1. Cov khoom siv hauv chav ua noj yuav tsum tau ua tom qab tag nrho cov chav ua noj renovation thiab tu tiav.
2. Cov khoom siv hauv chav ua noj yuav tsum muaj kev ntsuas kev tshaj lij thiab tsim qauv kom paub meej qhov ntev. Cov khoom siv hauv chav ua noj thiab cov khoom siv phab ntsa (nrog kho tau taw) yuav tsum yog qib. Seams nruab nrab ntawm cov khoom siv thiab cov txee yuav tsum tau waterproofed nrog silicone kom tsis txhob muaj dej to.
3. Kev nyab xeeb ua ntej. Xyuas kom tag nrho cov khoom siv hauv chav ua noj (hinges, tes tuav, ntsia) ruaj ntseg, thiab cov khoom siv phab ntsa tau ruaj khov.