i live in an old building which has been converted into 4 flats over 4 floors, however we only have 1 mains service pipe feeding all 4 flats, the water comes into the basement flat via an old lead pipe and then runs up the inside of the building through 15mm copper pipes. the pressure is ok when nobody else is using the water but on occassions when everyone is using the water the pressure simply disappears in the top 2 flats and no water appears. what i need to know is:
1. will 1 25mm mdpe pipe give enough pressure to feed all 4 flats if we run it on the outside of the building up to the top floor, and then have 4 feeds into each flat of 15mm pipe.
2. if number 1 wont work, will we have to run 4 25mm pipes from the main water supply from the pavement, so each flat has its own supply.
3. how can we ensure that the water wont freeze, what insulation do we need to put round the mdpe pipes.
anything else you can think of would be much appreciated.