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Other stories by Mason Knowles

  • Troubleshooting Spray-Foam Insulation

    A lot can go wrong with a two-part plastic insulation that is essentially manufactured on the job site as it’s being applied. Here’s what to look out for.

  • How Safe is Spray-Foam Insulation?

    Q: I've heard that polyurethane spray-foam insulation may contain penta-BDE, a chemical that is called a "toxic flame retardant" by the EPA and has been banned in some states. How much of a risk does this chemical cause for the installer and the homeowner, and are there alternatives?