Greenhouse StructuresGreenhouse Structures

What does your house provide you with?What does your house provide you with?

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

What should a greenhouse provide What should a greenhouse provide plants?plants?

What features could provide these What features could provide these things?things?

Student Learning ObjectivesStudent Learning Objectives

1. Identify greenhouse designs.1. Identify greenhouse designs.

2. Identify considerations for greenhouse 2. Identify considerations for greenhouse frameworks.frameworks.

3. Identify and describe greenhouse 3. Identify and describe greenhouse glazing materials.glazing materials.

Objectives Cont.Objectives Cont.

4. Describe the functions of the 4. Describe the functions of the headhouse.headhouse.

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

6. Describe greenhouse bench options.6. Describe greenhouse bench options.

TermsTerms

Acrylic structured sheetsAcrylic structured sheets BenchBench Even-span greenhouseEven-span greenhouse FiberglassFiberglass GlassGlass GlazingGlazing GreenhouseGreenhouse

TermsTerms

Greenhouse frameworkGreenhouse framework HeadhouseHeadhouse Hoop-houseHoop-house Lean-to greenhouseLean-to greenhouse Polycarbonate structured sheetsPolycarbonate structured sheets PolyethylenePolyethylene Retractable-roof greenhouseRetractable-roof greenhouse

TermsTerms

Ridge-and-furrow greenhouseRidge-and-furrow greenhouse Rolling benchRolling bench Structured sheetsStructured sheets Uneven-span greenhouseUneven-span greenhouse

What are the common What are the common greenhouse types?greenhouse types?

A A greenhousegreenhouse is a structure enclosed by is a structure enclosed by glass or plastic that allows light glass or plastic that allows light transmission for the growth of plants. There transmission for the growth of plants. There are four basic styles of greenhouse design.are four basic styles of greenhouse design. The The lean-to greenhouselean-to greenhouse shares a wall shares a wall

with a building and relies on the building with a building and relies on the building structure to provide support for the roof.structure to provide support for the roof.

Courtesy, Interstate Publishers, Inc.

Lean-to Greenhouse

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

Even Span Even Span GreenhouseGreenhouse

Hoop houseHoop house

Uneven-span greenhousesUneven-span greenhouses have have unequal pitches and widths. Use of this unequal pitches and widths. Use of this style is limited to hillsides. style is limited to hillsides.

Ridge-and-furrowRidge-and-furrow greenhousegreenhouse structures consist of a number of structures consist of a number of greenhouses connected along the greenhouses connected along the length of the house. length of the house.

Uneven Span Uneven Span GreenhouseGreenhouse

Ridge and Furrow Ridge and Furrow GreenhouseGreenhouse

Create a GreenhouseCreate a Greenhouse

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

What considerations need to be What considerations need to be addressed for greenhouse addressed for greenhouse frameworks?frameworks? The The greenhouse frameworkgreenhouse framework supports supports

the greenhouse covering material.the greenhouse covering material.

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

Aluminum and aluminum/steelAluminum and aluminum/steel long lasting, low maintenancelong lasting, low maintenance

WoodWood Not used much anymoreNot used much anymore

Angle ironAngle iron Ornate but heavyOrnate but heavy

PlasticsPlastics Cheap but light and easily brokenCheap but light and easily broken

What materials are used for What materials are used for greenhouse glazing?greenhouse glazing?

The covering of the greenhouse is The covering of the greenhouse is referred to as the referred to as the glazingglazing.. Considerations include:Considerations include:

DurabilityDurability Light transmissionLight transmission CostCost Heating costsHeating costs

Flexible sheets of Flexible sheets of polyethylenepolyethylene are are stretched over the greenhouse stretched over the greenhouse framework. framework.

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

PolyethylenePolyethylene Good Good

insulatorinsulator CheapCheap FlexibleFlexible Lasts 5-7 Lasts 5-7

yearsyears

Polycarbonate structured sheetsPolycarbonate structured sheets Most widely usedMost widely used Good light transmissionGood light transmission Resist hail damageResist hail damage Easy to work with.Easy to work with.

Polycarbonate Polycarbonate sheetssheets

Box shaped Box shaped tubestubes

Acrylic structured sheetsAcrylic structured sheets High light transmissionHigh light transmission Cost more than polycarbonate sheetsCost more than polycarbonate sheets Prone to hail damageProne to hail damage Less flexible than polycarbonateLess flexible than polycarbonate

Solid plastic Solid plastic sheetssheets

FiberglassFiberglass Dropped in popularityDropped in popularity Discolors after 7-10 Discolors after 7-10

yearsyears FlammableFlammable Poor insulatorPoor insulator

GlassGlass Best material for crop productionBest material for crop production Highest light transmissionHighest light transmission Long lastingLong lasting ExpensiveExpensive BreakableBreakable

What are the functions of the What are the functions of the headhouse?headhouse?

HeadhouseHeadhouse Supports the Supports the

production of production of greenhouse greenhouse cropscrops

Attached to Attached to greenhousegreenhouse

Storage areaStorage area Potting areaPotting area OfficeOffice Shipping areaShipping area

What are the advantages of What are the advantages of retractable-roof greenhouses?retractable-roof greenhouses?

Retractable-roof greenhouseRetractable-roof greenhouse Allow the roof to be opened and Allow the roof to be opened and

closed.closed.

Open the roof when weather conditions Open the roof when weather conditions are favorableare favorable

Close the roof when crops need Close the roof when crops need protectionprotection

Provide plants with increased light levels Provide plants with increased light levels and fresh airand fresh air

Prepare outdoor crops for elements before Prepare outdoor crops for elements before leaving the greenhouseleaving the greenhouse

Reduced disease problemsReduced disease problems Better ventilationBetter ventilation

Reduced irrigationReduced irrigation RainfallRainfall

More effective temperature control for DIF.More effective temperature control for DIF.

What are greenhouse bench What are greenhouse bench options?options?

BenchBench Structure that holds Structure that holds

the plants above the the plants above the ground.ground.

Arranged with Arranged with aisle space and aisle space and growing space in growing space in mindmind

Made ofMade of expanded expanded

galvanized steelgalvanized steel AluminumAluminum PlasticPlastic Rot resistant woodRot resistant wood

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

BenchBench layoutslayouts conventional conventional PeninsularPeninsular Movable benchesMovable benches

Review/SummaryReview/Summary

What are the common greenhouse sizes?What are the common greenhouse sizes?

What considerations need to be What considerations need to be addressed for greenhouse frameworks?addressed for greenhouse frameworks?

What materials are used for greenhouse What materials are used for greenhouse glazing?glazing?

Review/Summary cont.Review/Summary cont.

What are the functions of the What are the functions of the headhouse?headhouse?

What are the advantages of retractable-What are the advantages of retractable-roof greenhouses?roof greenhouses?

What are greenhouse bench options?What are greenhouse bench options?