Composite Decking 4.8m x 30mm

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I have a balcony that is in the process of been replaced.

I have planned to put composite decking down to try and reduce maintenance.

My problem is: I have 5 support beams protruding from my house, they are each just short of being 1 metre apart. with the total distance being 4.8 metres.

I am therefore looking for composite decking that can straddle the ~1 metre span without sag and ideally have no joints.

I have tested this at a local building supply and their 25mm thick hollow section sags a lot (see pic).

I have since sourced 30mm hollow section but doesn't come in 4.8metre lengths.

Does anyone know if 4.8metre x 30mm or thicker lengths exist?

IMG-20170811-WA0000.jpg IMG-20170811-WA0001.jpg IMG-20170811-WA0002.jpg
 
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won't you need building control and structural calcs? That is quite a height to risk falling from.
 
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Even if the house was already built with a balcony?

I'm only replacing what was already there, obviously not going to fit anything that's dangerous on my own house.
 
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You could add extra timber in between existing to reduce span or overboard with ply, then you can use any thickness of board on top .
 
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So the builders that built this house in 1970 were potty?

And the balcony that I used until I decided to replace it was unsafe?

I'm only trying to replace something that stood for 47 years, and the house had planning permission with the balcony.

If I can't replace it with composite then I'll go for thicker timber decking.
 
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I don't know, you've not told us! Maybe you could enlighten us? Is it timber then? If so how thick is it?
 
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