Connecting to a copper line under the slab will require that a copper to pex fitting be soldered on.
Lines in attic copper.
Line the split up and make sure the adhesive glues the rubatex split together.
After making the connection all pex fittings are installed with a crimping tool eliminating.
That should fix your problem with the sweaty copper pipe.
For other homes the pipes might be located in the walls or the roof rafters.
Find out where the pipes are located to see if a ladder is needed to reach them or if you will have to work on your knees installing the insulation.
Galvanized steel copper brass or csst corrugated stainless steel tubing also can be used in some areas but some utilities specifically prohibit the use of copper.
You will need to locate the pipes in your attic obviously to measure them and know what level of difficulty you will have in covering them.
The attic space it s in is much smaller with no outside vents and no sweating little copper lines.
Thinner copper pipe carries liquefied refrigerant its temperature is approximately 110 f 43 3 c does not require insulation but in some installations insulating liquid refrigerant line is recommended.
You should know what is acceptable in your area.
You want to create a vapor barrier to keep the humidity out and away from the pipe.
For some homes the pipes will run underneath a subfloor or at the bottom of the attic.
In other areas the use of copper is widespread.