I'm not a chippy and am confuddled by all the types available.
I plan to use 4" x 2" for nearly all the framework, the bottom section will be sat on concrete, it needs to be well suited to being outdoors 365 in the UK climate and to chicken poo.
So, Regularised C16, Planed whitewood PSE, C16 Sawn Treated.... or any others????
I don't mind treating it myself.
Longevity is of importance compromised of course by budget.
Ta.
"Tannelised" is the word you need to be thinking about.
Slight hijack but i need to ask a question thats kinda related.
Is Tannalised timber the same as treated? often wood outside in the yard is just seems to be called treated.
For outside and not stuff you're handling all the time I'd say treated sawn (tannalised is treated) should be the right balance of price/longevity. I'd be thinking about whether the birds ever chew on the timber, then I'd be wary of poisoning them with wood treatment.
"Tannelised" is the word you need to be thinking about.
Indeed, lasts for a while, but treat it anyway especially the cut ends.
so... sawn treated IS tannelised, yes 
Sawn timber is just that straight fron a tree its sawn, treated is sawn timber, but treated by either being imersed in a tank, or a cylinder and the contents pressurised so it soaks into the timber.
Be aware a lot of preservatives are poisonous to animals and fish.
Tanalised is a trade name,for treated timber
project, thanks for clearing that one up
I'd probably go for cedar but I'm not big up on wood for that kind of thing. Might be a bit pricey too but it depends if you want it to look good.
Possibly also redwood. Definitely do not use pressure treated (aka tanalised)
doesn't really matter unless you get railway sleepers, put apple tree braches in, birds will go for them first.
bred everything up to splendids with that with ronsealed wood stain
Being a fencing contractor we use a lot of wood and have noticed the quality of Tannelised decline because they banned the use of a certain chemical. You're better off putting it up and then painting with a preservative
Tannelised " Timber has been impregnated with a preservative solution under high vacuum pressure
in an industrial vessel. This treatment process ensures deep penetration into the timber cells for a
longer lasting result.
I would use Beech. what park benches are normally made of.
mate and i had a job and we were having to plane shit loads of timber. the guy from next door asked if he could take the shavings for his rabbits.
when we were there a few weeks later he showed us his new rabbits.
then the penny dropped... treated timber = chemicals = dead rabbits.
oops. sorry.
Id use larch, resistant to rot without preservative and weathers a nice grey colour.
yeah Larch would work.
I love wood 
I want a wooden bike.
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