[Raymond1947]

I have a slow, dull repetitive knock under (I think) the ground floor of the house. The floor is solid concrete. It is equally intermittent in time - about 5 seconds in between each knock and is not loud. The knock sounds like somebody gently tapping a concrete paving slab with a lump hammer at a considerable distance. I have checked the exterior of the house and can find nothing knocking the brickwork in the wind. The knock is much less pronounced upstairs - in fact it is barely audible in most upstairs rooms. We have recently had a conservatory built with a new radiator installed.

[parttime]

Hi Raymond and welcome, Did this noise start after the construction? Is the new radiators feed buried under your slab?

[Raymond1947]

Hello Parttime,

Thank you for your response. In answer to your questions the noise did start soon after the construction. The new radiator feeds are not buried under the floor of the existing house slab but run along the outside of the internal dining wall from an existing radiator. One runs underneath the existing radiator and then both go through the house cavity to the extension. They then run under the final surface of the extension slab to the new radiator which lies at the opposite end of the conservatory.

I hope the above makes sense.

Cheers,

Raymond1947

[parttime]

Hello Parttime,

I hope the above makes sense.

Cheers,

Raymond1947

Not completely Raymond, :confused:

But it would seem the noise is related to the new construction, more likely the new plumbing. Can you access the pipes? If so, try and secure them better. If possible, turn off water and heat for awhile and see if the noise stops. Maybe another will pipe in with a better idea. Good luck

P.S. you in the U.K.