Waney edge larch mould

[Kirk]

Hi all

just wanted to check your thoughts on this. 
I’ve fitted my cladding this week and a lot of the larch has black mould spots ( think that’s what they are) 

the look doesn’t bother my as I think it adds character but I’ve notice it’s starting to go white and grow mould. 
will this cause me a problem , ie rot in future?

will it possibly go away when the wood dries out? Or should I treat it now

thanks in advance 

[Thedreamer]

Hi, we had those black spots on our Siberian larch.

 

When the timber starts to sliver it's less visible.

 

On ours it was more prevalent on the sides that get less sunlight.

 

Our timber didn't have the bark on it so not sure on that mould, but as it's open to the air it it won't be rot or cause for concern.

 

The cladding needs some time to settle to it's new surrounding as it's a natural product.

 

If you are planning to treat it I would leave it for a bit before putting on a something like osmo.

 

Thanks

[Roundtuit]

I've got similar on my larch. I'm lead to believe the mould is living on the sugars in the sap wood, and will exhaust its food supply in time and then fade as the timber weathers.

[Cpd]

I had some black mould on some ply wood and wanted it gone so I sprayed it with a good quality thin bleach and it looked like new ! Not sure if this would work or if it’s necessary but could be an option if you needed it gone. (I say good quality as I also tried using tesco own brand thin bleach When I run out of good stuff and it did next to nothing which was mildly alarming......) 

[Kirk]

That’s great thanks. 
I will leave it over the summer to see how it develops. Then maybe treat it with Osmo before winter

 

ive read that bleach discolours this timber quite badly so I may stay away from that