When choosing a roofing material, consider its thermal emittance and reflective power to find what is most energy efficient, writes Chris Clarke. Cool-roof materials, which can take into account both considerations, have expanded from a reflective paint to vinyl sheeting, light-colored gravel and other roofing products designed to reflect 90% of the sunlight. If black shingles must be used, Clarke suggests choosing some that reflect at least some light.

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