Hot Water Heat Issue

I recently added an addition to my house and added an additional hot water heat zone. This zone consists of the extra space added during the remodel and previous room space from another zone. I know have a situation where the newly added copper lines make a knocking noise when heating up. How can I address this knocking sound?
Looking forawrd to a good nights sleep.
Thanks.
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You have options. 1) Call a professional. 2) Isolate the general location and peel back the new construction to the piping and redo it to take care of the thermal expansion. Better resilient mounting may help, you may need trick expansion couplings, There's a world of neat stuff out there to make it easy. Good luck.
Joe
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Knocking is usually from the tubing expanding and rubbing the studs or mounting brackets. If you have long straight runs it is more likely to occur. The best was to eliminate it is to have expansion loops in long runs. If the tubing is coming up through a floor and then going back down, it will help to enlarge the holes the tub passes through to give it more room to move.
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