Rebuilt Portico Roof, Railing, and Trim July 31, 2013 / Administrator / Exterior Roof nearly needs to be completely rebuilt. Original tin roof had rusted through. Integral tin gutters ran behind the crown. Only one downspout (and a fairly flat layout) probably allowed more water to sit in the gutter. After. Rebuilt railing. Roof re-framed as hipped. New rubber roof and gutter. The old railing pierced the rubber roof and caused rot, so much of it that the entire entablature needed rebuilding.