Is blown-in insulation safe for older South Jersey homes?
Short Answer
Yes. Blown-in fiberglass is non-combustible, non-toxic, and safe for homes of any age. For older homes, we inspect for knob-and-tube wiring, vermiculite, and other legacy concerns before installation, and address them appropriately.
Detailed Explanation
Many South Jersey homes in historic communities like Haddonfield, Collingswood, Burlington, and Cape May were built decades ago, and homeowners often ask whether modern insulation is safe for their older homes. The answer is yes — blown-in fiberglass insulation is one of the safest insulation materials available. It's non-combustible (it won't burn or contribute to a fire), non-toxic (it doesn't off-gas or release harmful chemicals), non-corrosive (it won't damage pipes or wiring it contacts), and does not absorb moisture (it won't support mold growth). However, older homes do require some additional precautions that we check for during inspection: Knob-and-tube wiring — homes built before 1950 may have this early electrical system. Insulation should not cover knob-and-tube wiring because it can trap heat and create a fire hazard. If we find knob-and-tube wiring, we recommend having it evaluated by a licensed electrician before insulation is installed. Vermiculite insulation — some older attics contain vermiculite, which in rare cases may contain asbestos. If we find vermiculite during inspection, we recommend professional testing before proceeding. If asbestos is present, specialized abatement is required before new insulation can be added. Existing moisture or roof leaks — any active leaks or moisture problems should be repaired before insulation is installed. Insulation over wet or damaged decking will trap moisture and worsen the problem. We inspect for all of these conditions during the free attic assessment and address them before proceeding. For the vast majority of older South Jersey homes, blown-in fiberglass insulation is completely safe and delivers the same energy savings and comfort benefits as in newer homes.
Why It Matters
Older South Jersey homes benefit most from insulation upgrades, but they require proper inspection first. Knowing what to look for ensures the installation is safe and effective.
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