Decking joist timber

Joined
2 Dec 2015
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United Kingdom
Morning,
Hearing different things about what timber to buy for decking timber.
Having looked at the various tables 5x2 (125x47) is ok for span / loading but what treatment class?
Everyone seems to sell UC2 but it 'appears' as though I need minimum UC3 and ideally UC4.
Can anyone clarify?
Nothing is ever easy.....
 
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Ordinary pressure treated tanalised timber is class 4 from what I can find
 

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