Italian to English Tech/Engineering Construction / Civil Engineering bill of quantities

this is from a refurbishment of a an antique palazzo and the repair of a a false ceiling (volta) made with plaster and cane with a wooden ribbed frame

The sentence reads
Rafforzamenti delle centine portanti con doppie tavole sagomate dello spessore di cm. 2.5 fissata con chiodi o viti mordenti e tambocciatura con morale da cm. 4 x 8 o 8 x 8 in sostituzione di quelli rotti o mancanti.

Does someone know what this word means? Is there an equivalent in English.