I would not attach bubble-wrap directly onto your panels, as the sun will cause the tape to get gummy and transfer to the expensive and difficult-to-clean-without-etching polycarb. What I would do is tape it to the frame (there is double-sided tape for greenhouses), which will also give you an additional 2" airspace. If your frame is wood, then staple. Don't use too many staples, so it's not a major pain to take down in the spring. A flat-head screwdriver works well.

-Bruce C.

When I had a polycarb g/h, my husband drilled holes in the frame, and then poked holes in the plastic, and tied them up with string.

riley17: Our bubblewrap is attached to the frame horizontally using fender washers and self-tapping screws. Tape in some places. It stays up year round. There is no reason to remove it in the summer just to replace it in the fall.

thank you very much. im going to try the tape first since i already have some.

Don't laugh, but it worked....

When we installed extra heavy bubble wrap in my GH, the vertical walls were no problem, as I bought it in a 2 ft. width, so it snugged in between the aluminum polybars nicely. Then we used heavy tape to seal it.

The problem was keeping it from sagging down from the curved eaves and ceiling and for that, I used spring loaded curtain rods set about every 2 ft. The rubber tips on the rods fit tightly against the frame, yet don't rub the paint and hold the bubble in place.

I also agree that once in place, it should remain. With an aluminet shadecloth and lots of ventillation, My GH held reasonably cool last summer, but the bubble only went up in the fall and now, with the bubble in place it never gets much above the 74 deg. I have the intake vent/exhaust fan combo set at. When it hit 92 a few weeks ago, the upper air in the GH got up to 80, but from about 5 ft. (my eye level) down, still topped out at 76.

BTW: One of the handiest tools to spot check temps is a gadget I received as a gift for my fish tanks. It's an instant digital thermometer. All I have to do is slide a button on it to push the probe up to turn it on and it reads accurately in a few seconds, so I can spot check water OR air temps in any part of the GH, doing a pretty full sweep in minutes. It works as well in soil too.

As Granny would have put it: "Goodness! What will they think of next?" LOL!