1. V.GREENHOUSE STRUCTURES A.Introduction B.Selection - factors 1. strength & design

2. 2. light transmission a.intensity inside greenhouse b.factors determining intensity 3. working conditions 4. initial cost

5. 5.maintenance costs 6.flexibility and adaptability 7.insurance and taxes 8.environmental control

6. D. Structure components

7. C.Peaked roof design a. roof slope 26-28° on glass x fiberglass structures –(6" vertical : 12" horizontal)

8. Light passing through glass at different sun angles Date26 0 slope Angle of sun Dec 2137 Nov&Jan33 Sep&Mar24 Aug&Apr1 Jul&May7 June 2110

9. Ridge height of house Greenhouse width (ft) 26 0 slope ft-in 1811’ 9” 2112’ 5” 2513’ 5” 2814’ 2” 3215’ 2” 3515’ 10” 4217’ 6” 4919’ 4”

10. D.Structural types 1. post rafter A-frame post-truss3. 4.rigid-frame 5.quonset 6.gothic 7.ridge and furrow 8.connecting pipe house

12. Designed by Dr. John walker, Agriculture Engineer. University of Kentucky

16. E.Structural materials 1. Wood –types Cypress, black locust, red ceder redwood, osage orange –characteristics high maintenance light weight available

17. 2. Treated wood nontoxic chemicals –Chemonite (NH 4 CuAsO 4 ) –Greensalts (CrCuAsO 4 ) –Osmose K-33 (CrCuAsO 4 ) toxic chemicals –Pentachloro phenol –Creosote treatment method –Pressure not painting –Last 20-30 yrs

18. 3.Steel treatment –Galvanized –Painted characteristics –Longevity –Heavy –Rust

19. 4.Aluminum characteristics –little corrosion, low maintenance –light weight –strong –light reflectance –attractive –high cost

23. Ridge height of house Greenhouse width (ft) 26 0 ft-in63 0 ft-in 1811-925-0 2112-527-11 2513-531-10 2814-234-10 3215-238-9 3515-1041-9 4217-648-6 4919-455-5