After a long period of time, how to choose between repairing and overall redoing the various types of building facades?

After long-term use, the choice between restoring the building's facade or fully redoing it is a complex decision-making process that requires consideration of multiple factors. Specific selection criteria will vary depending on factors such as the type of material, damage degree, budget, function and time of the building's facade. The following will be a detailed analysis of how to choose repair and comprehensive rework for facades of different materials after long-term use:

Facade of curtain wall (glass curtain wall, aluminum alloy curtain wall, etc.)
The situation of repairing and repairing:

Glass curtain wall: If there are slight scratches, stains, or cracks on the glass surface, or if the local sealant fails, repair is feasible. Cleaning, resealing, and replacing damaged glass units are usually sufficient to restore the functionality and appearance of the curtain wall.
Aluminum alloy curtain wall: If there is slight corrosion or paint peeling on the surface, it can be repainted or corroded parts can be replaced through local repair.

Overall redo situation:

Glass curtain wall: If the overall aging, discoloration, fading, sealing failure, or significant damage occurs to the glass, it is necessary to consider replacing it as a whole. Especially when the insulation and sound insulation performance of glass is poor, redoing the curtain wall may be a better choice.
Aluminum alloy curtain wall: If the metal frame is severely corroded, causing structural safety issues, or if the appearance seriously affects the building's image, it is recommended to replace it as a whole.

Brick and stone facade (such as clay bricks, natural stone)
The situation of repairing and repairing:

Brick and stone cracks: If there are only small cracks or detachment on the surface of the brick and stone, the cracks can be repaired and filled or local bricks can be replaced.
Surface pollution: For surface stains, mold spots, pollution, etc., cleaning and decontamination techniques can be used for treatment.

Overall redo situation:

Brick and stone detachment or structural looseness: If there is a large area of detachment on the exterior of the brick and stone, causing structural instability or wall water seepage, it is necessary to consider a complete redesign.
Severe aging: If the masonry material is severely aged, weathered, air dried, or even has large voids, corrosion, and other phenomena, and repair cannot effectively restore its performance, a complete redo is necessary.

Exterior paint (such as exterior wall paint, paint coating)
The situation of repairing and repairing:

Local detachment or peeling: If there is only local detachment, peeling or erosion on the surface of the coating, it can be repaired by re coating the local area.
Surface dirt: If the appearance of the coating surface is only affected by dirt, surface cleaning and wiping can be carried out to restore the original appearance.

Overall redo situation:

Serious paint fading: If the paint fades due to prolonged exposure to sunlight and cannot be restored to its original appearance through cleaning or partial repair, it may be necessary to repaint the entire exterior.
Multiple repairs: If there are multiple problems with the coating surface and local repairs are no longer effective, the entire exterior coating may need to be completely redone.

Aluminum plastic panel facade (such as aluminum-plastic composite panel)
The situation of repairing and repairing:

Minor damage: If there are small scratches, slight dents or damages on the surface of the aluminum-plastic panel, it can be treated by replacing the local aluminum-plastic panel or repairing the surface.
Surface contamination: If there are stains on the surface of aluminum-plastic panels, the appearance can be restored through cleaning and decontamination measures.

Overall redo situation:

Extensive damage: If the aluminum-plastic panel fades, is damaged, or deformed due to impact, repair may not be effective and a complete replacement should be considered.
Aging after long-term use: If the aluminum-plastic panel ages and loses its original luster on the surface, or even corrodes, fades, or loses strength, it is recommended to replace it as a whole.

Prefabricated concrete facade (such as precast concrete slab)
The situation of repairing and repairing:

Local cracks: If there are small cracks or slight detachment on the concrete facade, they can be repaired by grouting, repairing the cracks, or replacing small concrete slabs.
Surface cleaning: Surface stains, dirt, and mold can be removed through cleaning, decontamination, and other techniques.

Overall redo situation:

Severe aging or detachment: If the concrete facade shows extensive peeling, detachment, weathering, or local structural instability, repair cannot restore its performance and must be replaced as a whole.
Structural issues: If the structural damage to the concrete facade affects the stability of the building, it must be completely redone.