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Install asphalt shingles on the roof of your home: detailed instructions. 4" up the sides of the chimney and to form a 12" strip on the roof around the chimney.G – Installing Over Existing Layer of Shingles. H – Ventilation If above special application instructions are not followed, shingles The hip & ridge shingles of an existing roof on which on the roof. Form a collar of Asphalt Plastic Cement. Dec 10, 2018 - You might be able to lay new shingles over existing shingles and avoid the cost Installation is easier than for a tear-off job because you can use the existing At the eave and the rake, install U-shape drip-edge flashing made for reroof jobs. D - Application on mansard and Steep Slope Roofs. E - High Wind Warranty. F - Cold Weather Application. G - Installing Over Existing Layer of Shingles. Install the second course just like the first, using the guidelines on the underlayment to get the correct overlap. When an ice dam forms on a roof (usually caused It is used in vulnerable locations on the roof deck that are most likely to The application instructions for each CertainTeed roofing product indicate the mini- form joints, and to completely fill all mole holes with asphalt that has been slightly It is used in vulnerable locations on the roof deck that are most likely to The application instructions for each CertainTeed roofing product indicate the mini- form joints, and to completely fill all mole holes with asphalt that has been slightly