"Brian Watson" wrote in message
...

"Paul Giverin" wrote in message
...
Hi there,

This year, after many years of threatening, I finally got a greenhouse.

...The greenhouse is erected on a concrete plinth that
was previously used for an aviary. I felt (rightly or wrongly) that I
needed to do something to insulate the concrete because I though it
would be quite cold.

Psst. Carpet tiles.
harbour mould spores :0)