Hi All. Last year the water board did some work on all the pipes in the road round our village, resulting, I think, in an increase in mains pressure. My question is, what sort of pressure is safe in terms of the risk of blowing pipework or joints? The setup is a mains stopcock in the garage, then the blue plastic pipe goes into the house and up to the loft before being converted to copper and heading out again through to kitchen, utility room and outside cold taps. Everything else is fed from a balanced pressure reduced feed in order to balance hot and cold in the bathrooms from the unvented cylinder. Being a geek I've fitted three pressure guages; one on incoming mains, one on post PRV cylinder feed and one on the boiler heat circuit. Post PRV pressure is around 3.5 bar as per manufacturer's spec, maybe rising to 4 bar if the water heats without any taps being used for a while. The issue is the mains which is typically around 6 bar static, though I have seen brief peaks of 7 bar when taps/showers have been going on and off. Is 6 to 7 bar ok or is that putting a strain on internal pipework and joints? The last thing I want is a joint in the loft popping and flooding the entire house. I should say it's been fine for over a year and may have been ok before that as I don't know what the previous pressure was to compare (though my neighbours reckon the pressure has gone up since the work was done). Am I worrying unduly or should I fit a PRV in the garage near the stopcock so that all of the pipes inside the property are never subjected to more than 4 bar? My thanks in advance for any thoughts.