Installed new panels in the greenhouse roof; the old ones going on five
years were badly degraded by the sun, very brittle and discolored by
green stains. I was afraid they wouldn't take the snow load this winter.
Here's a pic of an old panel and the replacement. You can see how
bad they had gotten:
Most of the new panels in place:
Looking out through the old panels:
Turns out that these panels are an upgrade; six mm thick
instead of 4mm. Much stiffer. They also have UV coating
on one side, which the cheapies that came with the green-
house didn't have. Will be interesting to see how they last
compared to the originals.
One interesting side note, the window frames will only hold 4mm thick
panels. So, I have to order another piece of 4mm so I can replace the
panels in the roof vent windows. The polycarbonate is easy to work with.
We were able to cut it with a Ryobi battery powered skill saw with a fine
tooth blade. I ordered 2' x 4' sheets; cheaper shipping, and only had to
trim the panels a little. I am going to replace the wall panels as well,
especially the south side ones. I'll use 6mm again - it is so much more
solid than the 4mm. Even the greenhouse frame is stiffer with these panels
in place! It has made a huge difference in the light inside the greenhouse.
I ordered 8 2x4 foot sheets for just under 150 dollars including shipping from
the Greenhouse Megastore. I wish the original kit had this quality of panels,
but for the price five years isn't too bad. I'm hoping for longer life out of these.