Thermal insulation in older buildings

In short: Older buildings often lose significantly more heat than new construction, which is why retrofitting insulation on the roof, facade, and windows can substantially cut heating costs. Not every insulation measure is equally sensible or easy to implement in every older building.

In more detail: Especially through uninsulated roofs and exterior walls, older buildings lose a lot of heat, since warm air rises and escapes through poorly insulated components.

In detail

• Roof insulation: Often the most cost-effective and impactful single measure, since a lot of heat is lost through the roof.
• Facade insulation: Exterior insulation greatly improves thermal protection but usually requires scaffolding and is correspondingly more involved.
• Window replacement: Modern multi-pane glazing significantly reduces heat loss but should be combined with a thoughtful ventilation strategy.
• Interior insulation as an alternative: For heritage-protected facades, interior insulation allows improvement without altering the exterior appearance.
• Moisture management: Incorrectly installed insulation can promote moisture problems and mold growth, so expert planning is important.
• Funding programs: Government subsidies often financially support energy-efficient renovations, making insulation measures more economical (heizkostenverordnung-und-verbrauchsabrechnung).
• Order of measures: An energy assessment before renovation helps set priorities and combine measures sensibly (fenster-und-tueren-abdichten).