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my Dad's shed had a roof that he didn't take care of for a while and now appears to have rotted in several regions.

I'll provide several pictures, but the video is best: Link

What is the best way to approach a problem like this, and what would be the best solution to it. Also, what is the likely extent of the damage so far, and is this a risk to the roof failing?

Left Side: Left Side

Right Side:

enter image description here

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The black is bad get a screwdriver and see if the plywood is compromised. Push on the screwdriver and if it goes into the wood 1/8 “ or further the wood needs to be replaced. If it is still solid I would use a very strong solution of hydrogen peroxide and water 5-8% and saturate all the fungus areas a second treatment may be needed but this will kill the surface fungus that will break down the plywood.

Note 8% hydrogen peroxide will bleach just about anything including your hair so use ppe. It can be applied with a paint roller or sponge, at this strength I would not spray it as I do with 3-4%.

AAA. Always add acid to water to reduce the exothermic reaction when diluting concentrated hydrogen peroxide with water.

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