Constructing a greenhouse requires you to finalize a design or style. A variety of greenhouse designs are available to choose from. You can take your pick according to your requirement, style, taste and budget. Greenhouse designs are broadly categorized into three types: attached, ridge or furrow, and detached.

Attached greenhouses

Lean-to greenhouse: When space is limited and you want to save up on costs, an attached greenhouse is a good option. The lean-to greenhouse has a ridge line that is attached to one wall of your home. Usually, a connecting door provides direct access from your home to the interior of the greenhouse. Proximity with the main structure of your dwelling provides easy access to power sockets and water source. The lean-to comes with straight or curved eave design. The roof is always sloping to allow snow, rain and leaves to slide off.

Window greenhouse: The smallest of all the attached greenhouses are the window mounted variety with just two or three shelves that can accommodate a few of your favorite plants.

Even-span greenhouse: It can be put up as an attached or a free-standing structure. In the attached variety, one gable end is attached to the end wall of another building. It is the largest of the garden greenhouses and has the advantage of allowing you to lengthen it if you start on a budget and later decide to upgrade and upscale the structure. It scores over the lean-to in having a design that is more efficient as far as heating, cooling, ventilation and optimum use of available space are concerned.

Ridge or furrow greenhouses

These are generally free-standing structures with gabled or arched rooflines. These are attached only at a common gutter at the lower edges of the eaves of the roof with no division by walls of the structure under the canopy. The curved arches are preferred if you are planning to use flexible glazing material like polyethylene. The gabled roof can have more rigid material like glass or fiberglass. Being relatively large, this type of greenhouse is usually built by commercial growers.

Detached greenhouses

These are independent or stand-alone free standing structures situated away from the home. They have the advantage of being larger and admit more sunshine as there are no shadows of an attached structure to hamper sunlight.

Quonset greenhouse or hoop house is a popular option because it is quite inexpensive and easy to put up. It is arched and uses light weight framing over which flexible glazing can be stretched.

The Gothic arch greenhousehas great aesthetic appeal. It consists of two separate curved pieces that meet at the ridge line of the roof. As the curvature is less pronounced than the Quonset, it provides more head room and usable space.

Classic A-Frames look like the alphabet ‘A’ when put up. They are easily assembled on the ground before being erected, but have relatively less usable space.

Modified A-Frame greenhouses are shaped typically like a house. With straight vertical walls topped by gabled roof without eaves, they have more usable space than the classic A-Frames.

Barn style greenhouse has greater usable space as the peaked roof slants to meet eaves on either side of the ridge line. The eaves at the roof’s edge connect it to the sidewalls. The sidewalls may be straight or slanted; the latter providing for greater sunny span.

Dome greenhouses are semi-circular. They are great for minimizing wind resistance and allowing maximum light transmission.

Each of these basic greenhouse designs has its own plus points as well as limitations. A little research would go a long way in allowing you to

Bill Keene is a former farmer and author of of the “Building A Greenhouse Plans” and website http://www.buildingagreenhouseplans.com

Article Source: http://EzineArticles.com/?expert=Bill_Keene
http://EzineArticles.com/?Basic-Greenhouse-Designs&id=2808327

Follow these tips to cut costs and build a cheap greenhouse:

o Use all available resources to gather information. Turn to the internet, library, local bookstore, friends, seasoned gardeners, garden accessories retailers and any other resource that you can think of. Draw comparisons and analyze options available.

o A DIY kit, portable or hobby greenhouse would substantially save money. Limit the size of your greenhouse to small so that you can save up on heating, ventilation or cooling.

o To build the structure yourself, scout for secondhand or used lumber in your neighborhood. You might be pleasantly surprised to get much of the needed timber for free or at throwaway costs. Wood is an excellent choice for the framing material as it is a non-conductor and your greenhouse will lose less heat through the framework during winters. Also, wood is very easy to work with.

o Go in for a lean-to greenhouse so that a portion of your greenhouse comes ready made. Plus, proximity to the house would provide easy access to water and electric supply.

o Look for a spot in your yard that does not need you to spend substantial time, money and energy in clearing and leveling. Keep in mind the orientation and availability of sunlight.

o Poly films or polyethylene are inexpensive choices for glazing. PVC framework will not hold up glass well, though it works perfectly for lighter glazing. Hold the PVC framework down with weights at the base if you are in a windy area.

o If you have managed to obtain glass for paneling, be sure to support it with a heavy framework of wood. If you are a die-hard glass glazing fan, look for discarded tempered glass sliding doors at recycle shops.

o A hoop house is the perfect temporary structure that would really fit into any budget. You can use PVC framework and then cover it over with ordinary clear plastic sheets from your local hardware store.

o It is easy to ventilate a hoop house in summers by simply opening up flaps as needed. Hoop houses are efficient at trapping heat and can generally be left unheated. They are perfect for over-wintering plants.

o For benches and shelving look for used treated timber benches or tiered plastic racks that can tolerate water.

