English to French Tech/Engineering Construction / Civil Engineering Building cost estimate.

Contexte :

Construction d'un entrepôt à oignons au Brrkine Faso :

"XXX foresaw ( ... ) will need the building of a warehouse of 70 iron sheets which is 4 000 000 F CFA, ( ... ) the execution cost of this warehouse is made as follows:
Iron sheets (269 360 f cfa) ; INP 80 (205 000) ; IPN 120 (170 000) ; *** quavers (30 000) *** ; tightening steel (18 000) ; concrete iron of 6 (140 800) ; concrete iron of 8 (67500); concrete iron of 100 (100 800) ; iron thread (12 500) ; planks (84 000) ; nails 80 (16 000) ; doors (145 000) ; windows (115 000) ; wheelbarrows (17 500) ; shovel and pick (3 000) ; office ceiling (80 000) ; Cement (1 380 000) ; Transportation of material (80 000) ; labor (1 039 540); the population provides stones, sand and water."

30 000 de ces quavers ...

Comment traduire quavers ?