We're doing a loft conversion, raising the hip to gable end and building a large dormer on the back (with nearly flat roof). We're slightly stuck, wondering whether to tile or render the dormer. Render seems to look good when it's newly done, but I'm worried it will crack quickly, especially because anything that high is bound to be more exposed to the elements. On the other hand, tile dormers of the size we're planning don't look great -- but presumably will be more durable? Any thoughts welcome...