| 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 |