Greenhouse structures
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Greenhouse Structures. What does your house provide you with? What are the important features of a home that provide these things? What should a greenhouse provide plants? What features could provide these things?. Student Learning Objectives. 1. Identify greenhouse designs.

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Greenhouse Structures

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Greenhouse Structures


  • What does your house provide you with?

  • What are the important features of a home that provide these things?

  • What should a greenhouse provide plants?

  • What features could provide these things?


Student Learning Objectives

  • 1. Identify greenhouse designs.

  • 2. Identify considerations for greenhouse frameworks.

  • 3. Identify and describe greenhouse glazing materials.


Objectives Cont.

  • 4. Describe the functions of the headhouse.

  • 5. Discuss the advantages of retractable-roof greenhouses.

  • 6. Describe greenhouse bench options.


Terms

  • Acrylic structured sheets

  • Bench

  • Even-span greenhouse

  • Fiberglass

  • Glass

  • Glazing

  • Greenhouse


Terms

  • Greenhouse framework

  • Headhouse

  • Hoop-house

  • Lean-to greenhouse

  • Polycarbonate structured sheets

  • Polyethylene

  • Retractable-roof greenhouse


Terms

  • Ridge-and-furrow greenhouse

  • Rolling bench

  • Structured sheets

  • Uneven-span greenhouse


What are the common greenhouse types?

  • A greenhouseis a structure enclosed by glass or plastic that allows light transmission for the growth of plants. There are four basic styles of greenhouse design.

    • The lean-to greenhouseshares a wall with a building and relies on the building structure to provide support for the roof.


Lean-to Greenhouse

Courtesy, Interstate Publishers, Inc.


  • Even-span greenhousestructures are single houses that have roofs with an even pitch and an even width. A common even-span greenhouse that uses arching pipes for the framework is called a hoop house.


Even Span Greenhouse

Hoop house


  • Uneven-span greenhouseshave unequal pitches and widths. Use of this style is limited to hillsides.

  • Ridge-and-furrowgreenhouse structures consist of a number of greenhouses connected along the length of the house.


Uneven Span Greenhouse

Ridge and Furrow Greenhouse


Create a Greenhouse

  • Use the marshmallows and toothpicks to create a greenhouse of one of the styles we have just discussed.


What considerations need to be addressed for greenhouse frameworks?

  • The greenhouse frameworksupports the greenhouse covering material.

    • The framework should be strong, yet allow the maximum amount of light to reach the plants.


  • Aluminum and aluminum/steel

    • long lasting, low maintenance

  • Wood

    • Not used much anymore

  • Angle iron

    • Ornate but heavy

  • Plastics

    • Cheap but light and easily broken


What materials are used for greenhouse glazing?

  • The covering of the greenhouse is referred to as the glazing.

    • Considerations include:

      • Durability

      • Light transmission

      • Cost

      • Heating costs

Start Here


  • Flexible sheets of polyethyleneare stretched over the greenhouse framework.

  • Structured sheets, including polycarbonate, acrylic, and fiberglass, which are made with double walls offer good insulation.


  • Polyethylene

    • Good insulator

    • Cheap

    • Flexible

    • Lasts 5-7 years


  • Polycarbonate structured sheets

    • Most widely used

    • Good light transmission

    • Resist hail damage

    • Easy to work with.


  • Polycarbonate sheets

  • Box shaped tubes


  • Acrylic structured sheets

    • High light transmission

    • Cost more than polycarbonate sheets

    • Prone to hail damage

    • Less flexible than polycarbonate


  • Solid plastic sheets


  • Fiberglass

    • Dropped in popularity

    • Discolors after 7-10 years

    • Flammable

    • Poor insulator


  • Glass

    • Best material for crop production

    • Highest light transmission

    • Long lasting

    • Expensive

    • Breakable


Headhouse

Supports the production of greenhouse crops

Attached to greenhouse

Storage area

Potting area

Office

Shipping area

What are the functions of the headhouse?


What are the advantages of retractable-roof greenhouses?

  • Retractable-roof greenhouse

    • Allow the roof to be opened and closed.


  • Open the roof when weather conditions are favorable

  • Close the roof when crops need protection


  • Provide plants with increased light levels and fresh air

  • Prepare outdoor crops for elements before leaving the greenhouse

  • Reduced disease problems

    • Better ventilation

  • Reduced irrigation

    • Rainfall

  • More effective temperature control for DIF.


Bench

Structure that holds the plants above the ground.

Arranged with aisle space and growing space in mind

Made of

expanded galvanized steel

Aluminum

Plastic

Rot resistant wood

What are greenhouse bench options?


  • Rolling benches maximize growing space by limiting space for aisles. The benches are placed on pipes, which allows them to be easily moved from side to side.


  • Benchlayouts

    • conventional

    • Peninsular

    • Movable benches


Review/Summary

  • What are the common greenhouse sizes?

  • What considerations need to be addressed for greenhouse frameworks?

  • What materials are used for greenhouse glazing?


Review/Summary cont.

  • What are the functions of the headhouse?

  • What are the advantages of retractable-roof greenhouses?

  • What are greenhouse bench options?


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