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Greenhouse Structural Components Greenhouse Management.

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Presentation on theme: "Greenhouse Structural Components Greenhouse Management."— Presentation transcript:

1 Greenhouse Structural Components Greenhouse Management

2 Structural Components Greenhouses are made by assembling different parts or components. Greenhouses are made by assembling different parts or components. Each part has a specific role in the overall greenhouse structure. Each part has a specific role in the overall greenhouse structure.

3 This slide shows the basic components of a greenhouse

4 Side Posts Support the trusses and bear the weight of the greenhouse. Support the trusses and bear the weight of the greenhouse. Set in concrete footings. Set in concrete footings. Typically spaced 10 feet apart. Typically spaced 10 feet apart.

5 Curtain Wall The first several feet of sidewall above the soil line. The first several feet of sidewall above the soil line. Usually made of some solid building material such as poured concrete, concrete blocks, bricks, or treated lumber. Usually made of some solid building material such as poured concrete, concrete blocks, bricks, or treated lumber.

6 Sill The top of the curtain wall The top of the curtain wall

7 Eave Where the sides of the greenhouse join the roof of the greenhouse. Where the sides of the greenhouse join the roof of the greenhouse. The “top” of the sides of the greenhouse. The “top” of the sides of the greenhouse.

8 Truss Structural component that supports the weight of the greenhouse roof. Structural component that supports the weight of the greenhouse roof. Consists of rafters, struts, and chords. Consists of rafters, struts, and chords.

9 Purlin Purlins run the length of the greenhouse. Purlins run the length of the greenhouse. Keep the roof trusses aligned. Keep the roof trusses aligned.

10 Ridge Where the roofs come together at the top of the greenhouse. Where the roofs come together at the top of the greenhouse. Many greenhouses have a ridge vent(s). Many greenhouses have a ridge vent(s).

11 Sash Bars Run perpendicular to the purlins. Run perpendicular to the purlins. Attached to the purlins. Attached to the purlins. Hold the glazing in place. Hold the glazing in place. Sometimes built with a drip groove or channel to catch condensation that forms on the inside of the glass panels. Sometimes built with a drip groove or channel to catch condensation that forms on the inside of the glass panels. purlin sash bars

12 Wooden Sash Bar Close-up Sash bar Glass panels Drip groove Sash bar cap

13 Aluminum Sash Bar Close-up

14 Sash Bar Cap Fastened to the sash bars with screws. Fastened to the sash bars with screws. Functions to hold the glass panels in place. Functions to hold the glass panels in place. Bar cap

15 Siting a Greenhouse Topography Topography Select as level a site as possible. Select as level a site as possible. Amount of land Amount of land The general “rule of thumb” is to purchase at least twice as much land as the desired growing area. The general “rule of thumb” is to purchase at least twice as much land as the desired growing area. For example, you desire to build a ridge & furrow greenhouse measuring 50 feet x 150 feet. For example, you desire to build a ridge & furrow greenhouse measuring 50 feet x 150 feet. 7,500 square feet x 2 = 15,000 square feet =.34 acres 7,500 square feet x 2 = 15,000 square feet =.34 acres

16 Greenhouse Orientation Depends on latitude and whether the greenhouse is connected or detached. Depends on latitude and whether the greenhouse is connected or detached. Single, detached greenhouse: Single, detached greenhouse: In northern latitudes an east-west orientation is favored because light can enter through the sides rather than through the ends of the greenhouse where it would cast more shade. Also, because our winds are predominately from the west (blue arrow) this positions an end wall of the greenhouse into the wind. W E S N

17 Greenhouse Orientation Connected Greenhouses: Connected Greenhouses: An east – west orientation is not ideal. North South

18 Greenhouse Orientation Connected Greenhouses: Connected Greenhouses: A north – south orientation is BEST! North South

19 Windbreaks Planted on the north and west sides of the greenhouse. Planted on the north and west sides of the greenhouse. Help reduce heat loss from the greenhouse. Help reduce heat loss from the greenhouse. Greenhouses should be located a minimum of 100 feet away. Greenhouses should be located a minimum of 100 feet away.

20 Framing Materials Two basic kinds of material: Two basic kinds of material: Wood Wood Metal; primarily aluminum or aluminum alloys Metal; primarily aluminum or aluminum alloys

21 Wood Redwood, cedar, or some other rot-resistant wood. Redwood, cedar, or some other rot-resistant wood. Treated wood. Treated wood. Beware of mercury-based paints and preservatives because fumes from these products are toxic to plants. Beware of mercury-based paints and preservatives because fumes from these products are toxic to plants.

22 Aluminum Lightweight Lightweight Strong Strong Rust resistant Rust resistant Framing materials can be manufactured thinner and be spaced further apart allowing for minimal shading. Framing materials can be manufactured thinner and be spaced further apart allowing for minimal shading.

23 Stresses on the Greenhouse Weight of the framing and glazing. Weight of the framing and glazing. Snow loads. Snow loads. Wind pressure. Wind pressure. Temperature; fluctuating temperatures cause expansion and contraction of framing and glazing materials. Temperature; fluctuating temperatures cause expansion and contraction of framing and glazing materials.

24 Headhouse Service building with overhead doors. Service building with overhead doors. Used for planting, media preparation and storage, chemical storage, container storage and office space, etc. Used for planting, media preparation and storage, chemical storage, container storage and office space, etc. Head House

25 Headhouse, continued… May also include the heating plant (boiler) and a cold storage facility. May also include the heating plant (boiler) and a cold storage facility. Should be at least 10% of the total growing area of the greenhouse. Should be at least 10% of the total growing area of the greenhouse.

26 The End


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