This roof had two layers of asphalt shingles. All old roofing was removed down to the original deck substrate (1 by 6 deck boards). All rotted or damaged deck boards were replaced and fasteners were added where needed. The roof had four chimneys, one was removed, the remaining three were properly flashed to prevent future leaks. Felt underlayment was installed over entire substrate, followed by Certainteed Landmark Silver Birch architectural shingles.