We all know that home insulation saves money on energy bills, but installing it in the wrong places can cost you thousands in damage repairs. Here are some of the areas where simply adding insulation can do more harm than good, and what to do instead.
Basements and underfloor crawl spaces
Basements and crawl spaces naturally accumulate moisture. Adding insulation traps this moisture, leading to mould and rot issues. Fix any dampness first by sealing cracks and improving drainage and ventilation. Then install a moisture barrier before adding insulation.
Old walls without damp protection
Older homes in particular can lack proper damp proofing. Installing insulation onto old walls or within old cavities can trap moisture inside the wall, causing peeling paint and structural damage. Check for existing moisture problems and fix them first. Consider having a damp proof course installed by professionals.
Around electrical components
Covering wires, electrical boxes, or recessed lights with insulation can cause overheating and fires. Keep insulation away from all electrical components. Use special protective covers for recessed lights that allow airflow while maintaining efficiency.
Too close to water pipes
Insulating around pipes can hide leaks, leading to undetected water damage and mould. Insulate the pipes themselves, but keep surrounding areas accessible for inspections and repairs.
Poorly ventilated attics
Without proper airflow, moisture from your home rises and gets trapped, causing wood rot and reducing the effectiveness of insulation.
Ensure your attic has adequate ventilation before insulating. Never block existing vents, and seal air leaks from the house below. We have previously discussed the pitfalls of spray foam insulation.
Near chimneys and heating vents
Insulation too close to heat sources can catch fire and block important airflow.
Keep insulation at least 5mm away from chimneys, flues, and heating vents. Use fire-resistant materials in these areas.
Other areas
Bathrooms: You can insulate bathrooms, but use moisture-resistant materials and ensure good ventilation.
DIY vs Professional: Basic attic insulation is often DIY-friendly, but hire professionals for complex areas like walls or anywhere near utilities.
Good insulation is about smart placement, not just coverage. When in doubt, consult a professional; it’s cheaper than fixing expensive damage later. Focus on safe, effective insulation that protects both your home and your budget.