Kev xaiv ntawm cov khoom zoo rau loj - nplai ntoo cov khoom siv ncaj qha cuam tshuam rau kev nyab xeeb thiab kav ntev ntawm cov tsev ntoo. Kev tsim vaj tsev ib txwm siv cov ntoo ntoo xws li ntoo thuv, fir, cypress, thiab * Phoebe * (nanmu); Cov hom no sib txawv ntawm lub zog, hardness, decay resistance, thiab workability. High-cov ntoo zoo-tus yam ntxwv los ntawm cov nplej ncaj thiab qhov tsis xws luag tsawg heev- feem ntau yuav tsum muaj rau cov khoom loj-cov kabmob xws li kab teeb, kab, thiab purlins. Rau cov qauv tseem ceeb, cov ntoo uas muaj kev ua haujlwm zoo dua yog feem ntau xaiv raws li lub tsev kev faib tawm thiab kev ua haujlwm kom ntev mus rau cov qauv kev pab cuam lub neej.
Cov ntaub ntawv xav tau kuj txawv nyob ntawm qhov ua haujlwm tshwj xeeb ntawm cov khoom siv. Cov kab yuav tsum tiv taus ntsug loads kis los ntawm lub superstructure nyob rau lub sij hawm ntev, yuav tsum tau zoo heev compressive zog thiab stability. Beams thiab khi-beams yog feem ntau raug khoov quab yuam, yuav tsum tau muaj zog flexural siab thiab toughness, thaum purlins yuav tsum sib npaug load- bearing muaj peev xwm nrog rau deformation. Thaum lub sijhawm xaiv cov txheej txheem tiag tiag, yam xws li cov ntsiab lus noo noo, pob qhov rooj, cov kab nrib pleb, thiab lwj yuav tsum tau ua tib zoo xav txog, vim tias cov khoom no cuam tshuam rau cov khoom siv kho tshuab thiab lub neej ntev ntawm cov khoom.
Qhov zoo ntawm kev ua thiab kev cia khoom kuj cuam tshuam rau tag nrho kev ua tau zoo ntawm cov ntoo loj. Kev tsim khoom feem ntau suav nrog kev xaiv cov khoom, txiav, ua, thiab ziab, ua raws li kev tsim khoom raws li cov khoom siv tshwj xeeb. Kev cuam tshuam ntev rau qhov chaw ntub dej thaum lub sijhawm ua haujlwm tuaj yeem ua rau muaj teeb meem xws li kev lwj, kab mob, thiab tawg, yog li cuam tshuam cov load-cov kabmob muaj peev xwm. Yog li ntawd, kev tsim kho thiab kev khaws cov ntoo loj loj yuav tsum muaj kev txiav txim siab ntawm cov ntoo raws li lub tsev ib puag ncig thiab cov yam ntxwv ntawm kev thauj khoom, nrog rau kev siv cov dej noo tsim nyog- pov thawj, tiv thaiv - kev kho kom lwj, thiab kev saib xyuas.