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Default composite/metal purlins instead of timber ?

I have a shallow pitch roof design that involves 225mm timber purlins
supporting 50mm counter-battens, then battens and interlocking concrete
tiles. Span of purlins is 4 metres. (Insulation between purlins based
in knauf insulation examples). Then purlins were to be hung from
masonry using joist hangers.
What could I replace the timber with in order to make the roof thinner
? I have no experience with composite beams etc.
Cheers,
Simon.

 
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