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when planted in groups beside you house, however, a roof need not be totally shaded to achieve excellent results. A study in Alabama showed that air-conditioning costs could be reduced effectively as long as the amount of shade on the roof averaged 20 percent or more for the entire day.
Put Vines on Trellises
To Avoid Damage
Deciduous vines that cling to trellises along walls can afford protection on the south and west sides of a house. However, vines which cling directly to walls may cause some structural deterioration. By providing shade on walls, vines keep the surface temperature down and reduce convection-caused heat gain.
Additional cooling comes from evaporation of moisture from the leaves. Evergreen vines such as English ivy should not be used on walls facing south since they block the winter sun’s warming rays. Vines may help insulate walls on the north and west sides by curbing winter winds.
(Dr. Diane Relf is a horticulture specialist with Virginia Cooperative Extension and is a member of the faculty of Virginia Tech.)
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