ABSTRACT
Figure 12.1: The three types of roof to contend with are flat, lean-to and pitched. Timber is used for the skeleton
with sheet-boarding and (for economy) bituminous felt in built-up layers. Pitched and lean-to roofs are covered with quarried slates (which are very expensive) or nonasbestos-cement slates, blue/black in colour, a cheaper lookalike, clay tiles (also expensive) or, more commonly, concrete tiles on battens and roofing (sarking) felt.
