Install the eave trim tight to the fascia and fasten it to the roof deck over the underlayment with one-inch roofing nails. In warmer climates, the eave is attached before the underlayment.

One of our readers, Rune Eriksen*, sent us photos of his design for a home-built deck drainage system, and we were impressed enough to check it out. His low-cost, easy-to-build under deck drainage ...