You have been asked to decide between two roofing membrane options for a new project. Option 1 is to use a 4-ply #15 asphalt felt, mopped. Option 2 calls for PVC, 48 mils, fully adhered with adhesive. Option 1 is less expensive, but you estimate it will cost 10/ft2 in additional maintenance over the life of the building. Both are projected to last 15 years.Which is the better choice?
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