HELPFUL TIPS ABOUT GREENHOUSE FILMS


Fold Methods Installation Hints


• When installing, make certain the film is placed on top of the greenhouse according to the folds.


Double-Wound Sheet GT: Gusseted Tube


• The film should be installed during the early morning hours (cooler without wind). • Do not stretch the film on hot days as it will contract when cool and may weaken. • Static air pressure between the two layers should be between 0.2 and 0.4 inches of water on a manometer.


• Use outside air to inflate as it's less humid and less likely to contain chemicals.


• Avoid direct spraying of chemicals on film surfaces.


• Paint all metal and wood surfaces touching the poly with white latex paint. Never use oil-base paint. Do not use chemically treated lumber.


Double Fold LF: Layflat


• Avoid contact with PVC and vinyl. • Smooth the surface of metal and wood parts. • Use only repair tape recommended for poly.


Manometer TDF: Tubing Double Folded


CSTF: Center-Slit Tubing Folded


A manometer is a simple device for measuring air pressure between two layers of poly. You can make one out of a piece of wood, 1/4" clear plastic tubing, and a ruler. The key rule of thumb is to inflate the poly to 1/4" of water. This means that in the “U” shaped plastic tube with water in it, the water on the side toward the poly is 1/4" lower than the side away from the poly. At this level, the poly will be approximately 12" to 16" apart at the center on wide greenhouses and 4" to 6" on more narrow ones.


1/4" ID Plastic Tube Clamp


GS: Center-Slit Gusseted


WF: W-Fold Sheet or M-Sheet


1/4" Water Difference


Plywood with 1/4" Lines


Probe


Poly Accessories BFG also offers a variety of poly accessories.


FT: Layflat Tubing CF: Centerfold


• UFGS: U Fold Center Slit Gusseted Sheet • UFT: U Fold Tube


See page 36 for more information.


28


Prices and availability may vary by location. Prices are subject to change without notice. Minimum quantities may apply


Prices and availability may vary by location. Prices are subject to change without notice. Minimum quantities may apply.


COVERINGS


BFG Supply Co. (800) 883-0234 | Toll Free Fax: (800) 645-6126 | www.bfgsupply.com


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