With a greenhouse you can extend the seasons and grow plants / vegetables that are struggling in our climate. Even during the winter months, a storage place for garden material or winter sensitive plants will certainly come in handy. A number of questions arise when you are about to purchase. Which material do I choose? What dimensions should the greenhouse have? What is the best orientation? Do I need a foundation? Below we try to answer the most frequently asked questions.


If you cannot find answers to your questions, do not hesitate to contact your point of sale: https://janssens-alusystems.be/dealers

DO YOU ALSO HAVE CUSTOMIZED GREENHOUSES?

You will find standard Action models on our website but also tailor-made greenhouses. If your dimensions differ or if you want alternatives, this might be possible in many cases. Please contact 1 of the sales points for this, they will be happy to answer all your questions.

DO YOU NEED AN AUTHORISATION TO BUILD A GREENHOUSE?

For many greenhouses you do not need a permit, for others you must report or apply for a permit.  These regulations are very specific and very between countries and regions.  Due to changing regulations, it is advisable to inform your local government about this.

WHY AN ALUMINUM GREENHOUSE?

Aluminum greenhouses are light and durable. They do not rust and require a minimum of maintenance. Another advantage of an aluminum conservatory are the narrow glazing bars, which allow extra light to enter the greenhouse. Moreover, aluminum is 100% recyclable and therefore an environmentally conscious choice!

WHICH GLAZING DO I CHOOSE? TRADITIONAL GLASS, SAFETY GLASS OR POLYCARBONATE?

GLASS: Traditional horticultural glass (3 to 4 mm thick) is most commonly used in greenhouses because it is cheaper than safety glass. However, it is less strong and when it breaks it shatters into sharp pieces. Toughened safety glass (EN12150ESG) is five to seven times stronger than horticultural glass and should it break in an extreme case, it will disintegrate into small, harmless pieces. All our greenhouses are fitted with 4mm thoughened glass as standard.

POLYCARBONATE: If you want to prevent glass breakage completely and also want to pay attention to insulation, you can opt for plastic. These consist of clear double sheets of polycarbonate and they insulate 40% better than single glass. If you want to heat the conservatory in winter, polycarbonate is definitely recommended. As a downside, it can be cited that polycarbonate is not transparent, has a cheaper appearance and in the long term less durable than glass. Our greenhouses are fitted with 4mm toughened glass as standard, polycarbonate is an option.

HOW BIG SHOULD A GREENHOUSE BE?

The size of a greenhouse determines the amount of plants you can grow in it. And it is filled faster than you might expect. You might start with a few tomato plants and cucumbers, but soon other plants will follow and before you realise, your greenhouse will be full.  Keep in mind that your hobby may expand over time and choose a greenhouse a bit bigger if possible. In a bigger greenhouse, the temperature will remain more constant compared to a small greenhouse. This is clearly noticeable in the results. An additional advantage may be that you can work more easily in a bigger conservatory. After all, you have more room to maneuver and you can change crops more easily.

CAN I ADD EXTRA DOORS OR WINDOWS?

Our greenhouses offer the option of installing the door in both width and length (except on Junior-models!). An extra sliding door should usually be possible. We offer promo-houses (standard packages with great price / quality ratio), these are set-packages and it is NOT possible to add extra roof- or side windows.  On all other houses you can configure to your taste!

DO I NEED CONCRETE FOUNDATION WORK?

It is important that a greenhouse is well anchored to the foundation so wind cannot get a hold of it.

All our greenhouses are already fitted with an aluminum foundation beam as standard. This makes a concrete base superfluous for the simplest models. This beam has a ground anchor on each corner. These points must be anchored in concrete AFTER installation so the greenhouse cannot move. In this case, extensive preparatory work is superfluous. You just need to make sure the ground is flat, free of obstructions and level. However, if your garden has a major fall or an unstable ground situation, it is recommended to provide a concrete frost-free base to guarantee the stability of the greenhouse. Details can be found in the regulations and manual. All dimensions on this site and in the manual are always OUTSIDE DIMENSIONS of the aluminum foundation beam.

HOW ABOUT MAINTENANCE OF MY GREENHOUSE?

It is recommended to clean the greenhouse at least twice a year. Make sure you do not use aggressive cleaning products. Some moving parts such as wheels or hinges can use a little bit of penetrating oil. During a storm, one should always close doors and roofwindows to avoid tearing them apart. The cylinder of the automatic window opener should be removed during winter, the freezing cold can cause the cylinder to freeze. During winter the roof has to be cleared of snow or supported in a suitable way. The greenhouse should be built in a location
protected from strong storms and winds.

CAN I USE A GREENHOUSE AS GARDEN PAVILLON OR CONSERVATORY?

As you may have noticed in our photos, our garden greenhouses are often used as a place to sit down, read the newspaper or relax with a glass. In a greenhouse you can place a floor and you can place (outdoor) furniture, but keep in mind that high temperature fluctuations can occur in a greenhouse, discolouration due to the abundance of sunlight, high humidity in intermediate seasons, draft, condensation and, last but not least, the possibility to serious water infiltration on the ground and in the roof (which is acceptable for a cultivation greenhouse).

KIES IK VOOR ONBEHANDELD ALUMINIUM OF VOOR GELAKTE PROFIELEN?

Aluminium is een onedel metaal: kan niet roesten maar zal door het contact met zuurstof uit de lucht spontaan oxideren. Hierdoor kan op termijn witte neerslag van alumiumoxides opstaan op de profielen. Men kan echter stellen dat dit in zulke mate is dat het aanvaardbaar is voor de tuinier en geen problemen zal veroorzaken.
De keuze voor oppervlakte behandeling is dus een zuiver esthetische keuze! Het lakwerk dat wij aanbieding is steeds hoogwaardige poedercoating in RAL-kleur, een elektrostatisch verfproces waarbij poeder in de oven wordt uitgemoffeld.

WHAT ABOUT WARRANTY?

You benefit from the following warranty periods:

  • 10 years on quality and alloy of aluminum;
  • 10 years on the paintwork / powder coating in case of detachment, peeling, peeling, corrosion, chalk, discoloration and loss of gloss in which the predetermined tolerances are exceeded according to the specifications of Qualicoat or Qualinod;
  • 10 years on adhesion and tension of glazing rubbers;
  • 10 years on production defects in the glass;
  • 5 years on PVC parts and their UV resistance

Not covered by warranty:

  • non-observance of installation and operating instructions other than foreseen normal use
  • lack of maintenance
  • normal wear and tear
  • materials or goods used at the request of the customer
  • constructions that are not part of the standard-Janssens-range but manufactored at the request of the customer/distributor

We would like to point out that our products are garden greenhouses for growing vegetables, fruit, flowers, ... This means that certain things are inherent to the product that vary per situation, environment and use: condensation on glass or on profiles, drafts at doors, windows or cracks skylights, roof connections, gutters are not 100% watertight, flood under the foundation profile ...

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