Arris fillet

a triangular piece of wood used to raise the slates of a roof against a chimney or wall, to throw off the rain.

See under Arris.

arris fillet

[′ar·əs ¦fil·ət] (building construction) A triangular wooden piece that raises the slates of a roof against a chimney or wall so that rain runs off.

A triangular batten used to tilt up the lowest course of slates on a roof, at the edge of gutters.

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