It can cost anywhere from $1,700 to $2,100 or between $1.50 and $3.50 per foot to insulate an attic depending on what insulation material you choose. Blown-in insulation is the least expensive option and ideal for older attics. Spray foam, while the most expensive, is best for noise reduction and new construction.

The Best Insulation Types for Your Home

Icynene foam insulation is blown in using water and contains no CFCs or formaldehyde once cured.

Air Krete cementitious foam is a nontoxic insulation that's sprayed into wall cavities.

Formaldehyde-free Johns Manville MR-Faced Batts (fiberglass) are treated with a food-grade preservative to protect against mold growth.

What is white mold? There are many species of mold found in homes that can have a white appearance, such as aspergillus, cladosporium, and penicillum. These molds may also have other colors present as well. Mold will very often appear white when it is first developing and later change color after producing spores.

Dangerous

All types of mold, including white mold can cause health problems. White mold should be removed as soon as possible to avoid health risks and structural damage. ... The symptoms induced by white mold include allergic reactions, respiratory infections, eye irritations, dizziness, nausea, headaches, and even depression.