Types Construction to include Framework and coverings Greenhouses Types Construction to include Framework and coverings

Greenhouses- Structure for growing plants – - Covered with transparent material - Is artificially heated - Is tall enough for people to walk in.

Even Span detached greenhouse Most common style for single houses.

Even Span detached greenhouse Several houses may be attached together to form one large structure

Even Span houses Even Span greenhouses have clear spans with truss supports, rather than supporting columns.

1. Lean-to Built against other greenhouses or buildings. Are small structures. Often used for bulb forcing or seed starting.

2. Quonset greenhouses Made with curved roof bars. Inexpensive Covered with sheet film plastic or fiberglass panels.

3. Gothic Arch Greenhouses Not widely used Made from laminated wooden trusses. Greater span is achieved than with standard wood trusses. Used for spring flowering annuals.

4. Curvilinear and Curved Eave. Very Expensive Used in parks and botanical gardens.

5. Lath Houses Made from wood or wood with a metal frame. Used to provide shade to plants.

Advantages of Detached Greenhouses Easier to program and maintain temperature. Easier to ventilate Light enters a detached greenhouse more uniformly. Easier to care for and maintain than connected houses.

Disadvantages of Single Unit Greenhouses Large Single unit greenhouses have high initial cost. Requires more land area. Greater loss of heat, do to increases height of a single unit greenhouse.

Advantages of Connected Greenhouses Require less land area than detached greenhouses. Fewer construction materials required. Less heat required.

Disadvantages of Connected Greenhouses Snow cannot be easily removed. There is a smaller volume of air above crops in connected greenhouses. Same amount of Roof area required.