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Thermal Insulation in Historic Buildings: How to Intervene Without Altering the Aesthetics

Published on March 25, 2026
Thermal Insulation in Historic Buildings: How to Intervene Without Altering the Aesthetics

Italy has the largest architectural and historical heritage in the world. Millions of buildings constructed before 1970 need energy efficiency work, but architectural and landscape constraints make it impossible to use traditional insulation systems.

The Challenge of Protected Buildings

Historic buildings have specific constraints that make any intervention complex:

  • Heritage authority constraints: impossibility of altering the external appearance
  • Decorations and moldings: architectural elements that cannot be covered
  • Limited thickness: impossibility of adding centimeters to the facade
  • Original materials: need to preserve historic plaster and stones

Why Traditional Coats Are Not Suitable

The traditional external insulation system (ETICS) involves applying insulating panels 8-14 cm thick to the external facade. This approach:

  • Completely alters the appearance of the building
  • Covers decorations, cornices and architectural details
  • Cannot be authorized by the heritage authority
  • Changes the dimensional proportions of windows and doors

The Nanotechnological Solution

i-GlooKlima is the ideal solution for historic buildings thanks to its unique characteristics:

  • Thickness of just 2-10 mm: practically invisible, it does not alter proportions
  • Application on any surface: stone, brick, historic plaster
  • High breathability: the masonry continues to "breathe", avoiding moisture buildup
  • Customizable finishes: over 300 colors available to respect the original aesthetics

The L. Barbiero Case, Verona

A concrete example is the intervention carried out for Mr. Barbiero in the province of Verona. The building had walls with detached paint and exposed brick jambs to be treated with the utmost care. The application of iGK2 on the walls and iGK1 on the bricks allowed a complete aesthetic renovation with a significant improvement in energy performance, all without altering the original character of the building.

Regulatory Compliance

i-GlooKlima products are CE and CAM certified, and their application is fully compliant with current regulations on interventions on protected buildings. Our technical team can support you in preparing the documentation needed to obtain the authorizations.

Do you have a historic building to renovate? Contact us for specialized advice.