Flat roof

[akaPABLO]

I would never, ever go flat. You are asking for a lot of trouble. The best system is the K2 dome illustrated previous. Once you get water ingress the panel is shot.

 

[midsummerenergy]

The Solion are a good option for flat roofs. For a really flat installation you could go for something like this: https://www.flickr.com/photos/midsummerenergy/14537045420

 

[liam b]

Paving slabs with unistrut and zebs, mid clamp bolt straight into the zeb

 

[whlphil]

Thats Panel Claw, Sunfixings sell it in the UK they call it Light Tegra

Renusol do a new metal post that can be ballasted or fixed and felted over I think - FS10

Nicholson roof track do a system that can be secret fixed and felted into the roof - ROOFTRAK? | Nicholson

Perhaps the nicest one though is from Danish company Jual - JUAL which can be retro fitted to felt and they're real nice guys, speak to Henrik

Don't forget most manufacturers have a limitation of min 5˚ pitch in their warranties, of course you could fit Solar Frontier as they don't have pitch reliant warranties, but sounds like space might be an issue.

Enjoy