Tag Archives: woven poly
Well, not that long ago I showed you that a hoop-frame greenhouse could survive a Canadian winter. I should probably add “so far” to the end of that statement. We had a whole pile of snow (by central Alberta standards) over the past two days and I was away and thus unable to brush off the snow that was piling up on my greenhouse. So I was a little worried when I looked out this morning and saw my greenhouse looking like this.
The snow had accumulated on the top enough to start bending the pvc pipes and the roof began sinking. This is what it looked like inside.
On one hand, I was sad to see it getting squashed by the snow like that. But on the other hand, I was over joyed to see that although it had bent, nothing had broken! Everything was intact – just a little bent out of shape. So here’s another positive for using PVC pipe. It can bend quite a bit, still not break, and then resume it’s shape again when the pressure is off.
So I took out my shovel and scraped the snow back from the sides and brushed the snow off of the roof best I could. Some chunks were frozen to the plastic at the top, and I didn’t want to risk wrecking the plastic, so I left some up there. But the warm weather that will come eventually, hopefully, should melt that away.
While there certainly are some risks to this type of greenhouse structure (after all, I do live in Canada), and we’re not out of the woods yet (still six more months of winter… well, three at least), I still stand behind my PVC pipe greenhouse.
It’s December 12 in Central Alberta. Last week brought a lovely little blizzard with high winds and a whole pile of snow and this weekend we are looking forward to -35°C. Yup, must be winter. So, I figured it would be a great time to check on my little greenhouse. You know the one – the hoopframe greenhouse I made out of PVC pipes and covered with woven poly. Some people weren’t sure it would stand up the the wind and the snow and the cold temperatures, but I was confident. Mostly. So I ventured out in the -29.9°C weather this morning to see how well things were standing up. Here’s what it looked like:
Not bad so far. How about the inside? One of the biggest concerns is that the pvc pipes would snap or would bend under the weight of the snow. One nice thing is that Alberta snow tends to be pretty dry, so it’s not usually as heavy as the snow in other parts of the country. Regardless, it can still be pretty heavy when piled up. Well, here’s the inside.
Things are holding up well. Nothing has snapped, there is no major bending going on – all is bright and well. And, for an added bonus (for what it’s worth), it was -18.7°C inside while -29.9°C outside. Still really cold – but certainly a wide spread (and this only at 10am – by 2pm it should be significantly warmer from the sun).
So I must say I am pleased. I think this greenhouse is my best to date and I am excited to get some plants started out there earlier than I ever have before! I’ll keep you updated!
Update at 1:00pm later that day:
Ok, now it’s just -27°C outside, but a scorching -10°C inside! That’s 17 degrees people! Does that not impress you? I does me. I’ll have tomatoes in February!… Well, that might be a little wishful thinking…
I’ve finally built my greenhouse for my new garden. It’s a twenty by twelve foot hoop-style greenhouse with wooden ends and is covered with 11 mil woven poly. This greenhouse has some pretty cool features that I really appreciate, and I think you will too.
First of all, the poly I used to cover it is fantastic. It is a super tough woven poly that I got from Northern Greenhouse out of Manitoba. How tough is it? Well, my brother (who operates the Saskaberry Ranch near Sundre) just got pounded by hail last Sunday. The hail broke windows, shredded siding, and striped everything off of his saskatoon and raspberry bushes – but his greenhouse covered with this same woven poly was completely undamaged! Amazing! (I’ll try to post a picture if I can get one.)
Secondly, to eliminate wear and tear on the plastic, I covered edges of the wooden ends with copper pipe insulation. This foam protects the poly from the sharp edges of the wood.
Thirdly, it was very inexpensive and easy to build. The lumber was under $100, the poly was just over $200, and the pvc pipes were under $100. By the time I got all the misc. stuff, I was still under $500 total. Not bad, eh?
Being so late I only got a single row of tomatoes down one side, but next year I’ll be bursting at the seams once again! If you want to build a greenhouse like this one, check out my previous post that gives step by step instructions for building this same greenhouse. Since I’ve improved the design since then, I would recommend the following changes:
- Use wooden ends instead of plastic – and cover the ends with pipe insulation.
- Use 11 mil woven poly instead of the 6 mil.
- Put the PVC pipes on the inside of the frame rather than on the outside
Other than that, you should be able to follow all the other steps. If you do follow this design, be sure to leave me a comment – I’d love to hear (and see) what you’ve been doing!
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