On Thu, 30 Dec 2010 19:40:12 -0000, Skipweasel wrote:

In article ,
says...
It's going to look like a giant glass-fibre tea-cosy when finished.

Does this sound OK?

It's what everyone else does. Or at least are supposed to. Works fine
here and elsewhere I've seen it done. Provided you don't leave the house
powered down for extended periods, that is.

I've NEVER seen a loft where the water tank was draped in rockwool
insulation. My own tank has a lid and a thin plastic insulation
"pillow" lying on the top. Inadequate, in my view.

Shortly before leaving to go away for Christmas, the bitterly cold
weather was really starting to worry me, so I did what the OP
suggests. I ripped up some of the insulation (from the joists) and
draped it over the pipework. The pipework had already been insulated
by the builder, but as yet another example of shoddy workmanship the
elbows and T-joints had been left naked to the air. So I wrapped small
pieces of foam tube around them, too, before applying the ripped up
rockwool. I also left the loft hatch open and left the CH/hot water on
medium for a few hours a day.

In 2011 I shall fit a 60w greenhouse heater tube near the pipework and
a remote (wireless) thermometer that I can monitor constantly in cold
weather. One cannot be too careful and the thought of a major pipe
failure fills me with horror.

MM