viyadama wadi. Columns dekak athara dura (Span) eka wadi welawata timber walin karanna bari wenakota steal beams daana eka thamai saamanyayen karanne. Pinthure thiyenawa wage cantilever length eka wadi wenakotath steel beams daanawa. Ehema nathnam trusses (sinhalen kaappa) daanna one.