does blown in insulation settle over time?

Yes, blown-in insulation can settle over time, which may reduce its effectiveness. This settling can occur due to factors like the weight of the material, moisture absorption, or simply the passage of time. Typically, cellulose insulation can settle by about 10-20% within the first year if not installed properly, while fiberglass insulation tends to hold its shape better.

To minimize settling, it's crucial to ensure that the insulation is installed correctly, with the right density and depth for your specific needs. If you notice areas where the insulation appears to have settled, it might be a good idea to add more insulation to maintain energy efficiency.

In terms of cost, blown-in insulation installation usually ranges from $1 to $3 per square foot, depending on your location and the type of insulation used. If you're considering adding or replacing insulation, I recommend getting 2-3 local quotes from licensed insulation professionals through Handyman.com to ensure you get the best quality and price for your project.

— Assisted answer