Finally if you do use fanfold you should tape the seams.
Nailing into asbestos siding.
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.
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.
You can t drive screws and nails through them without pre drilling.
I told the contractor who recommended it for a rental in nc to call me in 15 years and let s see how it holds up.
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If you don tape you can just install some tyvel wrap over the fanfold.
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.
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.
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.
Exposure to and breathing asbestos fibers can result in lung problems and cancer.
Asbestos shingles are relatively strong but brittle.
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.
Start by hooking the siding on the bottom of the starter strip with the nail holes facing upward.
You can t nail through the asbestos siding if it is the rigid kind it is brittle and will shatter.