With the outer walls of the second storey complete, our contractors start building the new roof over the extension. This has three sloping elevations and will need to be cut in to the existing roof.
The first job is to set the wall plates. These are timbers on top of the new walls onto which the rafters will sit. A couple of slates are removed from the existing roof where the new walls abut so that the existing wall plate can be exposed. The new wall plates are then bedded in sand and cement mortar on top of the walls and are joined at the corners with halving joints.