• use a border to frame an independent internal pattern within a circular or semicircular pavement area (Figure 12-53). This approach creates the most possibilities for elaborate patterns (Figure 12-52). In addition, this orientation minimizes cutting of individual paving units at the edges. There are two basic techniques for creating a pattern within a curvilinear paved area. Too many radii may create tight spaces between the radii and make it difficult to cut pavement units to fit. ^x-hension of oides Repetition of — form
conceothc circle quidefines — for pavement patterns
Figure 12-51
Pavement patterns in circular areas can be based on concentric circle guidelines. Figure 12-45
Emphasis can be created in a pavement area by using contrasting materials and/or patterns. Again, the internal curved lines should connect to the outside edge at a right angle (right side of Figure 12-54). • Borders, bands, and grids can easily be created within simple paved areas. These patterns can be either symmetrical or asymmetrical within the pavement, depending on the surrounding context and the degree of formality sought (Figure 12-46). A paved area and its internal design go hand-in-hand and need to be considered in concert with one another. • Likewise, the pavement can be subdivided into smaller areas that echo the overall form (right side of Figure 12-49). But straight lines can be introduced if the internal geometry of the shape is worked with. Rectangular Areas The pattern within a rectangular pavement area can be treated in a number of ways depending on the material used and the complexity of the overall shape. Wood is especially unsuitable to adapt to circular paved areas. • Directional patterns or those composed of unit pavers should be oriented parallel to the most prominent pavement edge for visual compatibility and to minimize cutting of individual units. As previously
Figure 12-49
Different techniques for establishing pattern edges within an irregularly shaped pavement area. • Use curved lines to subdivide the pavement into smaller areas. • Pattern lines and bands are best treated as extensions of corners and edges in complex rectangular paved areas (Figure 12-47). Figure 12-50
Pavement patterns in circular areas can be based on radii guidelines. • Use radii that extend from the center of the underlying circles within the curvilinear area to the outside edge. discussed, loose and adhesive materials are the easiest to conform to a curvilinear area. Nevertheless, there are four fundamental approaches for establishing material patterns based on the internal geometry of the circle. This creates a wider distance between radii and eliminates acute angles. The following paragraphs outline fundamental considerations for variously shaped paved areas. Curvilinear Areas Curvilinear paved areas are the most challenging to design patterns within because of the complete lack of straight lines and edges. Irregular Areas The pattern within an irregularly shaped or angular pavement area is usually more challenging to design because of the lack of parallel sides. Nevertheless, the following should be considered. The radii should be placed so that they meet the pavement edge at a right angle.
