©
Redpath Pacific Ltd
P a g e
| 2 06.07.2022
F:\Redpath\Product & Buildings Instr Info\Greenhouse film handling guidelines
The information contained herein is not intended to be all-inclusive and the manner and conditions of use and handling may involve other additional
considerations. Information herein may be modified or updated at any time & may not be reproduced without written permission from Redpath Pacific
Ltd, New Zealand.
U.V Warranty Periods & basic Specifications – Applies from date of delivery to site, when goods are under the customers control
Duratough 215um +0/- 10%, up to 90% nominal light +0/-5%, Diffusion21% +/-10%, non-pigmented natural, 45 month U.V degradation only pro-rata warranty
Polyweave 300um +/- 10%, Up to 80% light +/-10%, , Diffusion 40% +/- 10%. 39 month U.V. degradation only pro-rata warranty
Durashade 215um +/- 10%, 50% dif/- 10% nominal, Pigmented white, 45 month U.V degradation only pro-rata warranty
Duraflex 215um +/-10%, 70% dif/- 10% nominal, Pigmented white, 45 month U.V degradation only pro-rata warranty
INSTALLATION HINTS AND GUIDE. Issued with all greenhouse film sales since March 1
st
1996
To be read in conjunction with Redpath greenhouse film handling guidelines and info on
General:
1)
If possible fit covers on a calm warm day of approx. 15ºC or more, avoid windy conditions.
2)
Closely inspect all frame work to ensure that it is clear of any objects that may cut or damage the film during the installation process. Ensure
that framework meets current greenhouse design standards
3)
Generally a team of 3 persons’ is sufficient. Lay the film with anti-drip facing to inside (if applicable)
4)
Take advantage of early morning calm conditions
Installation Techniques:
Individual greenhouse designs each have their own preferred or simplest film installation technique. Please contact Redpath or our local skinning
contractor for any specific advice you may require. The following information lists some of the common techniques used but this information is not
all-inclusive for all situations. Note: Take usual safety precautions if working off the ground. Be SAFE !
Distribution of Film over Framing:
Note: Film installation treated with Anti-drip should have the writing facing inside & be ‘correct reading’
Option A)
Construct a “goal post” type frame which can be rested against the end wall of structure with the roll of film mounted on the
“crossbar”. The film may then be reeled out over the full length of structure.
Option B)
Unroll the film fully beside the structure and refold lengthways into a long tube. Lift end into gutter and walk the roll the full length
of the gutter (taking care not to snag it) and then pull the film over the structure with anti-drip side (if applicable ) facing down.
Option C)
Place the roll on the ground at the end of the bay to be skinned. Place a pipe through its core and sit it on blocks. Unreel the film
vertically up the end wall and have a person feed the film over the building apex whilst pulling the film along the structure from the
far end using a rope.
Option D)
On rack and pinion ridge vented structures it is usually possible to open the ventilator into a horizontal position and roll the film
along its length and then from there, position film as required.
Helpful Hints:
* In all instances take care not to snag the film on the greenhouse framing when sliding it into position.
* Temporarily install rope/s lengthways on top of rafters or arches to assist with supporting the film between roof trusses.
Tensioning Plastic:
Wide sheet films often requires that a “mechanical tensioning” technique be used by a suitably experienced installer.
1)
Distribute the film as outlined previously,
2)
Clip off one end and also the first 2 metres along each side at the same end, avoiding wrinkles & creasing,
3)
Fasten other end of film to a pulling bar or beam (see fig. 1),
4) Using ratchet straps – attach the pulling bar to an immovable object, (e.g. fence post/tractor),
5)
Apply tension lengthwise to the film by tensioning pulling bar, (adjust angle as required),
6)
Clip off the sides of the film beginning at the films’ centre on each side, and working to the ends, Note: Whilst clipping sides, pull any soft
lengthways wrinkles from film.
7)
Clip off the pulling bar end of film, whilst relieving film tension, then install a batten on every rafter if singleskin.
Note: When using a mechanical tensioning method and to best estimate the greenhouse film finished tension, experience indicates that allowances
need to be made for ambient air temperature and weather conditions, the “stretchability” of the type of film being used, whether it is a single or twin
skin application and the films width that is being installed. If in doubt please contact Redpath.
