Re: Plaster Ceiling Cracks Hydronic Heat
If the copper piping in the ceiling is embedded into the plaster then I could see this happening. The copper tubing expands a fair bit and the plaster wouldn't move at the same rate. Since plaster is rigid it would crack because it's not forgiving to movement.
It may be a matter of the water running through the piping is too hot causing too much movement of the copper piping. In which case it would be a matter of reducing the temperature of the water supply to the ceiling loop.
Whether or not this would remedy the problem is just a guess.
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