A final secret to build a cheap greenhouse: some greenhouse owners may be upgrading to bigger and permanent structures. So, keep an eye on the newspapers for ads for a discounted second hand hobby or portable greenhouse! You could end up with the bargain of your life!

Bill Keene is a former farmer and author of of the “Building A Greenhouse Plans” and website http://www.buildingagreenhouseplans.com

Article Source: http://EzineArticles.com/?expert=Bill_Keene

http://EzineArticles.com/?Build-a-Greenhouse-on-the-Cheap&id=2767941

In layman’s terms, a spectral frequency can be defined in terms of the following principle: any object in the universe emits, radiates or transmits light. The distribution of this light along an electromagnetic spectrum is determined by the object’s composition.

Therefore, the glass of a greenhouse traps energy within the greenhouse and the heat in turn provides heat for the plants and the ground inside the greenhouse. It warms the air near the ground, preventing it from rising and leaving the confines of the structure.

For example, if you open a small window near the roof of a greenhouse, the temperature drops significantly. This is because of the auto vent automatic cooling system. An autovent is simply a device used by greenhouses that maintain a range of temperatures inside. This is how greenhouses trap electromagnetic radiation and prevents convection (transference of heat by currents within a fluid).

Curious about how the idea of a greenhouse came about? It goes back to the days of the Romans, who – as history annals show – were the first people to create a structure to protect plants. Using heated pits, they put up slabs of rock to form primitive greenhouses. The term “glasshouse” which is the correct name of this structure, was adopted sometime in the 17th and 18th centuries.

At that time, however, the error was in believing that heat was more important than light for plants to thrive. Structures were being built to exclude the entry of light, but by the time the glass tax of 1845 was abolished, the design of greenhouses started to change.

Builders realized then that a curved roof instead of a flat one allowed higher concentrations of the sun’s rays, and that by using iron instead of wood, the greenhouse could be structurally reinforced and made capable of absorbing more light.

A good alternative is to own a hoop house type of greenhouse. These are very simple greenhouses which can be assembled very easily. There are many advantages in having a hoop house greenhouse, here are some of them:

-Availability of more growing time
A hoop house greenhouse provides a gardener more time to cultivate his favorite plants. An extra 3 to 4 months can be extracted for planting more crops in the greenhouse.

-Inexpensive way to cultivate
Hoop house greenhouses provide an inexpensive way to help greenhouse enthusiasts to get started into cultivating crops.

-Crop protection from predators and extreme weather conditions
Hoop house greenhouses are built to protect plants from different adverse conditions which can be brought about by weather conditions and different crop predators. They provide sturdy and efficient covering for the plants against these factors.

-More varieties of plants can be grown
Because hoop houses will allow longer growing seasons, more varieties of plants can be grown in the hoop houses.

-Increased income and savings
One can cultivate different crops which can be equated into additional income or savings. One can actually sell fruits and vegetables which are grown in the hoop houses or can plant crops which can be consumed by the family, therefore avoiding the need to purchase these from the supermarket.

There are many reasons why gardeners have availed hoop houses for their gardens. Here are some more pertinent facts about hoop houses that should be known by other enthusiasts:

-Most growers recover the cost of building their hoop houses in a single season of planting.

-There are no permits required in building hoop houses since they are not considered as permanent structures.

-The growing seasons can be extended by using hoop houses and several other equipments. Hoop houses usually extend growing seasons by as much as 4 months, but by adding layers of insulating film and an inflation blower, one can extend the growing season more than four months.

-Hoop houses are usually made from galvanized steel. The galvanized hoops serve as the framework for the greenhouse. The material is low maintenance, very sturdy and very economical.

