The cellulose trade group recommends hiring a professional, but if there isn’t a qualified installer in your area or you feel comfortable taking on the job, you may be able to find guidance from manufacturers. Do-it-yourself instructions are available from the fiberglass and mineral wool trade group. If you choose to install the insulation yourself, follow the manufacturer’s instructions and safety precautions carefully and check local building and fire codes. To evaluate sprayed or blown-in types of insulation, measure the depth of the insulation and check for gaps in coverage. In addition, inspect insulation for a tight fit around building components that penetrate the insulation, such as electrical boxes. To evaluate blanket installation, you can measure batt thickness and check for gaps between batts as well as between batts and framing.

Ask contractors about their air-sealing services and costs as well, because it’s a good idea to seal air leaks before installing insulation.

The application can significantly impact the insulation’s performance.

Ask contractors about their experience in installing the product you are considering.Obtain written cost estimates from several contractors for the R-value you need, and don't be surprised if quoted prices for a given R-value installation vary by more than a factor of two.When hiring a professional certified installer: Other types require professional installation. (Liquid foam insulation materials can be poured, but they require professional installation). Homeowners can install some types of insulation - notably blankets, boards, and materials that can be poured in place. The maximum thermal performance or R-value of insulation is very dependent on proper installation.

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