Cov kev cai tswj tsev thaum cov qhov rooj hluav taws yuav tsum muaj nyob rau hauv cov chaw nyob thiab cov neeg ua lag luam. Rau lub tsev nyob, muaj ob qho xwm txheej sib txawv thaum lawv xav tau. Cov no muaj raws li hauv qab no:
- Yog tias nyob hauv ob lub tsev storey uas cov cuab yeej muaj qhov rooj tseem ceeb, lub qhov rooj ntawm cov khoom tseem ceeb thiab chaw nres tsheb yuav tsum yog lub qhov rooj fd30.
- Yog tias koj lub tsev lossis ua qee qhov kev hloov kho ntawm lub tsev uas yog peb lub tsev lossis ib chav stairwell yuav tsum muaj lub qhov rooj tsis sib haum.
