Thermal insulation cannot be described by one board alone. It controls heat transfer through the envelope and helps stabilise indoor conditions. Winter heat loss, summer heat gain, air leakage, solar exposure and moisture need to be considered together. Instead of asking only how thick a wall is, ask how its layers and junctions work together in your climate.
Walls and roofs are layered systems
Cladding, water management, insulation, air control, structure and interior finish serve different functions. A product being non-combustible, water-resistant or insulating does not establish the performance of the entire wall. Distinguish product properties from the behaviour of the assembled system. Roof and floor also form the thermal enclosure. The section diagram explains functions, not a prescribed product sequence or installation thickness.
Thermal bridges and air leaks are different
A thermal bridge is a local area through which heat passes more readily than through surrounding construction. Structural members and discontinuities need attention for this reason. Air leakage is air movement through gaps, requiring separate treatment at windows and service penetrations. Sealing a gap does not solve every thermal bridge, and extra insulation does not automatically eliminate air leaks. Ask about junction drawings and site checks together.
Assess the whole window, not only the glass
Glazing, frame, sash, seals and installation junction work together. Check whether a stated value describes the glazing alone or the complete window. Orientation, shading and solar gain also matter with large glazed areas. Do not assume one specification is suitable for every elevation. Plan operable windows alongside safe use, cleaning access and ventilation needs.
Moisture and condensation: avoid arbitrary layers
Moisture can enter through rain, the ground, air movement or vapour transfer. Condensation may occur at cold surfaces or within an assembly. Adding an internal film is not a universal solution: climate, indoor use, airtightness, drying paths and ventilation must be assessed together. Painting a stain without finding the moisture source does not solve the problem. Have the assembly reviewed by the designer and installation checked against product instructions.
Consider climate and acoustic comfort separately
The Ministry’s announcement of 1 April 2025 describes insulation projects and reporting under TS 825. Confirm current project requirements with the design team; this guide does not recommend one insulation thickness for all of Türkiye. Thermal and acoustic insulation are different assessments. Acoustic performance also depends on the complete wall, junctions, doors, service paths and adjacent spaces. A thermal product declaration is not evidence of acoustic performance.
Insulation questions for a quotation
- Are wall, roof and floor build-ups defined?
- What documents support window performance and installation?
- Are thermal bridging and air leakage addressed separately?
- Are climate, moisture and ventilation assessed together?
- Is acoustic comfort included as a separate requirement?
SOURCES & SCOPE
The basis and limits of this guidance.
The following sources support the topics noted. This text is not a product specification, quotation, engineering approval or legal opinion. Permissions, current technical requirements and construction details require project-specific confirmation.
- Ministry — announcement on TS 825 implementation (new tab)
Announcement of 1 April 2025 concerning insulation projects and reporting; this guide does not prescribe numerical design values.
- US Department of Energy — air sealing at window openings (new tab)
Building-science background, not Turkish regulation or a MEVA product certificate.
- US Department of Energy — moisture flow in building enclosures (new tab)
Principles of moisture, drainage and climate-specific detailing; not a dimensioned construction specification.
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