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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 Kits 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 model.