The first step is to choose the most appropriate site for the greenhouse. It should ideally be placed in a sunny spot that is not surrounded by trees, and is sheltered from strong winds. Sufficient space should be left around it, as to allow easier access for repairs if needed and if electricity will be installed, it should be closer to the house.
The need for heating in the structure primarily depends on the types of plants that will be grown inside it and when it will be used. Extra heat is a must if growing seedlings during the winter for instance. Greenhouses can be heated with electricity, gas, or paraffin, which all provide higher temperatures. Bubble-wrap insulation can work too, but results in less heat. A constant minimum temperature of 45 degrees Fahrenheit or more is recommended.
Its glass walls need to permit sufficient light to enter, and should be able to stand up to years of use and exposure to the elements. These can be made from traditional glazing glass, polycarbonate safety glass, or toughened safety glass. The latter two are more resistant to shattering, however they allow less sunlight in, while the former is more readily replaced if needed and encourages maximum light entry.
The frame may be made from either wood or aluminum. The former usually has a nicer appearance, and can have either full or half-glass walls, but is also more expensive. The latter costs less and provides ultimate durability as it is not subject to rot like wood is, the aluminum may be left plain or have a colored powdered coating applied to enhance its appearance.
In order to ensure suitable airflow in the structure, adequate ventilation is needed. This is done most effectively by installing both roof vents to eliminate hot air, and side vents to draw in fresh air from outside. Solar power vents and automatic vent openers make it easier to control their operation.
There are other details pertaining to the structure of the unit which one should take into consideration, such as the base design, type of flooring, doors, and roof shape. The greenhouse's size is mostly dictated by the nature of the plants that will be grown in it. A base helps prevent wood-rot and provides stability. Doors can be either sliding or hinged styles.
Once the greenhouse is in place, details such as staging and benching, and a water storage system can be installed. Benching and staging are shelves where potted plants grow, they can be either slatted or solid according to the needs of the plants. Regular storage shelves can be placed underneath these units. Most gardeners will collect water from the roof of the structure for use.
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