Choosing a proper set of green house plans is the first thing that you should do before building your greenhouse.
The second thing that you should do is choose the location of your greenhouse.
Your greenhouse should be located in an area that is well drained. If your greenhouse is used in the summer time for plant propagation then you should place it in an area that receives partial shade. This will minimize any excessive heat buildup.
A great location for a greenhouse is on the north side of a large deciduous tree. If it is impossible to find shade on your property then you can use a white plastic cover or shade cloth to the amount of sunlight that reaches the interior.
However, if you plan to use your greenhouse for growing plants to maturity or starting transplants then your greenhouse should be located in an area that provides maximum exposure to the sun. A green house should also be located in an area where there is easy access to both electricity and running water.
A greenhouse can be constructed in a variety of ways. Some greenhouse plans call for the use of PVC plastic pipe to make the structure. Other more traditional greenhouses utilize a wooden frame. Both of these types of frames are meant to hold either a clear plastic film or panels of glass.
Begin your construction by leveling the foundation. If you are building on a sloped piece of land you should dig a trench on the high side as opposed to raising the lower side. If the foundation boards contact the ground you are advised to use treated lumber only. Always make sure that there is a good floor seal to prevent any rainwater from entering above the foundation floor. It is also advisable to use a 4 x 4 inch post on each corner of the greenhouse to anchor the structure.
If you are using PVC pipe you will have a choice of either schedule 40 pipe or schedule 80. The schedule 80 pipe is preferred because it is stronger. One of the advantages of using PVC pipe is that it can be easily cut with a hand saw. You will need to be careful however when joining PVC pipe together with cement. The cement that is used to fasten the pipe is fast acting and permanent.
It will be to your advantage to place all of the PVC parts on a flat surface before assembly. It will also be easier to have two people perform the assembly of the PVC structure. Once you have completed the assembly of the PVC structure you will need to construct an end frame for the door. You will be able to fasten the end frame to the PVC ribs with wood screws.
Next, choose the type of plastic that you want to cover your greenhouse with. It should be either a 4 or 6 mil greenhouse film. Attach the plastic cover by using a staple gun. Finally, remember to always follow the set of proper green house plans as you construct your greenhouse.