Dear Sudipto,
Load consideration for Roof is as follows,
1.Structural load due to roof structure - 50 kg/m2
2.sheets as roof - 35 kg/m2
3.Side load due to louvers -NIL
4.Live load - 100 kg/m2
TOTAL LOAD FOR DESIGN -  185 kg/m2 
If you have any concern, please let us know by tomorrow....