Make sure your attic has proper ventilation with the use of these WEATHERSHIELD insulation stops from Can-Cell. 
They work to keep blown materials in place to create a pathway between vents and improve airflow. 
The sturdy structure of the attic insulation stops help keep them in place. 
Bend the rafter baffle along pre-creased edges to the shape needed to facilitate installation. 
Perforations allow you to conform the stops to rafters for a precise fit. 
Coated on one side to boost waterproofing capabilities, the Hydroguard stops prevent damage from moisture, such as mould and deterioration. 
This attic ventilation baffle measures 24 in x 42 in each. 
Use these with blown-in insulation for residential projects or as spacing in concrete construction.