[prob. f. BRANDER sb.2, as if to arrange cross-bars in the form of a gridiron; but cf. F. brandir under BRANDED ppl. a.2]
Hence Brandering vbl. sb., the covering of the under-side of joists with battens to nail the laths to, in order to secure a better key for the plaster of a ceiling (Spon, Dict. Engineer., 1869.)