Best outdoor wood sealer C24 timber

[Jason Wheeler]

OK - am building a ramp which will take a wheelchair and “pusher” about 4m long - using 6” x 3” C24 timber as joists (4 across a 1m span and supports every 1.25m or so so it will be solid).

The wood is treated but obviously not designed for outdoors, and have no access to creosote or similar - can anybody recommend a decent commercially available preservative? One side of the ramp will be bolted to a wall and it gets quite a bit of rain water running down it and having removed an old wood store that was against the walls the timbers were pretty shagged after 4 years.

 

[Jameshow]

Can you not get tannalised timber. I would think a good wood preservative from a well known firm should do. Ronseal, cupranol etc.

 

[Jason Wheeler]

Can you not get tannalised timber. I would think a good wood preservative from a well known firm should do. Ronseal, cupranol etc.

 

[Jason Wheeler]

Sadly not for the right dimensions - I’ll give it all a bath in Cuprinol!

 

[JimTaylor]

I use Osmo uv protection oil on my shed cladding. Two coats to start with.
Expensive but so far so good.