How can we prevent wooden posts rotting?

[Mikey & Annie]

We have a trellis fence which is all wood, the posts being concreted into the ground. We erected it three years ago and had to replace a post last December, even though the posts are tanalised - i.e. pressure-treated. We would like to find a suitable chemical that can be applied to the underground part of each post that would drive any water out and seal the post to make it last as long as possible. Could anyone recommend a suitable product?

[Hammer]

Pressure Treated Posts should last 15 years or more, and should not rot in 3 years. Can you talk to the place you bought them from ? They may carry some kind of Guarantee ?
Tanalised wood will rot just the same as ordinary untreated wood if you cut into it or drill it.
Regards Hammer

[colin1957]

Hi, I got some fence posts treated the same way as yours but i gave them a good coat with creosote before putting in the concrete and creosote them above ground every year and they have lasted 6 years up to now

[Mikey & Annie]

Thanks for that advice but can anyone tell us which is the least soil-polluting chemical to apply? There are raspberries a couple of feet away!

[realfood]

Creosote was withdrawn from sale several years ago.

[GMB27]

Originally Posted by Mikey & Annie

Thanks for that advice but can anyone tell us which is the least soil-polluting chemical to apply? There are raspberries a couple of feet away!

Im not sure how deep your posts are but ive had a job similar to this in the past with a chicken pen. The legs went deep to stop the foxes digging under. The posts had been in about 5 years and the owner wanted them protecting. If you can get to them, dig around to expose the base (do this on a dry day) and then paint with a creosote alternative. Ronsons do a really good product for doors, try that. Just be sure its quick drying and done before you bury it back in!

[Mikey & Annie]

Thanks GMB27. Sounds advice methinks.