spatterdash

noun

1. A cement-based slurry applied to a wall in order to improve adhesion of the render.

   “A spatterdash treatment consisting of a cement:sand slurry may be used over the surface of these bricks to provide a mechanical key for rendering.”

   “Spatterdash can be used to produce an attractive appearance, or it can be applied before plastering in order to make a good surface for the plaster or render. Spatterdash is a wet, rich mix of cement and sand, called a slurry. This sand and cement is mixed to a proportion of 1:1,5 or 1:3. This slurry is thrown hard, or spattered, against the smooth block or concrete surface, and then allowed to harden.”

2. (form-of, singular)singular of spatterdashes (“type of boots”)

verb

1. (transitive)To apply spatterdash to.