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Trelystan Church, Montgomeryshire. Decorative arched wind braces between purlins- 15th-16th century

In architecture, wind braces are diagonal braces to tie the rafters of a roof together and prevent racking. In medieval roofs they are arched, and run from the principal rafters to catch the purlins. [1]

References

  1. ^  One or more of the preceding sentences incorporates text from a publication now in the public domain Chisholm, Hugh, ed. (1911). " Wind Braces". Encyclopædia Britannica. Vol. 28 (11th ed.). Cambridge University Press. p. 708.