A.Paul Fisette, director of Building Materials and Wood Technology at the University of Massachusetts Amherst and a JLC contributing editor, responds: There are two reasons to vent an attic: to remove moisture and to control attic temperature.

If the attic has moisture problems despite functioning soffit and ridge vents, find the bypasses that are allowing moisture-laden air to reach the space and seal them with expanding foam; this is a more effective — and less expensive — solution than adding power venting. If the attic is too hot, consider roof color. Research suggests that it —...

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