The Cathedral – the height of elegance
The Cathedral is more a destination than a building. With voluminous proportions it provides you with an elegant multipurpose building that can be used for a wide range of leisure activities or possibly commercial purposes like weddings.
Some of the many reasons to buy a Janssens Cathedral
Basic Price Includes
- Very strong box section profiles
- Integral aluminium base profile (under the four walls)
- 4mm clear toughened glass
- Full length rubber glazing strips to secure the glass
- Double Sliding doors, door locks, roof and louvre vents as detailed under the price
- Full length rainwater downpipes
- Stainless steel nuts and bolts
- Decorative finials and ridge crestings
- Powder coated frame
- Instruction manual and assembly DVD
- Delivery in kit form by truck
Base Profile
Corner Glazing Bar
Roof Glazing Bar
Ridge Bar
Gutter Profile
Rubber Glazing Strip
Rainwater Downpipes
Watering sprayline
Stainless steel nuts and bolts
Spindle roof vents *
Decorative finials and ridge crestings
Price your very own Cathedral
Frame Colours
Type of Finish
Polyester powder coating protects the aluminium frame from tarnishing with exposure to the elements and is available in a wide range of attractive colours. It is a durable long lasting finish, a bit like enamelling.
Add: €330
We have a range of standard colours to choose from but you can also nominate a special colour (using the RAL numbering system) if for example you want to match with the finish of your house nearby.
The standard colour choices (apart from Mill Finish) are:
Select
Green
(RAL6009)
Black
(RAL9005)
Dark Grey
(RAL7016)
White
(RAL9010)
Light Grey
(RAL9006)
Custom RAL
Custom
Colour
Coloured Rubber Glazing Strip
Rubber Glazing Strip (this is to be in the same drawer as powder coating)
Glass Pane Size
More Info:
Janssens offer a choice for most models of 37cm or 73cm wide panes of glass. It is primarily a question of what you like the look of. Some people think narrow panes look nicer, some rather wide panes, it is a matter of personal preference. A Greenhouse with narrow panes does cost more as it has more aluminium and will take a lot longer to build as there are nearly twice as many panes and glazing bars. The narrow pane model is marginally stronger.
We also have available on request K Glass (more thermal efficient) and 10mm twin wall polycarbonate, please ask for the price if these are of interest.
Choices: 73cm (default setting) or 37 cm
Choices: 73cm (default setting) or 37 cm
Louvre Vents
Janssens' louvre vents are a generous size (opening of 69cm x 93cm) giving great ventilation. The louvre frame is always supplied in black, but being a neutral colour it nearly always blends in. Automatic openers are available for louvres but we suggest you automate roof vents but leave louvre vents manual (unless extreme weather is forecast they can be left open in summer and closed in winter). We have allowed for what is considered adequate ventilation by our experience in the basic Greenhouse price but you can never have too much ventilation on a warm summer day.
The maximum number of vents is based on the size you have selected above.
Top Hinged Windows
Some customers prefer the look and feel of Top hinged windows over louvre vents. They can surprisingly change the look and feel of a structure.
Here you can change your louvre vents for top hinged windows and if you prefer and if you wish you may add additional windows to enhance the ventilation capability.
Decorative Aluminium Panels
Ornate aluminium 'retro' panels, available in three designs, which give a stunning look. This option will create an unusual feature in your garden and may be the ideal choice where you want to use the structure for an alternative function instead of a Greenhouse, for example as an artist's studio.
Panel A
Panel B
Panel C
Dwarf Wall Model
A Dwarf Wall Model makes for a very attractive feature in the Garden and has practical advantages too. It means one can build raised beds inside the walls, the temperature in the summer is a little cooler and winter temperatures a little warmer apparently. The wall is normally built and organised by the customer and is not included in the price of the Greenhouse. General instructions are available to download on this website but after an order has been placed we will be pleased without additional cost to give a drawing specific to your order for you to give your builder.
There are three standard heights of wall that the Greenhouse can be manufactured for:
263mm wall
463mm wall
663mm wall
90cm Extra height
The Cathedral can be ordered with 90cm extra height if desired – may suit someone who enjoys growing trees for example.
Hinged or Sliding Doors
Sliding doors have been included as standard but here you have a choice to change to hinged. Doors can be fitted to the gable or the side of the Greenhouse.
Hinged doors give a Greenhouse a more traditional look than sliding doors. Janssens' Hinged Doors are fitted with hydraulic door closers to pull them closed automatically and they are fitted with a lock.
With a Dwarf Wall Greenhouse, if you have a sliding door it slides quite close to the outside face of the wall, and the track that the door slides in is very narrow and must be kept perfectly straight. This means that if you have a builder who will build a nice straight, plum wall with a flat face there is no problem, but if you are for example using stone it will be better to go for a hinged door to avoid problems.
Decorative finials and ridge crestings
Ornate ridge crestings and finials provide a bit of extra Victorian style bling to your Greenhouse. It is a question of personal preference and you can select your choice here.
Ornate Ridge
Plain Ridge
Low door threshold
Sliding door entrance with lowered threshold
The standard door entrance has a threshold bar going across at ground level which is 118mm high (to step over). For most customers this is not an issue but where a lower threshold is desired – for example for wheelchair access we offer a service to modify the door entrance to be only 40mm.
