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I was looking at this setup.
The roof of the garages is standard bitumen felt stuff, whatever it's really called, and I was going to bond the frame to the roof using Black Jack roof cement.
Dammit-
I wouldn't rely on just that to ix to the roof, might be ok for small items but I would imagine the first bit of strong wind and they'd be off!
Proper way would be to break through the existing rood finish and create a upstand which could be fixed to the garage roof structure and the frame fixed tot the top and new waterproof layer bonded to the top of the existing roof and up and over the new upstand.Easy way would be some sandbags or similar heavyweights on the frame of the PV panels and not touch the roof membrane.
Is the condition of existing roof finish ok?
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I was going to bond the frame to the roof using Black Jack roof cement.
That looks more like it's for repairs like a bitumen in a tin, rather than a fixing / bonding compound.
To stop the thing wandering off (theft / in the wind) you'll need to fix it to something mechanically. You could create upstands then bolt them to the existing the roof surface (possibly ply over a wood structure), then fix the frame in to those. Could just be a block of treated or hardwood wrapped in roofing felt. That cement would be useful to seal it, both to the existing roof surface and where you bolt something to it.
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Black Jack is just a paint-on waterproof membrane. It might be tacky, but it's not an adhesive.
pryally
Howard
Ben689908
What's the existing roof covering? The trick will be to get a good fixing on to the roof without fucking up the existing weather proofing. Is there any brickwork you could fix to instead?
I'm tempted to try something like this on the roof of our garden palace (shed). What kind of panels are you going for? How much juice do they deliver?