Inspect before covering
Find roof or plumbing leaks, bulk-water entry, pest damage, unsafe wiring and existing ventilation issues before adding insulation.
Record current material, condition, coverage and the assemblies included in the proposal.
Pair insulation with air sealing
Insulation slows heat flow; air sealing controls unintended leakage. A proposal should identify the penetrations and boundaries being treated.
Combustion safety and ventilation may need review when a home becomes tighter.
Verify the finished work
Require material, area, installed R-value target, depth or density requirements, photographs and a final inspection method.
After major envelope work, revisit HVAC loads before replacing equipment.
How this guide was produced
CoolCompare Editorial reviewed 2 linked evidence sources and separated source facts from homeowner checks, calculations and limitations. This page does not claim hands-on product testing, professional inspection or address-specific verification unless the article explicitly documents it.
Reviewed 5 August 2026. See the editorial policy, fact-checking standard and corrections process.
Sources and further reading
Questions or corrections? Contact the editorial team.
