If you have vermiculite in your attic, you should always assume that it is contaminated with asbestos to prevent exposure to you and your family. It is important to avoid any manipulation or disturbance of the vermiculite, as these actions could spread volatile asbestos fibers into the air and it is these that are very damaging to health if inhaled. You must therefore refrain from going into the attic (attic), carrying out work near the vermiculite (e.g. installation of a recessed light, electrical work in the attic, etc.) or even use the attic for the storage of goods.
The level of health hazard is closely related to the amount of asbestos fibers that are inhaled and the frequency of exposure to these fibers. So if the vermiculite remains in place and you take every precaution not to move it, your health will not be affected. Health Canada still recommends that the vermiculite be removed from a company specializing in vermiculite decontamination if the vermiculite contains asbestos.