Cov kev ua si nruab nrab ntawm cov kev ua sifov raws li qhov yuav tsum tau muaj yog qhov tseem ceeb tshaj plaws hauv peb cheeb tsam: qhov nyuaj, kev ua kom tiaj thiab kev nqus dej.
Feem ntau siv cov cassava dag paus muaj peb hom: asphalt foundation, cement foundation, gravel foundation, yam twg yog qhov kev txiav txim siab los ntawm kev nyab xeeb hauv cheeb tsam thiab ib puag ncig, lub sijhawm, asphalt lub hauv paus yog tsim rau qaum teb kub qhov txawv thiab lub caij ntuj no qis dua Kev nyab xeeb, Tab sis kuj vim tias nws cov nqi kim kim, rau qhov chaw sov thiab voj tsis zoo tshaj plaws, hom ntoo gravel vim nws yooj yim siv, qis dua, sai kua, ntau dua nyob rau sab qab teb, tab sis vim nws cov pluag hlau thiab ruaj ntseg, Tom qab lub sij hawm ntev ntawm lub sij hawm nws khoob rau hauv paus, ua rau lub hauv paus tsis plag; Yog li ntawd, nyob hauv feem ntau ntawm lub teb chaws, cement qhob puag tau ua kev lag luam thiab cov tswv yim, raug nqi-zoo siab heev dag dag hom.
