We have a cellar in our Victorian terraced home. The living / dining room are freezing in winter and we are thinking of insulating the ceiling in the cellar to prevent this. Can we use normal loft insulation which we then board over with hardboard. Is this ok and will ita cause damp / prevention of airflow? We do have an airbrick at one end of the cellar and are not going to block it in any way. Will this suffice?