Customer can place after installation of the Greenhouse concrete slabs or raise the floor level inside and outside to be flush with this so there is effectively no lip.
Dwarf Wall Greenhouses only
The standard door entrance has a threshold bar going across at ground level which is 118mm high (to step over). For most customers this is not an issue but where a lower threshold is desired – for example for wheelchair access you can simply reduce your wall height by up to 100mm so that the door threshold bar will be submerged except for the lip that the door will close against.
Normally the door has a clearance above the outside ground level of about 110mm (the doors open outwards), when you lower your door threshold by 100mm of course the clearance will only be 8 or 10mm (so will only suit ground that is perfectly flat or sloping down away from the greenhouse).
Glass to Ground Greenhouses (or Dwarf Wall Model customers who don't want to lower their walls)
The standard door entrance has a threshold bar going across at ground level which is 118mm high (to step over). For most customers this is not an issue but where a lower threshold is desired – for example for wheelchair access we can modify the Greenhouse to have longer doors and door posts so you can submerge the door threshold bar to reduce the lip by up to 100mm.
Normally the door has a clearance above the outside ground level of about 110mm (the doors open outwards), when you lower your door threshold by 100mm of course the clearance will only be 8 or 10mm (so will only suit ground that is perfectly flat or sloping down away from the greenhouse).
Accessories
Automatic Vent Openers
Simple devices which open and close roof vents automatically for you according to temperature. They contain an industrial wax-like substance inside a cylinder which expands and contracts with according to the temperature and pushes or pulls a rod that opens or closes the automatically. The temperature at which they open and close can be adjusted by hand but you cannot manually open the vent. The cylinder containing the wax-like substance is a consumable item but typically lasts a number of years and can be easily replaced. Generally in windy weather automatic openers are cooled down by the wind and so close the vents.
Thermoforce HD3400 Automatic Vent Openers
This robust opener has a strong closing force. It has a maximum opening of 35cm (14") and comes powder coated in a black finish. Its opening range is between 15C and 25C.
Bayliss Hydraulic Check Autovents (for more exposed locations)
The Hydraulic Check Autovent has a small hydraulic damper which only allows the vent to be opened slowly but it can shut quickly, thus protecting the roof vent. The hydraulic check Autovent is advisable in areas where severe conditions are encountered. It can be set to start opening at temperatures between 16C and 23C. Supplied with a satin anodised finish.
Seedbeds
Don't be fooled by the name, a seedbed can fulfil many purposes. First and foremost it provides a comfortable surface on which to pot up and tend to plants. You can use it to display plants on and it gains you additional space in the Greenhouse. A seedbed can be fitted with capillary matting to assist even water distribution among your pot plants or you can fit an electric thermostatically controlled heated mat in it to make a propagator.
Multiple units can be fitted. They can be fitted along the full length of the side and/or across the full width of the gable ends. Each seedbed frame is made from aluminium in the same colour as your Greenhouse and the tongued and grooved plastic panels which make up the bottom are white. The seedbed is 500mm wide.
Shelves
The Janssens shelf is an aluminium section 115mm wide. It is useful for small pot plants and odds and ends like gloves, secateurs and other small odds and ends. A shelf also adds to the already powerful strength of the Greenhouse. It is supplied in the same colour as your Greenhouse.
Self-build or constructed by Greenhouse Ireland Craftsmen
This model must be built by us, it is not suitable for DIY building. We need to know the location of the site before pricing construction. To obtain a quotation for this Greenhouse that you are pricing please click on the button below.
Our construction service price is based on any foundations, ground works and walls being prepared by the customer in advance of our arrival on site.
Details on foundations are available on the instructions tab on this website page, and we will be pleased to discuss any queries you have and if necessary provide further drawings specific to your Greenhouse once an order has been placed.
Our construction service is subject to some terms and conditions (link to the details here):
Delivery
The Greenhouse will be delivered by our constructors when we come to build it.
Lead Times
The lead time is the estimated length of time from when your order is placed to when we arrive to start building. This is a guideline only as lead times may vary according to demand and logistical considerations.
Normal lead time is eleven to twelve weeks from receipt of order.
Assembly Instructions
Foundation and Dwarf Wall Drawings:
Instruction Manual for Cathedral:
Drawings of Glass Pane Sizes (various models):
Overview of profiles and reference numbers:
Dimensions
Model illustrated is
Example:
Width (A)
310cm
Length (B)
606cm
Eaves height (H1)
201cm
Area (m2)
18.79
Ridge Height (H2)
274cm
Max. Doorway Width
Sliding Double
70cm 144cm
Optional features (details and price available on request)
Extra doors
Extra Hinged or sliding doors may be added and fitted to the gable ends or sides of your Greenhouse.
K Glass
K Glass is horticultural glass with a coating which greatly lowers its K value (heat loss value). With K glass you can have the benefits of insulation without the downside of not being able to see through it clearly. K Glass is the same price as 10mm twin wall polycarbonate but is not toughened so not as strong or as safe as toughened glass (which shatters into tiny pieces rather than big shards) when it breaks. We will be pleased to quote for it on request.
