Why is there fungus on my new ply roof (pics included)?

JohnD said:

if you have dried it off by improving ventilation and reducing humidity it wil clean off easily. Even bleach will kill it.

If it is still damp then you still have a problem.

I prefer Cuprinol Green or Clear, the fence stuff may give off fumes used internally. Wickes may have an equivalent own-brand for structural timbers.

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Oh no, I have bought this already? will it give off fumes/smells continuously in the long term or just whilst painting it?

it shouldnt give out fumes once dry tony! just leave the door open to air the place .

thanks again guys....

The mold stuff has been brushed off, cleaned with Fungicidal wash, and painted it with Shed and Fence preserver. Please see todays photos below of it cleaned up (but there are still stains under the paint where the fungus was Should this be enough cleaning and can I know fit the insulation, vapour barrier and plaster board?

PS I still havent bought the vapour barrier as normal DIY stores do not have it.

Tony

Treat the timber with a fungicide solution that you should be able to get from a good painters merchant. You simply brush it on. Then address the cause of the condensation. Excessive moisture coming into contact with a cold surface will result in condenstion and mould. Either remove the source of the moisture or insulate (or both)