If the basement has ventilation to outside, the answer is yes. Heat loss from the pipes will escape outside the house.
If the basement is closed to the outside then no, the pipes need not be insulated. Any heat lost from the pipes will provide some heating to the basement that will rise into the house.
You should not have air in your pipes. Call a plumber.
Additional shut off valve, below sink or in basement. Incomplete pipes not tied into bathroom sink line.
Should be the same, when your home was originally built, it was pressure tested (without water). This assures that there is no leaks in the entire home, if the plumber knew what he/she was doing they designed the system to have the larger dimension pipes closer to the water meter and if designed correctly the furthest pipes from the water meter are the smallest dimension pipes in the house. This assures that when valves are opened in different parts of the house there is a greater likelihood of a maintained service pressure. Of course if you open a downstairs faucet (say a kitchen sink) and are doing laundry (in the basement) and then try to take a shower in an upstairs bathroom you will notice a drop in pressure.
Insulating your copper pipes is a great idea. Insulating with foam will insure less heat loss which save energy and probably take a few bucks off your electricity bill.
no they are not
Do you have problems with frozen pipes? Does someone live in the basement? You won't lose much heat through the basement because heat rises.
a hydronic system
I see no reason why you would insulate them. When you close your pool for winter you will purge (empty) your pump and pipes. The water in the pool would freeze long before the water will in the pipes under ground.
28 degrees above zero (Fahrenheit) for more than 4 hours will freeze your pipes, so insulate, insulate, insulate.
to insulate and/or reinforce
A boiler with a circulating pump and pipes to convey heating water around a house, through radiators or underfloor pipes.
It's colder in the basement than the water coming in the pipes. Seal up the vents and drafts in the basement. Wrap the pipes
With rubber or circular foam that you can by from any hardware store
well depending on the type of building and also depending on how old the building possibly is could depend on weather or not you would need to insulate the pipes.
No this is not necessary. Install the pipes as per usual. You can insulate the hot water pipes up to two meters or up to two yards from the hot water outlet from the hot water tank to prevent this. No this is not necessary. Install the pipes as per usual. You can insulate the hot water pipes up to two meters or up to two yards from the hot water outlet from the hot water tank to prevent this.
Insulating the water lines in your home can save you money and trouble. Water can collect in your pipes. In the winter this can be especially troublesome as the pipe could freeze. If this happens, the force of the water expanding during freezing can cause your pipes to break. Insulating the pipes can help avoid this from happening.
In general, you should avoid putting plumbing on the outside wall if you live in a freezing climate. If you MUST use the outside wall, insulate heavily to the outside and do not insulate between the pipe and the heated area of the house and leave a space for heated inside air to ciculate around the pipes.