. 2 ▁pounds ▁per ▁square ▁foot .). ▁Many ▁other ▁engine ered ▁woods ▁have ▁dens ities ▁much ▁higher ▁than ▁O SB . ▁ ▁Engine ered ▁wood ▁flo oring ▁manufact uring ▁ ▁Lam ella ▁ ▁The ▁l am ella ▁is ▁the ▁face ▁layer ▁of ▁the ▁wood ▁that ▁is ▁visible ▁when ▁installed . ▁Typ ically , ▁it ▁is ▁a ▁sa wn ▁piece ▁of ▁tim ber . ▁The ▁tim ber ▁can ▁be ▁cut ▁in ▁three ▁different ▁styles : ▁flat - sa wn , ▁quarter - sa wn , ▁and ▁r ift - sa wn . ▁ ▁Types ▁of ▁core / substr ate ▁ ▁Wood ▁p ly ▁construction ▁(" s and wich ▁core " ): ▁Us es ▁multiple ▁thin ▁p lies ▁of ▁wood ▁ad her ed ▁together . ▁The ▁wood ▁gra in ▁of ▁each ▁p ly ▁runs ▁per pend icular ▁to ▁the ▁p ly ▁below ▁it . ▁St ability ▁is ▁att ained ▁from ▁using ▁thin ▁layers ▁of ▁wood ▁that ▁have ▁little ▁to ▁no ▁reaction ▁to ▁clim atic ▁change . ▁The ▁wood ▁is ▁further ▁stabil ized ▁due ▁to ▁equal ▁pressure ▁being ▁ex ert ed ▁length wise ▁and ▁width wise ▁from ▁the ▁p lies ▁running ▁per pend icular ▁to ▁each ▁other . ▁F inger ▁core ▁construction : ▁F inger ▁core ▁engine ered ▁wood ▁flo ors ▁are ▁made ▁of ▁small ▁pieces ▁of ▁mil led ▁tim ber ▁that ▁run ▁per pend icular ▁to ▁the ▁top ▁layer ▁( lam ella ) ▁of ▁wood . ▁They ▁can ▁be ▁ 2 - ply ▁or ▁ 3 - ply , ▁depending ▁on ▁their ▁intended ▁use .