The principles of functional layer crosslam walling assembly
External insulation to CLT
The preferred location of insulation in the build-up of a wall section is on the outside of the CLT panel. There are several reasons why external insulation is preferred over internal insulation, the main ones are:
1 External insulation allows the insulation layer to be continuous around the structure, whereas internal insulation would be discontinuous where floors or interior walls intersect the external walls or roof. Continuity of insulation is important for reducing thermal bridging and improving energy performance.
2 External insulation provides a high level of decrement delay that protects the CLT structure and the air barrier system from temperature extremes. Apart from easing interior temperature management, the lack of extremes reduces expansion and contraction,
3 External insulation preserves the thermal mass capacity of the panels exposed to internal thermal conditions.
Panel with rigid insulation and timber cladding. U value = approx. 0.13
Panel with flexible insulation and timber cladding. U value = approx. 0.14
Panel with flexible insulation and lime render. U value = approx. 0.13
Panel with exposed inner face and flexible insulation. U value = approx. 0.13
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