Translations:AY Honors/Carpentry/Answer Key/115/en

Shingles are laid on top of the felt roofing, starting with the bottom row. Use roofing nails to attach asphalt shingles directly to the felt roofing. The next row of shingles should be offset from the first so that the boundary between two shingles and the notches that make up the tabs in one shingle are completely covered by the tab of another - not by another boundary or by a notch. The shingles should overlap such that only the tabs show, and not the solid portion on the upper part of the shingle. It helps tremendously to mark parallel lines on the tar paper with a chalk line so that the shingles do not creep uphill. You want the line to be level.