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Nailing Wide Cedar Shingles To the Editor: You omitted an important step in your installation instructions for wide shingles (On the House, 4/01). When installing cedar shingles over 8 inches wide, place the shingle face down and score it lengthwise in the middle. Bend it until it cracks, but don’t break it completely in two. Then the shingle should be nailed as shown in your illustration, with the two center nails on either side of the score. All cedar shingles wider than 8 inches will eventually split. By scoring the shingle in advance you can control where the split will occur. When the shingle splits, the two center nails will prevent the two resulting pieces from curling. Without the