Hi All, hope you can offer some help with my problem. Weve recently bought a house that was built in 95. The probelm we have is that there is a ticking or clicking noise coming from the walls. I've read alot that it is expansion and contraction of the pipes as they warm or cool but ours has the following symptoms. Its just the downstaors walls. Nothing from the floors uptairs it occurs as soon the boiler and pump kicks in it continues even when fully upto temp it doesnt do it when cooling down its in ever wall with a radiator It makes me think that its not expansion as it does it when it first kicks in and heat cant have gotten to it that quick, continues and doenst do it when coolign down. Saying that I'm no plumber Any help would be appreciated.