When we moved into our house a couple of months ago, there was no lid
on the domestic cold water tank in the loft. I cunningly fashioned
one from a sheet of exterior ply, but now find, only two months later,
that there is a horible layer of green mold on the underside of the
Can anybody suggest a more suitable material?
[The tank looks to be fibreglass, and so I'm fairly sure that a
'standard' plastic lid will not fit]
The mould is due to condensation forming on the underside. This wouldn't happen
if the lid was of rigid insulation board. 20 years ago I made a lagging set
(including a lid) for my F/G tank using 50mm polystyrene board held together
with 4 nails pushed in. It's still OK and there's no mould, except particles of
the polystyrene sometimes fall in the water so I wrapped the lid in a bin liner.
If I was doing it today I would use Celotex or Kingspan.
Hey Mike, fancy meeting you here in the repository of all diy knowledge.
You get lots of condensation on the underside of the lid, ideal mould
growing conditions especially on something absorbent like wood. A nice
smooth piece of plastic would be better, got any conservatory roof
offcuts or anything like that?
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