What type of insulation should you use as part of your new renovation project? How much will it cost? As you’ll be able to see, the material and installation method involved will be an essential aspect when it comes to answering those questions and many others:


  • Blown-in insulation can offer an above average R-value through the use of a paper-like material known as white cellulose. However, the entire job will cost about $1,000-2,000 on average or still over $500 for DIY enthusiasts.
  • A reflective or radiant barrier offers a more affordable alternative that can work excellent in warmer climates. The cost per square foot is only a few cents, so the materials themselves can cost less than $400 for an average attic. A professional installation, however, will also require you to add at least an additional $500 to that cost.  For a more definite cost contact a San Jose roofing company with the experience you need.
  • Fiberglass batts are one of the least expensive of the insulation methods presented here. With large batts of fiberglass set to prevent air from penetrating through the exterior walls, you can get an average R-value while keeping the cost per square foot under $1.
  • Spray foam insulation is a simple and cheap method that costs about $1-$2 per square foot. Depending on the variety of liquid polyurethane used and the thickness of the foam, you can get an R-value of up to R6 with closed-cell foam.


Taking into account the price of each of these methods and the measurements of your home, you can easily determine how much the entire project will cost and make an informed decision regarding the type of insulation that is most suitable to your needs.