Thaum xaiv cov pob zeb phab ntsa, cov hauv qab no yuav tsum tau xav txog:
Txoj Haujlwm Yuav Tsum Tau: Xaiv cov pob zeb uas tsim nyog raws li kev thauj khoom -cov kabmob thiab hnav tsis kam.
Environmental Conditions: Phab ntsa pob zeb uas tsis muaj dej permeability yuav tsum tau xaiv rau qhov chaw ntub dej.
Aesthetic Requirements: Xaiv cov xim thiab cov duab raws li tus qauv tsim.
