Stuppy Greenhouse Blog

Recommended Practices Concerning Film Greenhouse Covering

Posted by admin on Feb 10, 2015 2:56:29 PM
  1. Except for greenhouse covering expressly known to be manufactured for greenhouse use, no polyethylene or other film should be used as glazing, for covering any greenhouse or for any similar purpose.
  2. Single layers of film may not be sufficiently resistant to wind stress of impact. Therefore, it is recommended that two layers, air inflated to .2-.3 inches of water pressure measured on a manometer be used. Outside air should be used for inflation because of its lower cold weather moisture content. Inflation air should not be directed perpendicularly or nearly perpendicularly at the film but obliquely to it.
  3. Paint should not be applied to film. It is recommended for shading purposed appropriate compounds made expressly for shading of greenhouse film be used. If rafters are painted, paint should be fully cured before putting film in contact with rafters. In this regard, the use of latex paint rather than solvent-based paint is recommended. Painting the film above wood or metal supports, with a white compound will reduce the film temperature and help to maintain film life.
  4. Soap or detergent should not be left on film. If film is washed with soap or detergent, it is recommended that immediately thereafter the film be will but carefully rinsed with water. Do not use soap containing “pine oil” or other solvents.
  5. a) Wood treated with volatile preservatives (i.e. pentachlorophenol and creosote) should not come into contact with film. Pressure preservative-treated wood is safe for use. b) Colorless film should not be used on greenhouses framed with PVC. Using colorless films on PVC structure will significantly shorten the film life.
  6. Film should not be secured by puncturing it with nails or otherwise. In this regard, it is recommended that aluminum locking channels be used. If film must be installed by nailing, the film should be wrapped around a piece of lath or sandwiched between two pieces of lath.
  7. If pesticides and other chemicals are used inside the greenhouse, the following recommendations are presented to help to limit their contact with the film(s) and, therefore, their effect on the film:
  • Use outside air to inflate between the layers of film in a double layer house.
  • If inside air is used:
  1. Place the air inlet to the blower in the upper portion of the house. This will help prevent pesticide-laden air from being drawn into the blower.
  2. Baffle the outlet of the blower to prevent air with high concentrations of pesticides from being blown directly at on small area of the film. The baffle should also help to remove droplets of pesticide from the air stream.
  • Turn off the inflation blower when pesticides are being applied. Allow the pesticides to settle before restarting the blower.
  • When possible, use topical applications of pesticides on the crop, rather than fogging, to reduce the potential for pesticide contact with the film.
  • If a pesticide solution is sprayed on the film, wash the area with water, as soon as possible, to remove any pesticide residue.

Topics: greenhouse covering, maintaining greenhouse plastic, maintaining greenhouse, inflating greenhouse poly, poly greenhouse, replacing greenhouse plastic, treating greenhouse plastic, greenhouse inflation, double poly installation, greenhouse maintenance, double poly, replacing poly, plastic greenhouse

Subscribe to Email Updates

Recent Posts

Posts by Topic

see all

Follow Me