When installing loose fill insulation it is recommended:

To achieve the desired R-value, you must install at least the number of bags required by the label to at least the minimum thickness required by the bag label. To ensure the minimum insulation thickness, the International Energy Conservation Code (IECC) requires that rulers be attached in each 300 sq. ft. area of the attic to use as gauges during installation.

Make sure the machine is set in accordance with instructions on the bag. (Settings may vary depending on the machine condition, climatic factors and application techniques.) The machine settings were developed by manufacturers using machines in good working order and application techniques considered to be acceptable in normal field operation. It may be necessary to make some adjustments to these initial settings to fine tune the performance of the equipment.

When blowing, keep the hose level, and install with a minimum of hand deflection. Always blow with, not across, the joists.

Section the attic into quarters and make sure one-quarter of the specified number of bags is used in each section to achieve the desired R-value.