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Redpath Pacific Ltd
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| 1 06.07.2022
F:\Redpath\Product & Buildings Instr Info\Greenhouse film handling guidelines
Please read the following prior to film installation page to maintain expected film life. The following highlighted * guidelines are a condition
of the pro-rata U.V. warranty. Please check with your independent consultant for ideal film/crop compatibility or your installer for structural
compatibility. Warranty applies from date goods arrive on the customer’s site.
General
1. Many greenhouse films contain slip and Anti condesate additives and to aid the installation process & user use. These additives give the film a slight haze at
differing levels across the sheet. Over time these additives tend to deplete with general weathering. Fold lines and additives in the MD direction will be present and
are a result of the manufacture processes. Note: Wash hands after handling film and before eating or preparing food.
*2. Avoid dragging the roll when transporting, or on site, avoid rubbing film against abrasive objects whilst handling or unrolling.
*3. Do not leave film unwrapped / uncovered and exposed to sunlight for hour(s) at a time in roll form it can heatsink the roll.
*4. If film is not being used immediately store it in its original packing in a cool, dry, dark area. Do not store rolls on their ends. Store away from any
chemicals/solvents. The film will slowly degrade whilst in storage, film warranty begins at the date the goods are invoiced.
*5. Inspect all framework prior to installation to ensure that structure is clear of abrasive surfaces that may damage the film during installation or when in place. Use
"Polyguard" hot spot protection tape where necessary.
*6. If tanalised/treated timber is in contact with, or in the close vicinity of, the greenhouse film i.e. framing, battens tops of posts etc. ensure that it is painted with 2
coats of water based white paint, DO NOT USE OIL BASED OR P.V.C. PAINTS, wood preservatives in particular copper based products can contain petroleum and
other distillates which when in close proximity may shorten the films life.
*7. Products manufactured from or using P.V.C. in their makeup should not be used in the close vicinity or within contact of greenhouse films.
*8. Frame lagging tape i.e. "Polyguard" white self adhesive felt, should be used at any film/frame contact point to reduce abrasion and reflect excessive heat,
especially on metal / alloy / timber frames. Ensure oily residue is cleaned off any new metal framework.
*9. Avoid using a film holding system that punctures the film during installation, i.e. nails, battens, staples and tapes. If acrylic painted battens are used to hold down
covers, an isolating highshear batten tape should be used to prevent tearing. (See Duralock or Lockstrip film clipping systems)
*10. For best results avoid fitting film in windy or cold (below 15degC conditions) as it may be difficult to gain correct tension. The film should be tensioned in a
manner that maintains even tension If film is fitted in poor weather conditions, or on a building with insufficient pitch (less than 22degrees of angle) to avoid ponding
or excessive film movement in wind the film may require re-tensioning at a later date due to the fold lines and film ‘relaxation’.
*11. For Twinskin applications always install a manometer air pressure-monitoring gauge and exhaust vent prior to initially inflating,. Twinskin covers should only
have the "slack" removed from them during installation with air pressure inflation providing actual tensioning. (Note; always draw inflation air from outside). Air
pressure should be monitored monthly & allowances made for site-specific weather conditions.
*12. We recommend that an experienced greenhouse contractor install this film (especially roof covers) to ensure correctness of tension and long term overall
performance. Installing greenhouse films at different times of the year will affect their performance & finish. Installing new film to only part of the greenhouse may
introduce differing temperature & humidity zones to the greenhouse environment (as the new greenhouse film may have differing energy, light & transparency /
diffusion values)
*13. If painting the exterior surface of this film for shading purposes, use specified greenhouse shade paints only.
*14. In warmer climates "striping" with a white water based paint or applying a white reflective tape to the top surface of the film at the edges may assist in the
reduction of excessive heat build-up at these points and extend film life. Ensure there is an adequate Ventilation System to limit extreme heat build up inside the
greenhouse, including when the greenhouse is left fallow.
*15. Inspect your greenhouse film monthly & maintain & repair any tears or holes promptly that may appear over time.
*16. Avoid direct contact of pesticides / chemicals with the film when spraying, Direct contact will shorten the life of greenhouse film if allowed to build up to
concentrated levels. PLEASE NOTE: Foggers units will increase chemical contact with film, and sprays such as Banrot, Bromide gas, Bromoxynil, Chloropicrin,
Chlorine gas, Chlorpyrifos, Chlormaquat chloride, Chlorothalonil, Chloride, Chlorine bleach, Copper sulfate, Captan, Dithiocarbamates, Dienochlor, Diazinon,
Fluvalinate, Formetanate Hydrochloride, Hypochlorite swimming pool chemicals, Iprodine, Iron, Methyl bromide, Methomyl, Mancozeb, Metam sodium, Oxamyl,
Pentachchloronitrobenzene (PNCB), Permethrin and other synthetic pyrethroids, Pool chemicals, Sulfur, Silver thiosulfate, Vinclozolin, or containing chlorine,
bromide, fluorine, copper, petroleum, oil should be used with care.
*18. Clean your greenhouse film annually (inside and outside) using a suitable agent (no chlorinated or petroleum based cleansers) Take special care to wash the
condensation collection points i.e. purlins, top wall rails and base rails as these often harbour dirt and chemical build-up. Special care should also be taken if the
greenhouse is located near high outside spray use areas, i.e. Orchards etc, or if exposed to naturally occurring chemicals e.g. sulphur etc.
*19. Your greenhouse design should conform to modern day accepted standards roof pitch, frame support/span, compatible materials etc, isolation battens, affect
film life. If in doubt about the suitability of your greenhouse structure for this film please contact your film supplier prior to installation.
*20. The anti-condensation agent used in most of these films, will in time “wash out”. The film may then be treated with a product such as “Sunclear” to return the
anticondensate performance to the film. The anticondensate “washing out” period will vary & is dependant on the greenhouses ventilation performance, local
environmental conditions, growing techniques / practices, type of crop etc. The anti-condensate additive may add a small amount of diffusion to the film.
Note: Film installation treated with Anti-drip should have the printed –on film name/code writing facing inside – and this should be correct reading left-
to-right when looking up from the inside.
*21. Warranties/claims will not necessarily be honoured if goods are unpaid for.
PRO-RATA WARRANTY CLAIMS, also refer
for current warranty information
Duratough, Durashade, Duraflex, and Polyweave greenhouse films are supplied by Redpath in New Zealand with a Pro-rata Ultra Violet Warranty Only (see time allowances below).
A pro-rata warranty is calculated by deducting the used life of the film from the replacement cost of the film. The risk in the Greenhouse, goods and purchases shall, unless otherwise
agreed in writing, pass to the buyer upon invoice. Without limiting the generality of this Clause, the buyer assumes all risks and liabilities for any consequential losses arising from the
use of any or all of the Greenhouse and goods whether singly or in combination with other products. Any warranty claims against these products should be directed in writing to your
original supplier or Redpath Pacific Ltd, PO Box 9058, Palmerston North, with details of purchase date, code number on film, information on your greenhouse design, type of crop &
list of sprays used film installation technique, And also the list of maintenance records that have been in place and also the nature of the damage supported with pictures. This
information can also be e-mailed to [email protected]
GREENHOUSE FILM HANDLING GUIDELINES & WARRANTY CONDITIONS
06.07.2022
PACKED WITH ALL DURATOUGH, DURASHADE, DURAFLEX & POLYWEAVE GREENHOUSE FILM SALES
