Standard three-tab asphalt shingles are 12” x 36” units, cut to look like three individual shingles when installed. They’re made from asphalt-soaked fibre topped with a layer of mineral granules. Available in a wide variety of colours, styles and grades, they are appropriate for moderate- to steep- sloped roofs. Fibreglass mats have replaced wood fibre felts.
Tips: Look for longer (at least 30-year) warranties on asphalt shingle roofing. Avoid products containing built-in moss inhibitors as many contain zinc, copper and other toxins that harm aquatic life, and may render water unusable for landscape or other rainwater harvest applications. Opt for manufacturers that offer up to 25 per cent recycled content. Select light-coloured mineral top layers; dark asphalt roofs create additional unwanted heat gain during summer months, and shingles subjected to wide temperature swings don’t last as long.
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