Insulating Internal Pipes. What is the correct answer

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I have read a lot of posts on here and other forums and still not got a straight answer.

Do central heating pipes need to be insulated. I (personally) think that pipe run under the ground floor and so prone to huge heat loss are a no brainer but what about within an upper floor void with heated rooms above and below.

There is the argument that any heat lost from the pipes will just heat the room they run within but surely the radiator does a far more efficient job of that and any heat lost before the water gets to the rad reduces that efficiency.

At a cost of £10-£15 a room the cost is irrelevant, i just want to know what is the correct (not necessarily most regularly seen) answer.
 
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The correct answer is that all pipes should be insulated.

Even with a void between floors, heat loss can be significant and there is no guarantee that the heat will end up in the room above. Such spaces may be open to wall cavities and similar, and any airflow will carry the heat to places it's not wanted or needed.
 
Installed and insulated. The sleeves are butted tight. Do they need tapeing or is that OTT? If so what do you tape with.
20210124_155621.jpg
 
Looks good, I was going to mention that in your other post. Duct tape is ideal but not required if it is all tight fitting.
 
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Got anther thread going n that topic as I don't like the idea but the fitting spec says they can be covered with fibrous insulation.
 

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