Chapter 20

Design Application and Aesthetic Expression: From Changing Clothes to Reshaping

Compiled by Guangdong Fortune Stone New Material Co., Ltd.

Key Points

• Facade retrofit design needs to accomplish three transformations: from material thinking to system thinking, from surface beautification to value reshaping, and from single material to system combination.
• The five design approaches of flexible stone in facade retrofit are: renewal, accentuation, restoration, contrast, and integration. The choice of approach depends on the building condition and design objectives, and corresponds to four design theories.
• The color system and texture system are the foundation of flexible stone aesthetic expression; joint design and node design are the key control points of facade effect.
• The five common misconceptions of facade retrofit design correspond to five balance principles. The core of design decision-making is to find freedom within constraints and to seek innovation within inheritance.

I. Design Aesthetics Theory: The Unity of Function and Aesthetics

Design aesthetics theory holds that design is the unity of function and aesthetics. Good design not only meets functional needs but also satisfies aesthetic needs. Function is “practicality”; aesthetics is “pleasure.” The unity of both is what makes good design.

In facade retrofit projects, the design application of flexible stone needs to achieve the unity of function and aesthetics: functional dimension—safety, durability, waterproofing, fire protection, easy maintenance; aesthetic dimension—color, texture, joints, nodes, overall effect.

Table 20-1 Functional and Aesthetic Dimensions of Flexible Stone Design

II. Genius Loci Theory: Continuing Historical Context

Genius loci theory, proposed by Norberg-Schulz, holds that every place has its unique spiritual character, and design should respect and continue this spiritual character.

In facade retrofit projects, genius loci theory requires design to respect the building’s historical context, surrounding environment, and community memory: historical context—the building’s historical style, materials, colors, textures; surrounding environment—the style of surrounding buildings, district character, urban fabric; community memory—residents’ emotional identification with the building, collective memory.

Table 20-2 The Three Dimensions of Genius Loci

III. Color Psychology: The Emotional Expression of Color

Color psychology holds that color not only affects visual perception but also affects emotions and psychology. Different colors trigger different psychological responses: warm colors—warmth, friendliness, vitality; cool colors—calmness, modernity, tranquility; neutral colors—simplicity, cleanliness, stability.

In facade retrofit design, color selection needs to consider building temperament, surrounding environment, and functional needs: building temperament—stable or lively? Traditional or modern? Surrounding environment—coordination or contrast? Functional needs—residential or commercial?

Table 20-3 Psychological Effects and Applicable Scenarios of Color

IV. Gestalt Theory: The Relationship Between Whole and Part

Gestalt theory holds that the whole is greater than the sum of its parts. When perceiving things, people do not first perceive parts and then combine them into a whole, but first perceive the whole and then focus on the parts.

In facade retrofit design, Gestalt theory requires design to focus on overall sense and layering: overall sense—unified facade effect, not messy; layering—forming layers through joints, textures, and color contrast.

Table 20-4 Application of Gestalt Theory in Facade Retrofit Design

20.1 The “Three Transformations” of Facade Retrofit Design

In facade retrofit projects, the design application of flexible stone needs to achieve three transformations.

20.1.1 Transformation One: From Material Thinking to System Thinking

Traditional design first selects materials, then thinks about how to use them. Facade retrofit design should first think about problems, then select materials. What are the problems of facade retrofit projects? Old walls damaged, water seepage, outdated appearance, insufficient function. The first step of design is not to select materials, but to define problems.

Table 20-5 Comparison of Material Thinking and System Thinking

20.1.2 Transformation Two: From Surface Beautification to Value Reshaping

Traditional facade retrofit design is surface beautification—painting the old wall white, applying new tiles, making the building look newer. The complete logic of facade retrofit design is value reshaping—through design, letting old buildings regain vitality and enhancing the building’s functional value, aesthetic value, and economic value.

Table 20-6 Comparison of Surface Beautification and Value Reshaping

20.1.3 Transformation Three: From Single Material to System Combination

Traditional design is one material for everything—either all ceramic tiles or all coatings. Facade retrofit design should be system combination—flexible stone combined with coatings, metal, stone, and other materials to achieve richer design expression.

Table 20-7 Comparison of Single Material and System Combination

A practical case of “objective first”:

A client requested “just design something casually, just change the color.” The editorial team suggested that the client first clarify what problems this building needs to solve and what effect to achieve before producing a scheme. After communication, the client confirmed the goal was “make the building look newer and more upscale, and coordinate with the adjacent commercial complex.” Based on this, the design conditions were clarified, and the scheme direction was determined accordingly. If the design objective is unclear, the scheme lacks a basis.

