Insulating water tank in loft


M

MrFerrous

A relative has recently suffered from a burst pipe in their loft - it's one
of the cluster of pipes associated with the cold water tank and CH header
tank that they have in their loft. The 2 tanks are on an elevated platform.

To prevent future bursts, our plan is:
1) Remove all insulation from underneath the tanks (they are directly above
the airing cupboard).
2) Drape a couple of rolls of insulation such as
http://www.diy.com/diy/jsp/bq/nav.jsp?action=detail&fh_secondid=11127506
over the top of the tanks so that they hang down far enough touch the
ceiling joists. The intention is to insulate the tanks and all associated
pipes from the loft-air, and bring them nearer to the temperature of the
airing cupboard.

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

Does this sound OK?

Are we likely to get condensation problems if we completely cover the tops
of the tanks in this way?
 
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S

Skipweasel

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.
 
D

dom

Are we likely to get condensation problems if we completely cover the tops
of the tanks in this way?
Don't the tanks have close-fitting lids?
 
M

MM

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
 
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S

Skipweasel

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.
OK. I've seen loads - certainly more than the sort you describe.
 

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