Replace

Add-in

Wrap-it

Add-on

Cover-it

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Approach

Remove the old envelope elements and replace with new one

Add new elements or materials inside envelope system

Wrap with the second façade, element with new material

Add new elements or materials on outside envelope system

Partially or fully covered courtyard or atrium

Example

Remove entire old envelope or individual elements, replace with new one

Internal thermal insulation;

Box window

External insulation;

Wrap the balcony with cladding layer;

Second floor facade

Expand space;

Additional stairs;

New balcony

Partially or fully cover heated or unheated space

Advantage

Better performance;

Eliminate the physical problems

Sufficient data support;

Increase the thermal resistance

Solve thermal bridge Increase thermal resistance;

New outer wraps;

Little interference

New function

Higher performance;

Additional space

Establish thermal buffer;

Improve natural ventilation;

Additional space

Limitation

Great impact on occupant;

Higher costs

Thermal bridge; Disturbance to indoor environment and occupant

Facade changes

Need to combine with other strategies;

Structural constraints

Layout and function restrictions;

Overheating risk