Rustication grooves, chamfers and drip recesses created to direct rain flow off building surfaces all require carefully detailed formers to achieve satisfactory construction quality. Contractors once had to cut all these pieces from wood, but now an array of ready-made products are available to do the job. Precut wood, elastomeric and rigid plastics, foamed plastics, and metal can be purchased in a variety of sizes and shapes. Some of the plastic strips have attached tails to seal the form joints and internal stiffeners to help maintain accurate dimensions.

Prices for these products range from a few cents to a few dollars per foot. To select the most cost-effective material for a job, consider its reuse potential as well as the project's architectural requirements. In most cases, using these precut pieces will save labor, speed construction and reduce the need for tedious manual cutting.