Installing roof insulation is a crucial step in improving your home's energy efficiency and comfort. Here's a general guide to help you get started:  

1. Gather Your Supplies

Insulation: Choose the right type and R-value for your climate and budget (fiberglass batts, spray foam, etc.).
Safety Gear: Wear gloves, safety glasses, and a dust mask to protect yourself.  
Tools: Utility knife, measuring tape, staple gun (for batts), ladder, work gloves, safety glasses, dust mask.
2. Prepare the Roof Space

Clear the Area: Remove any existing insulation, debris, and obstructions from the attic.
Inspect the Roof: Check for any leaks, damage, or signs of pests before installing insulation.  
3. Measure and Plan

Determine the Area: Measure the length and width of the roof space to calculate the square footage.
Calculate Insulation Needs: Determine the amount of insulation needed based on the R-value and the size of the area.
4. Install the Insulation

Fiberglass Batts:
Unroll the batts and fit them snugly between the rafters.
Cut batts to size as needed using a utility knife.  
Staple the batts to the rafters to secure them in place.
Spray Foam:
Apply the foam evenly using a spray gun.
Allow the foam to expand and cure completely.
Rigid Foam Boards:
Cut the boards to size and fit them between the rafters.
Secure the boards in place using adhesive or mechanical fasteners.
5. Install a Vapor Barrier (if applicable)

Purpose: Prevents moisture from entering the insulation and causing damage.
Installation: Install a vapor barrier sheet over the insulation, ensuring it's properly sealed and overlapped.
6. Inspect and Finish

Check for Gaps: Ensure there are no gaps or air leaks in the insulation.
Finalize: Once the insulation is in place, finish any remaining tasks, such as sealing any remaining gaps and cleaning up the work area. Visit https://perthinsulationcentre.com.au/collections/roof-insulation

Important Notes:

Safety First: Always prioritize safety. Wear appropriate safety gear and work carefully.
Professional Installation: For complex installations or if you're uncomfortable with DIY, consider hiring a professional insulation contractor.
Building Codes: Ensure your insulation installation complies with local building codes and regulations.
Ventilation: Adequate attic ventilation is crucial for proper insulation performance.  
This is a general guide. Always refer to the manufacturer's instructions for specific installation details and consult with a qualified professional for any questions or concerns.