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Keeping a glass stock important for the continuity of your business

The times that glass could be delivered on short notice are over. The variety in sizes and types off glass have increased tremendously. Therefore the size of glass you select when building your greenhouse is important, as well as maintaining a small stock of glass in case a few sheets crack or break.

Storm, high winds, hail. Three weather elements that have been in the news way to often over the last couple of years. Not only leading to broken glass but also threatening the precious crop underneath. A good stock of repair glass can make the difference between an annoying event or a disaster. However, it is hard to determine the proper amount of sheets you need to keep in stock. In case of a disaster any stock will be insufficient to repair the damage.

In the past new glass could be delivered in a couple of days, or cut into the right size, on site. With the use of heat straightened glass (hardened glass) or diffuse glass the time to deliver increased up to a number of weeks. Keeping a slightly larger stock of glass sheets now makes sense.

Besides the special glass and safety regulations, the dependency on qualified workers to execute the repair, due to the size of the sheets, has increased. Nowadays qualified workers are rare to find.

Qualified workers are easier to attract when they are able to start repairs immediately and continue repairing for at least a couple of days.

We advise to keep the following glass and repair stock: 

Surface greenhouse

Glass stock

Distribution in size

Repair sets

≤ 30.000m²

100 sheets
(different sizes)

35  sheets
cutting glass *

60% main sheet      

10% vents sheet

10% under vents

10% small sheet (high air pressure area gable end)

10% gable glass


1 set per 2000 m²

·     min of 5 sets

·     max of 30 sets

extra for each 10.000m2

25 sheets


500 sheets

 * cutting glass in the biggest size of gable or roof.

In some situations where multiple roof systems are present this can lead to very large amounts of glass in stock. In concentrated horticultural areas perhaps growers could cooperate and invest in stocks together. To capture the problem of glass availability it is important for the whole industry to increase their stock, so in the near future glass can be lent to colleague-growers in need.That’s why Hagelunie advocates the standardization of glass sizes and the co-operation between the colleague-growers, which is paramount in making sheet stocks a success.

If you seek further advice on your glass stock?
Please contact us.