Buying a used greenhouse presents challenges, as you balance the cost and quality.
While there are several things to consider, these are the most important factors.
Size Considerations Make your decision based on the number of plants you are going to cultivate.
If you are serious about planting or going to expand your collection, get the largest structure you can possibly find.
Larger structures will cost more, but you can actually save on expenses by buying one large unit now, rather than getting another one later on.
Of course, the available space in your garden will also be a factor.
Materials There are plenty to choose from: glass, fiberglass, PVC, polycarbonate, galvanized steel, wood aluminum and polyethylene are some of the most popular options.
All of them have their good points.
The important thing to remember is to make sure the materials are still in good shape.
Check if there are cracks or seams.
If there are, it is best if you look for another unit.
Other things to consider: glass is attractive, but they can break.
If it is wood, check what type of lumber is used.
Low quality wood will deteriorate quickly.
Coverings These determine the amount of light that can get to your plants.
It is also responsible for the protection of the unit.
As you look for used greenhouses, do not forget to check the R values.
R values determine the thermal efficacy of the unit.
Galvanized Steel Frames These are durable and low cost.
If you are going for this type, make sure the frame is made from stainless tubing or heavy-duty galvanized.
This will make the material more adaptable for outdoor use.
Aluminum Frames This material is often used together with polycarbonate.
Some are anodized and set in different colors.
While it is more expensive than other frames, it is the most durable.
Even if the aluminum is used, it does not rot or rust.
It is also resistant to UV rays.
However, you do need to look for designs that boost its strength.
Aluminum is not as strong as steel.
Plastic Frames Plastic frames are low cost, easy to set up and portable.
They are also being used by hobbyists because the heat loss is less compared with other frame types.
The problem is that plastic eventually deteriorates with constant exposure to UV lights.
The best kinds of plastic frames are the PVC protected types.
Reminders for the Buyer If you have never bought a unit before, learn as much about the materials as you can.
This is the only way you can get the one that suits your needs.
Second, examine the unit up close.
Bring a knowledgeable friend if you prefer.
Ask the seller anything and everything about the unit that concerns you.
Even if you are buying a used greenhouse, your plants will be able to benefit from it, provided the unit is still solid.
By assessing the materials as stated, you should be able to get a suitable structure that can help you manage plants.