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So, whats the thinking behind choosing one or the other ? Its going on a galvanised frame already fitted to the house, 4.2m x 3m up at first floor level..
Thinking smooth rather than fine or coarse grooves for bare foot friendly outdoor walking...
Whats the recommendation between these two timbers, Douglas or Larch ... or am I missing something else... ?
Douglas Fir generally more durable, although neither would require any coating and probably better if left au natural. Western Red Cedar also applicable, bit more grippy. Use non-ferrous fastenings with all of them as the acids that keep them from premature decay will eat ferrous fastenings quite quickly.
Cost wise, it all depend upon what your local saw mill has plenty of, Larch tends to be cheaper.
Number one.......
The Larch.
We went for Yellow Balau, which is relatively expensive, but very good. Not slippery if wet. Looks great.
Thanks, interesting re no treatment, I was under the impression that some form of decking paint would be needed...
Only the cheap decking needs treating. Woods like Larch, Fir and Balau, Ipé etc are used in decking as they are extremely weather resistant, and may have natural oils which help protect them. In my experience, cheap decking is false economy, as it will need treating which is a pain in the arse, and may still not fare that well.
Western Red Cedar
Douglas Fir
Larch
In that order would be my choice, although thinking about it, could just as easily go with oak, but may need a strong frame and fixings.
If you're going for larch, make sure it's Siberian Larch. Cold weather means much more durable.
No need to treat it if you do.
For the most durable, have a look at Accoya, a 'pickled' timber. 25yr no treatment guarantee. Not sure about cost though.