These Triangle Supports are long diagonal beams that are used to support the underside of the longer roof rafters in the Janssens Modern greenhouses.
Note also that in order to support the longer roof glass panels of this unique glass greenhouse design, the aluminum roof rafters on the Moderns are already twice as thick as our normal greenhouse rafters.
The standard sizes of Janssens Modern Pent Roof Glass Greenhouse Kit already come standard with some triangle supports. You can add extra additional triangle roof supports for the Janssens Modern greenhouses - up to one for every internal rafter. Be sure to select to correct size for your Modern.
- M23 - comes with one triangle support, can add up to two more
- M34 - comes with two triangle supports, can add up to three more
- M36 - comes with two triangle supports, can add up to five more
Roll-up shades, when used, must be installed between these triangle supports in the Modern greenhouse.
WARRANTY
15 Year Limited Warranty

Janssens Greenhouse Assembly Overview
What Makes Janssens a Quality Greenhouse Brand
Janssens greenhouses are renowned for their European craftsmanship, superior materials, and long-lasting design. Every detail is built to exceed the standards of most competitors in the same price range, ensuring exceptional performance and visual appeal.
Premium Construction and Materials
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Heavy-duty aluminum frame: Janssens uses thicker, stronger aluminum profiles than most greenhouse brands, giving each structure superior rigidity and weather resistance.
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Corrosion-proof hardware: All fittings are made from stainless steel, preventing rust or deterioration in humid or outdoor environments.
High-Performance Glazing
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4 mm tempered safety glass: While many greenhouses use 3 mm glass, Janssens provides thicker, TÜV and GS-certified tempered glass for better insulation and durability against wind, hail, and impact.
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Full-length glass panels: Each glazing sheet is a single, unbroken panel that creates a sleek, modern appearance—unlike the overlapping or segmented panels found on many other brands.
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Weather-tight sealing system: Heavy-duty rubber gaskets hold the glass securely in place, improving insulation and reducing heat loss during colder months.
Smart Design Advantages
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Integrated foundation frame (4” high): Included with every Janssens greenhouse, providing a stable, level base that other brands often charge extra for.
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European engineering standards: Janssens greenhouses are precision-built and independently tested for strength, safety, and long-term reliability.

PRODUCT DESCRIPTION
