Crotch figure
BRE (Building Research Establishment) is an independent, research-based consultancy, testing and training organisation, operating in the built environment and associated industries. A guide to the use of urban timber (FB 50) was written by Geoff Cooper and published by BRE on 31 July 2012.
The guide defines 'crotch figure', or 'curl figure' as follows:
| Depending on the species and growth habit of the tree, most trees will branch from the main trunk into two or more large limbs from which the crown is formed. If the crown develops through the formation of two main limbs, the junction at which this occurs can generate material with highly decorated figure known as crotch or curl figure. |
| The term figure is usually defined as a pattern, distinctive features or markings which relieve the surface uniformity of a piece of wood. The term is most often used to describe a feature which enhances the attractiveness of a piece of wood. Figure can be produced by a variety of different mechanisms. |
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