How does heat from reflected light affect vinyl siding?
Abnormally concentrated sunlight reflected onto vinyl siding by windows can result in surface temperatures far exceeding those caused by direct exposure to the sun. Temperatures necessary to cause significant distortion of vinyl siding are not routinely achieved, even when siding is exposed to both direct sunlight and the reflection from normal, flat window glass. However, under some conditions the glass in energy efficient windows can become concave, forming a mirror that concentrates sunlight in a small area.
