Metal tile roof

Instead of bitumen, I've decided to continue with metal tiles throughout. It'll look better. These tiles are not supposed to be used at such a shallow pitch, but because the Grace underlayment is such a good waterproofing product, the tiles will be more decorative than actual protection. Here you see the 1x4 and 2x2 battens nailed down to establish the grid framework. Rainwater, if leaked through, will flow under the 2x2, then into the gutter.