Cellophane Strips In order to keep the adhesive strips from sticking to other shingles during storage, a strip of cellophane is installed on the underside of the shingles. These cellophane strips align with the adhesive strips while the shingles are in the package.

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A trapezoidal roof profile has a ribbed trapezoidal-shape pattern across the panel. This means, it is a quadrilateral (or a four-sided shape – see Figure 1) that has just a single pair of parallel sides. Sometimes, trapezoidal roofs are mistakenly referred to as corrugated.