Installation of shade over private terrace for a podium flat to protect life and property

A big fan of your website and how your advice is helping common man. I have a podium level flat (first floor - technically 4th due to parking floors), with private terrace in a high rise building (in Pune). Private terrace is mentioned in the agreement registered with PMC RERA. 2 issues - 1. Need to cover the private terrace bcos of falling garbage and objects (large pieces) - We have reported many incidences of falling objects in our terrace to the society committee and builder, including one large piece of plywood - which if fallen on someone could have been fatal. We intent to report this incident to local police. As the builder in the agreement has mentioned not to alter any thing in the terrace, the committee is tossing us to the builder for seeking permission and then they can consider giving permission to us. When builder was approached, he informs that since society is formed, society needs to take a call. Please advise, what action can be taken to protect life and property. Can we also approach PMC or any other competent authority to lodge the above mentioned incident, along with the local police station. 2. install solar panels to go with the central government initiative to Go-green. Thank you for your advice. Prasad S.