-Hoop houses are characterized by natural regulation of its temperature. There is no need for extra equipments which can be sources of additional costs. The hoop houses are warmed by the natural sun and are cooled by the wind. One can roll the sides up and open the hoop house doors to be able to provide ventilation to the plants inside. This is a very cost effective way of cultivating plants in a greenhouse.

-Hoop houses can be built in places where the winds are prevalent and where snow can be a problem. Hoop houses are built from sturdy frames which are designed to handle heavy winds and can withstand the harsh effects of snowing. One can position the hoop house perpendicular to the winds to maximize the ventilation for the plants. One should also remember to do some maintaining when the snow comes. Occasional brushing of the snow will be very beneficial for the hoop house.

-Hoop houses are quite tall and gardeners can use the vertical space to be able to plant more crops. Adding purlins will allow one to hang baskets, tie up tomatoes and other plants. The baskets can then be used to plant ornamental crops or other types of plants.
-One can customize his hoop house in terms of the creation of doors or windows. The traditional hoop houses have a built-in door and a couple of windows for ventilation.

-There are other functions that hoop houses can do when the planting season is over. They can serve as a chicken coop if one installs poultry netting. They can also be used to grow orchids or other ornamental plants.

-Hoop houses can be relocated easily. Relocating hoop houses can be done without disassembling the structure.

There are many reasons why people turn to hoop houses when they want to have a greenhouse. Aside from the multiple benefits that plants can get from being sheltered by hoop houses, these greenhouses are very economical and won’t dig deep into the gardeners’ pockets.

He may save more money if he decides building a small greenhouse. There are supplies and materials that he can use which should be just enough according to his prepared budget. If there is enough space that can accommodate a larger greenhouse, which is more advisable because he may maximize the place where he wants to develop more plants and vegetables.

If he really desires to build a greenhouse where he can develop and propagate more plants, he may consider different factors that would be necessary on the type of greenhouses he would like to build. Here are some tips and factors he would like to consider in building his own greenhouse.

1.  He may consider using salvage materials if he intends to make a larger greenhouse. He may use these materials in designing and planning for a low cost budget greenhouse. This will also help him minimize the expenses of the other supplies and materials needed.

2.  He should also determine the climate of the place where he lives. An insulated greenhouse should be appropriate for cold climate areas. This will help him provide the needed warmth and heat for his plants. For warm places, a greenhouse that has a shade control should be advisable.

3.  He also needs to make sure that his greenhouse will be designed with proper air circulation spaces, ventilation, pest control soil, heaters for winter season, and humidity control devices. He may create an environment that would be appropriate for the types of plants that will grow in the greenhouse.

4.  The location of the greenhouse should be built were there is enough sunlight. He may choose a solar greenhouse for vegetables and exotic fruit bearing plants if he would like his greenhouse to be situated on the east-west part where his place is more exposed to sunlight.

5.  It is also important to consider the covering of the greenhouse. The most advisable shades are the expensive glass made coverings and fiberglass. They provide more durability and they do not deteriorate quickly compared to plastic coverings. A greenhouse covered with glass or fiberglass allows more humidity and warmth.

6.  He has the option to choose on what kind of foundation he would like to use. The foundations can be concrete for a more secured greenhouse. Others prefer the less expensive lightweight foundation where they use improvised materials such as railroad ties, which they can easily attach to the ground. It all depends on how much he is willing to spend on the structure of the greenhouse.

7.  He may consider building a greenhouse that will maximize its full potential. He may add benches or materials that will be used for his comfort every time he wants to relax in the greenhouse. He may add many accessories to the place like automatic watering systems, heating systems, ventilation system and other automatic equipments that are effective in maintaining the plants.

8.  He may use the “good bugs” for his pest control chemical. They prevent and control the spread of the bad bugs in a greenhouse. If ever he may find insects in a plant, he may isolate the plant and if possible place the plant outside the greenhouse so that the insects would not house the other plants. 

9.  He may allot a space where he can store fertilizers, potting soil and other tools that are essential in the greenhouse. He may place a tool rack nearer to the potting place so that it would be easier for him to transfer the soil from the pot of the plants. He may also place buckets and tool holders to accommodate the other equipment when they are not in use.

He can develop and grow all sorts of plants with a versatile greenhouse. He may also propagate from the grown plants to fill the greenhouse with a variety of plants.  Putting up a greenhouse will be more enjoyable if it done with the help of the family and friends.