafy green roofs, which generally provide passive benefits to the environment by reducing the need for air conditioning on hot days. The winter roof was installed on both a standard test house and an energy-efficient winterized house. Bass used environmental systems performance software to chart the indoor temperature fluctuations in both buildings".
"The results for the winterized house were good, and the results for the regular house were dramatic," says Bass. "The assessment opens up designers to considering winter roofs as part of a year-round energy efficiency strategy."...
Tip of the stocking hat to Professor Brad and his team, eh!