How long will douglas fir posts last untreated?

[AHPP]

They’re not stacked! Is this a coded distress signal?

[Woodworks]

Just now, AHPP said:

They’re not stacked! Is this a coded distress signal?

? No need as the wood was sub 25% when it went in. 

[topchippyles]

Douglas fir is the hardest softwood in the uk and harder than a lot of hardwoods.

[se7enthdevil]

2 hours ago, topchippyles said:

Douglas fir is the hardest softwood in the uk and harder than a lot of hardwoods.

yew is much harder.

[topchippyles]

13 minutes ago, se7enthdevil said:

yew is much harder.

You are not correct sir,Douglas fir is far more harder

 

Wood Durability Guide: Timber Chart & Database | Gate Expectations ...

[Big J]

7 minutes ago, topchippyles said:

You are not correct sir,Douglas fir is far more harder

 

Wood Durability Guide: Timber Chart & Database | Gate Expectations ...

Yew - 1520lbf on the janka hardness scale

DF - 660lbf on the janka hardness scale

 

Therefore we can deduce that douglas is 43% as hard as yew.  

 

And from a durability point of view, there isn't anything that is widely grown in the UK that is more durable than yew heartwood.

Edited September 12, 2018 by Big J

[topchippyles]

26 minutes ago, Big J said:

Yew - 1520lbf on the janka hardness scale

DF - 660lbf on the janka hardness scale

 

Therefore we can deduce that douglas is 43% as hard as yew.  

 

And from a durability point of view, there isn't anything that is widely grown in the UK that is more durable than yew heartwood.

Yes you are correct,My mistake and both great woods to work with.

Edited September 12, 2018 by topchippyles

[Woodworks]

Worth mentioning that hardness and durability do not go hand in hand. A hornbeam post wouldn't last 5 mins in wet ground where as a cedar post would have a good long life.

[devon TWiG]

To  increase the longevity of your posts where they go in to the ground dump some salt around them each year to keep the soil "hostile " to wood decaying / boring organisms . 

[Woodworks]

36 minutes ago, devon TWiG said:

To  increase the longevity of your posts where they go in to the ground dump some salt around them each year to keep the soil "hostile " to wood decaying / boring organisms . 

Thats a great tip. Thanks