Choosing the right insulation requires balancing R-factor, application method, and your specific project needs.
In short: General contractor Tom Silva explains the differences between fiberglass, spray foam, and cellulose insulation. This guide helps homeowners navigate the pros and cons of each material to ensure their home remains efficient and properly sealed.
When selecting insulation, homeowners must consider how each material performs. Fiberglass is readily available at home centers, but it must match specific wall thicknesses to avoid compression, which reduces its effectiveness. In contrast, spray foam offers superior air sealing; open-cell foam provides an air infiltration barrier with an R-factor comparable to fiberglass, while closed-cell foam delivers a higher R-factor per inch at a greater cost.
For retrofit projects, cellulose—manufactured from recycled newspaper and treated with borate for fire and insect resistance—can be dense-packed into stud bays. While fiberglass is often a DIY-friendly option, spray foam and blown-in cellulose typically require professional installation. Choosing the right material depends on the application, as costs vary significantly based on the product and the skill level required for proper installation.
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- Summary by Intellect · source: How to Choose the Right Insulation | Ask This Old House
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