On 24/07/2010 05:34, MrsTrellis wrote:
Hello. I'm new to this forum, but am a longstanding gardening
enthusiast.

I have experienced a problem with the installation of twin-wall
polycarbonate panels in my small greenhouse, and I wondered if anyone
else has the same problem. I was spurred on by Bunny Guinness’s article
in The Telegraph, 10 Nov 2009, extolling the virtues of twin-wall
polycarbonate panels to replace horticultural glass. During Spring this
year, there were suddenly several suppliers selling polycarbonate online
at very tempting prices. I plunged in and bought new panels, together
with the aluminium tape and breather tape for sealing top and bottom cut
ends respectively. I replaced all the roof panels of my greenhouse, and
all seemed well. However, less than 3 months later, the breather tape
has come unstuck on all panels, allowing debris and mould to start
moving up, inside the channels.

The supplier denies hearing of anyone else having this problem. Please
can anyone throw any light on why this breather, ‘anti-dust’ tape has
failed to do its job?





My reply is not very helpful I'm afraid, in that the same thing happened to me when building a car port,
I suspect however that part of the condensation/debris that occupies some of the channels came from an
inadequate seal on the centre fixing buttons which I had to use because the sheets were quite wide.
I've just lived with it, however I can appreciate that a clean car port roof is not as important
as a clean greenhouse roof.
Regards
Don