These will make a sharper tapping noise.
Asbestos internal wall sheeting.
Normal plasterboard afaik has never contained asbestos.
Cement sheeting was made of asbestos fibres and cement mix usually in the ratio of 1 9.
Asbestos was used in a number of different materials that were used to create walls which makes visual identification difficult.
Ldb is a lightly compressed board containing asbestos fibres in a calcium silicate plaster.
If your home was built after the 1930s your interior walls are probably at least partially constructed of drywall which was and still is typically sold in four foot by eight foot panels.
Flat sheet fibro is the most common asbestos cement sheeting.
It was simply nailed to a wooden framed structure making construction quick and cheap and could be painted.
The asbestos fibres are bound in the cement matrix preventing them from moving.
In single family dwellings these sheetrock boards did not usually include asbestos fiber although until 1980 heavier insulated cement boards used as firewalls between units in apartment houses and commercial buildings often did.
Asbestos cement sheeting typically contains between five to 20 per cent asbestos.
Asbestos is in fibre cement sheets ie wall panels made of cement it is hard.
Ldb can contain up to 70 per cent asbestos fibres by volume.
Aib s were used in both commercial and domestic properties to create walls.
It is sometimes referred to as asbestos insulating board.