Reduced thermal bridge L bracket for awning

[kxi]

We have some large south facing windows that need shading and awnings seem a good solution in our circumstance (for various reasons). E.g.

https://www.markilux.com/en-gb/patio-and-balcony-awnings/markilux-mx-3

 

However, the problem is we are using a heavy steel frame construction, clad with cladding panels. The cladding panels are two thin steel sheets sandwiched over insulation and so you cannot hang something as heavy as a big awning off them. So the suggestion is to attach to brackets that go back to the steel frame. But this goes through the insulation layer (about 150mm of foam) and so creates a thermal bridge, and while that's a small area it's a potential condensation point - not great on a steel frame.

 

One option is to just use a metal L bracket + structural thermal break (armatherm or farrat), as illustrated below. But I wondered about using a different material for the L bracket that has lower conductivity, for example .... GRP? It has to be fairly long - perhaps 250mm to get through the insulation layer and leave space to attach things to

 

 

You can get off the shelf L profiles in GRP with unequal legs - 300mm and 40mm at 6mm thick for example.

https://www.engineered-composites.co.uk/products/grp-pultruded-profiles

Which you could then cut into L bracket lengths of say 100mm

 

Any thoughts on what material might be best? (Will be asking the SE)