City Lead Roof This Large lead roof was carried out in the city of London ,and was completed using code 7 and code 8 sheet milled lead .There were two mansard roof pitches that were renewed in welsh natural slates . Picture 1 This picture shows a detailed side on section of the completed lead roof Picture 2 This picture shows a cross section of completed lead roof. Picture 3 This picture shows the front of the completed lead roof . Picture 4 This picture shows the middle section of the completed lead roof.