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Bonded membrane

Mounting plates provide a safe and durable way of fixing PV modules to waterproofing membranes. They cut the weight of the system considerably – no ballast is needed – and do not damage the existing membrane.
Our analysis showed that the stress in the membrane stays well below the allowable value (Protan 1.2 mm), which mechanical tests later confirmed.

Bracket with a rounded outline – stress drops to 261.5 MPa and spreads along the edge
Rounding spreads it along the edge – 261.5 MPa with a smaller plate.
Photovoltaic modules on a roofing membrane, with the mounting plate enlarged
Four stages of installation: mounting plate, bonded membrane patch, fixing and the finished module
Installation without piercing the waterproofing – the plate is bonded into the membrane.
Map of membrane deformation around the mounting plate from the FEA model
Stresses in the membrane stayed well below the permissible values.
Contour plot of membrane displacement in section – from blue at the supports to red at the crest
The membrane works across its whole area, not only under the fixing.