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We are going to install a greenhouse this year. We have a small piece of property, so can't use anything bigger than 6 X 8. Can anyone recommend good resources or companies? Any opinions on polycarbonate vs glass? Wood vs aluminum frame? I live in the Pacific Northwest (U.S.), so it rarely gets below 20 degrees in winter.
Topics: I prefer glass and aluminium. Above is a link to a photo of my greenhouse in the UK. Aluminium needs less maintenance than wood. Aluminium looks better if it is coated green, but that increases the cost. If you can, get one with a cellular polycarbonate roof [for increased insulation] and glass walls so you can see out. The greenhouse in the picture is between 25 and 50 years old and looks brand new when you clean the glass.
You need to go and look at some locally. Get the makers names and the prices of the ones you like and then see if you can get it cheaper on the internet.
What I can say may be of less interest to You, as it applies mainly to temporary shelters erected during the cold season only. In this case, and when considering building it yourself, wooden frames sheeted with PE-foil may be worth a thought. I built mine two years ago and the first maintenance it has seen was a coat of linseed oil I applied to the fir-frames yesterday when braking it down for the summer. Yes, the increased moisture in it invites fungi, leading to darkening of the wood and ultimately to its destruction. If soil contact is avoided, life expectancy would be 4-5 years when made of ordinary fir or pine, possibly twice than that if built of more durable wood. New plastic sheeting is put on upon erection and removed when braking it down after winter. Important criteria are sufficient and controllable ventilation and strength to resist WIND- and snow loads.



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