Let Us Clear Up a Few Concerns Regarding 'Protecting Your Greenhouse In Strong Winds'- Referring to the three methods of retaining polycarbonate sheeting into a Greenhouse frame
The first and least efficient in our specialist opinion is the use of wire spring clips which hold the panels in place by applying pressure against the panel. Holding the polycarbonate panels in place with clips will leave your greenhouse most vulnerable in high winds.
Another method similar to this is the use of PVC bar capping where strips of PVC are clipped into place against the panel to hold it against the greenhouse frame. Once again the main problem with this is that you are relying on a secondary component to support the panel which can often fail especially in windy conditions. You also have the concern that PVC no matter its quality will inherently fade and breakdown in the harsh Australian environment. This design is utilised by manufacturers to cut down on production runs for different frame profiles when producing different thickness polycarbonate panels or glazing. Essentially you are purchasing a generic design that is effectively not designed specifically to encapsulate individual panel thicknesses.
The following quoted paragraph was written & published by John Borthwick back in May 2008. He has had many years of experience in the Greenhouse Industry and is from the UK - Greenhouse capital of the world!
“Of course, some models are stronger in the wind, but they are ALL vulnerable to wind damage - EVEN THE VERY STRONGEST MODELS AVAILABLE IN BRITAIN. So we recommend that you take the potential threat of the wind to damage your greenhouse very seriously not just when choosing your greenhouse, but also positioning it, maintaining it and checking it on an ongoing basis (Aussie Greenhouses will provide you with a special '10 Tips for Greenhouse Growing' as a bonus which will cover some helpful steps to prevent wind damage). Go for the strongest greenhouse you can afford: as a general rule, the more you spend (on the basic frame- not your total bill), the stronger the frame will be. Consider bar capping to replace clips if it is available.
If your glass(polycarbonate) is held in with clips, your greenhouse is most vulnerable to panes of glass(panels) blowing out in high winds. To help prevent this, we recommend using silicone sealant to secure the clips. Or alternatively you can replace the clips with Bar capping, a full length PVC capping system that secures the glass(polycarbonate) all the way up and holds it far more firmly in windy conditions."- End
Let's be clear that polycarbonate panelling is merely the cladding material for your Greenhouse to provide insulation properties. More important factors to consider are the strength and design of the frame. A simple industry comparison is that of the commercial aluminium window and glazing industry. Do they use secondary components that are wedge in to hold their glass in place? Certainly not, the pane of glass sits into the aluminium frame and channel to hold it firmly in place.
Reality is that the method of using PVC bar-capping is not innovative or new; it’s been around for years (the article written above was from 2008). It was designed to hold ‘glass’ panels in place and to make it easier when it came to manufacturing Glass Houses as the same bar-capping could be used for either 4mm, 6mm or 8mm thickness of glass. It was also introduced to eradicate the use of using ‘clips’ to hold the panels in place which did help with wind resistance and was a better method at the time.
However in our opinion, Greenhouse design has come a long way since and has been superseded with the slotted channel method. Hence why so many other Greenhouse Companies choose this method and perhaps why bar-capping has never been introduced to the Australian market...
The Slotted Channel method is where the polycarbonate panels slide into the aluminium channel and is secured on both faces of the panel by a single aluminium sectional profile. This means there is no reliance on a secondary component that is wedged to hold the sheet in place. We stand by the fact that the best construction method for a solid Greenhouse structure is the slotted channel method as ultimately this will provide longevity and improve wind resistance.
Think long and hard before spending a lot of extra dollars on a Greenhouse design that is essentially outdated and by no means anymore ‘wind proof’ than any other on today’s market. The best advice we can give you is to take your time, prepare a solid foundation and check your Greenhouse regularly. If you have any concerns what’s so ever remember we are always here to help you anyway we can. To find out more about our Greenhouse range view About Us Page
This guide has been written to purely point out the different methods of 'Greenhouse design' and is in no way meant to offend other sellers or their products. At the end of the day 'you' the buyer will ultimately make a decision based on what is right for you. We hope this has cleared a few things up and we look forward to providing you with top quality Greenhouses and accessories in the future!
Rest assured when buying from Aussie Greenhouses you are purchasing Greenhouses that have been researched and cleverly designed to use the most up-to-date methods available on today's market! We are very proud to own and use these products ourselves :-)
To view the largest Range of Greenhouses & Accessories on eBay visit Aussie Greenhouses Store
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