contigno
From LSJ
con-tigno: no
I perf., ātum, 1, v. a. tignum, to join together with beams, to furnish with beams, joists, or rafters (rare), Caes. B. C. 2, 15; Vitr. 1, 5; Plin. 9, 3, 2, § 7.
contignō, ātum, āre, tr., couvrir d’un plancher : Plin. 9, 7.