Turn off power to the wall area and remove outlet covers, switch plates, and any trim blocking access
Inspect the wall cavity for wiring, plumbing, moisture, mold, or damage
Choose the correct insulation type and R-value for the wall
Measure the wall cavities
Cut insulation batts or rolls to fit snugly, if using batt insulation
Insert insulation into each cavity without compressing it
Split batts around wires, pipes, and other obstructions
Fill gaps and corners completely
Use a vapor barrier if required by local code and climate
Secure the insulation if needed with staples, supports, or netting
For blown-in insulation, drill access holes at the required locations
Insert the blower hose and fill each cavity to the proper density
Patch drilled holes after blown-in installation
Reinstall outlet covers, switch plates, and trim
Check for missed spots, gaps, or compressed areas
Dispose of scraps and clean the work area