Hello Kitan,

You should treat your flat roof with mud ‘Phaska’ and lay brick tiles on the top of roof slab. It will prevent the roof slab from cracks due to direct heat, abnormal heat transmission into the room and will provide proper drainage of rain water.

For lowering temperature of the room or for reducing the heat through roof and wall of the house, click on the link below:

 ‘Thermal Insulation’

thanks