Kawm paub yuav ua li cas kom raug nqi steel seem, xam cov nyiaj them los ntawm qhov hnyav thiab qib, thiab zam kev txiav tawm zais rau qhov nyiaj ntau tshaj.
Corrugated vs. galvanized hlau: dab tsi yog qhov txawv? Tshawb nrhiav seb cov qauv zoo li cas thiab cov zinc coatings ua ke kom ruaj khov, xeb-pov thawj vov tsev.