Skavenger
Any chance you can post of picture of how it's weathered please.
I will be doing some cladding soon, and was curious how it looked a year or so later.
Cheers
Any clear coating, osma, danish oil etc will not provide much protection.
Coatings without any pigment will get broken down by UV quickly. So any sides that get much sunshine will get the coating burnt off in prob 6 months. If left the sunlight will kill off the lignin and the wood will start to go grey.
Siberian Larch is naturally very durable, it has high tannin and resin levels and it has the density of oak. It will last many years without any surface treatment, however it will go patchy visually, areas in the shade will retain their original colour but exposed areas will go grey and get water stained.
If you want to keep the original colour as long as possible I would simply treat with a clear wood preservative that has water repellant in it. Barratine coatings are good and I think do a clear, they are available in toolstation.
I made a large garden cabin and clad it with Siberian larch feather edge, but I used barratine golden, which on the rough sawn surface turned it a rich colour.
It's a fantastic timber - I used to import Siberian larch from Germany to make orangeries and joinery.
