can't remember

jumper

Talking about the past. In the fifties ceilings were plastered. Embed soft copper in ceiling for radiant heating. So what about expansion? Can plaster be formulated to expand at same rate as copper?

Gordy

have them

Plaster has nearly the same coefficient of  expansion as copper tubing.

Usually radiant ceiling of that era do not need to run very high water temps. 115 tops in my case at design conditions.



Lucky enough to have the original chase copper and brass literature they boasted much higher temps possible with out damage. I think there is a similar copy in Dans library.

The only exception to the expansion was larger rooms the plaster at where the ceiling met the walls was left open for expansion concealed by crown molding.

I have no such expansion reliefs in my house with the biggest room being 15x 36.