HIPS and RIDGES are frequently covered with lead, as described at p. 232.

Slate Fillets are sometimes used to cover ridges. They are nailed on to the head of the ridge piece, so as to project and cover the joint between its sides and the top course of slates, the space between the under side of the fillet and the slates being pointed in cement.

Slate Ridging consists of a roll and sides formed out of thick slate. There are various patterns connected in different ways, which cannot here be described.

A common form in which the roll and one wing are in one piece is given in Fig. 455.

Another form having the roll and wings in separate pieces, the two latter being secured together with copper screws, is shown in Fig. 369.

The top of the ridge piece is kept higher than the slates in order that it may be bevelled off to receive the ridging.

Slate ridging is generally somewhat twisted, and very difficult to keep in straight lines when laid in long lengths.

Tile and Pottery Ridging is frequently used with slates, especially with those of a coarse description. In common work a semicircular tile is used, in Letter work tiles similar in form to slate ridging with high or " full crest" or low "half crest." The ornamental cresting may he detached, fitting into a groove in the roll.