Certainteed makes an S7 perfection shingle available in very few areas. Does anyone know if the center nailing technique still applies or if because it is a single row of shingles it does not matter?
Thank you. There are two rows of nailing ovals on the panel. There is one circular nail hole on the second row slightly off center. Would you use the middle oval on the top row and double nail it, or the slightly off center nail on the second row. These are Certainteed S7 Perfection shingles. You are kind to offer the free advice.