Curious if anyone knows when copper pipes are frozen when will the damages occur?

Is it at the moment water expands when it freezes or later when it melts?

I am asking because I have an exposed copper manifolds on the exterior wall where the incoming 3/4" splits into different branches to go to first floor, second floor, irrigation plus a few hose bibbs. In fact I have a similar setup in various properties, where the copper pipe main feeds come out of the ground, along an exterior wall, and turns a 90 to go inside the house's wall.



I am located in Fort Lauderdale Florida so frozen pipes are not a concept on my mind at all, until yesterday we got the arctic blast and Fort Lauderdale at 6am dropped to 34 degrees but the gusts made it feel like 26 degrees. It is 48 degrees now but this conditions will repeat again tonight, dropping to 34-36 degrees with spots of even lower temperatures.

I haven't touched anything yet, and I wonder what is the chance I already have damages. May be water never froze but at an average low or 34 last night, who know what actual temperatures were. Is there anything I can do now to check or prevent future damages?

For example, can I boil some hot water and pour that onto the copper manifold to cause the copper to expand?

Should I open all the exterior spigots?

Can't believe this didn't come to mind or I would have put together a cardboard box cover over it and cover that with a thick moving blanket and leave one inside faucet slowly dripping to keep water moving last night.

The answer seems obvious to me - splits occur when the water freezes.

It takes sustained below freezing temperatures for the pipes to freeze. 34*F is not going to do it. Nothing to worry about at all.

Forget about pouring hot water. It is not going to help

If the temperature dropped to 31 or lower continously for about ten hours or longer, then it is time to worry.

I am in Toronto and am very familiar with frozen pipes. Just this week, I had two customers wuth frozen pipes.

Pipes don't freeze instantly at 32*, it takes hours at sustained low temps. The wind is a factor, if you can add cardboard or a moving blanket, etc that will help. Unlikely you'll have issues at the temps you mentioned. If any of these outdoor pipes get sunlight at all that's a huge help.

Talking about damage...water expands when it freezes, so prolonged cold temps damage pipes when they freeze solid and the expanding ice splits the pipe. That's the damage to the pipe....the real damage occurs when the pipes thaw and water sprays out of the split in the pipe that was sealed by the ice. These are outside, so worst case if you had a pipe freeze, burst, and then thaw the water would be outside the residence, not inside.

Sum,

Ex-Floridian here. Pipes have to experience sub-32F temperatures for a prolonged period before they freeze. Given that the pipes in the photo are up against the house, the temperature is higher there and wind chill less severe. It would likely take hours in the 20's for those to freeze.

If you are a zero-risk kind of guy, the simplest solution would be to install pipe insulation, which probably doubles the exposure time required. Be thorough with your coverage, you know how cold it gets at the exposed joint between your jacket and your mittens.