No membrane used, remains pretty dry under there year round although a few drips. I would likely black silicone the panel gaps if I wanted full weatherproof.
My pergola was not built as a PV array carrier. It was built as a hot tub area. It's 8" posts in the round driven about 2 foot into the ground and belled at bottom before concreting in place. Main structural members holding those posts together are 4" square. The pv carrying timbers are 4" x 2". M10 coachbolts and No 5 screws to hold it all together and a good rail system to screw thru into the 4"x2" timbers.
No big PC access at the moment and in Turkey, phone only so sadly no photos.
Panels on Pergola
Re: Panels on Pergola
15kW PV SE, VI, HM, EN
42kWh LFPO4 storage
73kWh V2H EV
7kW ASHP
200ltr HWT.
3G
Deep insulation, air leak ct'd home
WBSx2
Low energy bulbs
Veg patches & fruit
42kWh LFPO4 storage
73kWh V2H EV
7kW ASHP
200ltr HWT.
3G
Deep insulation, air leak ct'd home
WBSx2
Low energy bulbs
Veg patches & fruit