Quote: That's what I was thinking of using (somehow the direct translation "cell plastic" didn't seem like the correct term), but the corrugated panels are pretty pricey here. I could get them pretty cheap from Estonia, but the shipping would double the price. And here, they're about 15-20 euros per square meter. I need about 12m^2, but due to the size the sheet's come in, it would end up costing about 200-300 euros and leave me with loads of offcuts. And from what I've read, at that price they don't tend to withstand our winters that well. The stuff that would be suitable for our climate would be maybe 500-600 euros. But maybe I'll just have to bite the bullet, or chance it with the cheaper sort.