This would trigger dust and asbestos dust is a problem as i ve mentioned.
Nailing into asbestos siding.
Finally if you do use fanfold you should tape the seams.
You can t nail through the asbestos siding if it is the rigid kind it is brittle and will shatter.
It is very brittle and has a tendency to crack and break when nailed which can release asbestos fibers into both the air and ground.
There is a vinyl siding product that uses adhesive instead of nails but it has not been in field use long enough for me to consider it.
But using a fast grab contact adhesive can remove the need for nails altogether as the nails would really be only to hold in place until the adhesive cures.
Asbestos shingles are relatively strong but brittle.
If you don tape you can just install some tyvel wrap over the fanfold.
Start by hooking the siding on the bottom of the starter strip with the nail holes facing upward.
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Now that you have your backer board up and set firmly in place you can put the siding up safely without worrying about the asbestos falling down behind the siding.
Back to the vinyl or hardie if there is no solid sheathing under the asbestos only fiber board you will need to makes sure you are nailing directly into the studs.
Covering old asbestos shingles with new siding may seem like an option too but it s not easy to do safely.
Usually one would use fibre cement nails usually 30mm x 2mm so they through to the timber frame behind but they come with a flat head so are not suitable for panelling.
Exposure to and breathing asbestos fibers can result in lung problems and cancer.