Siv lub rooj tsavxwm nas yog yooj yim; muab ib co bait rau hauv nruab nrab ntawm lub ntxiab thiab muab tso rau hauv qhov chaw uas nas nquag. Lub ntxiab tuaj yeem muab tais rau hauv plaub qhov sib txawv - "ib qho", "90 degree" puab, "U" puab, thiab "lub qhov ncauj" puab - raws li qhov chaw, tshem tawm qhov yuav tsum tau kov cov kab tsuag. Kev pov tseg kuj tsis muaj zog; tsuas yog muab cov ntxiab nrog cov kab tsuag uas nyob hauv lub thoob khib nyiab.