This case shows that design fears vague objectives the most. If objectives are unclear, what follows is repeated modification. Setting objectives first, then producing schemes, is the basic procedure of design work.

20.2 The “Five Design Approaches” of Flexible Stone in Facade Retrofit

Based on facade retrofit project practice, flexible stone can be summarized into five design approaches in facade retrofit: renewal approach, accentuation approach, restoration approach, contrast approach, and integration approach.

20.2.1 Approach One: Renewal Approach—Overall Renewal

Applicable scenarios: building appearance old, damaged, dim in color, requiring overall renewal.

Design logic: Use flexible stone to cover the old wall overall, selecting bright, modern colors and textures to make the building look completely new.

Design points: color selection—determine the main tone and auxiliary colors according to building style and surrounding environment; texture selection—select stone-imitation, brick-imitation, wood-imitation textures according to building temperament; joint design—simulate the splicing effect of stone and brick walls through joints to increase facade layering.

Table 20-8 Design Points of the Renewal Approach

A practical case of the “renewal approach”:

A residential building facade retrofit project from the 1990s had gray washed stone exterior walls that were old and dim. Design idea: overall coverage with light beige stone-imitation texture flexible stone, simulating the dry-hanging stone effect through joint design. After renovation, the entire building looked completely new and coordinated with surrounding new buildings. Residents reported that after renovation it was no different from new buildings, and the beige stone-imitation texture was durable and not easily outdated.

20.2.2 Approach Two: Accentuation Approach—Key Enhancement

Applicable scenarios: building overall condition is acceptable, but local damage and facade monotony require accentuation and enhancement.

Design logic: Use flexible stone for accentuation at key parts of the building—entrances, eaves, window walls, balconies—to enhance facade layering.

Design points: key parts—select visual focal points such as entrance canopies, eave lines, window walls; color contrast—use contrasting or adjacent colors to form layers with the main wall; texture contrast—use different textures to form tactile contrast with the main wall.

Table 20-9 Design Points of the Accentuation Approach

A practical case of the “accentuation approach”:

An office building facade retrofit project from the 2000s had light gray coating exterior walls; the overall condition was acceptable, but the facade was monotonous. Design idea: retain coatings on the main wall, and use dark gray stone-imitation flexible stone for accentuation at entrance canopies, eave lines, and window walls. After renovation, the facade layering significantly improved, and the building temperament shifted from plain to refined. This case shows that design is not about addition, but about the right addition; only when the accentuation position and quantity are appropriate can temperament be enhanced.

20.2.3 Approach Three: Restoration Approach—Repairing the Old as Old

Applicable scenarios: historic buildings, character protection area buildings requiring preservation of original appearance, but exterior walls severely damaged.

Design logic: Use flexible stone to simulate the color and texture of the original facing, repair damaged parts, and maintain the building’s historical appearance.

Design points: character research—first research the building’s historical appearance to determine the original color, texture, and joints; customized texture—customize flexible stone color and texture based on research results, as close to the original as possible; zoned restoration—overall coverage for severely damaged areas, local repair for lightly damaged areas.

Table 20-10 Design Points of the Restoration Approach

A practical case of the “restoration approach”:

A historic district facade retrofit project involved Republican-era arcade buildings with washed stone facing on exterior walls, partially damaged. Design idea: customize washed stone texture flexible stone with color and texture close to the original, covering damaged walls overall. After renovation, the arcade buildings restored their historical appearance and coordinated with surrounding historic buildings. The cultural relics department accepted that the restoration both solved the damage problem and preserved the historical appearance. The core of repairing the old as old is not making old, but restoring; restoring historical appearance is respect for historic buildings.

20.2.4 Approach Four: Contrast Approach—Dialogue Between Old and New

Applicable scenarios: buildings with old and new parts, or buildings surrounded by new and old buildings, requiring a dialogue between old and new.

Design logic: Use the modern texture of flexible stone to contrast with the original texture of old buildings, creating a design effect of dialogue between old and new.

Design points: contrast parts—select building additions and new construction parts, using flexible stone for modern treatment; color contrast—use modern colors to contrast with the original colors of old buildings; texture contrast—use modern textures to contrast with the original textures of old buildings.

Table 20-11 Design Points of the Contrast Approach

A practical case of the “contrast approach”:

An old factory renovation project had red brick walls and was converted into a creative park. Design idea: retain the original texture of the red brick walls, and use dark gray flexible stone for modern treatment at entrances, window openings, and eaves, forming a dialogue between old and new. After renovation, the old factory retained industrial memory while possessing a modern atmosphere. The park operator commented that this design gave the old factory new vitality. The dialogue between old and new is not conflict, but symbiosis: preserving memory while injecting new life.

20.2.5 Approach Five: Integration Approach—Unified Appearance

Applicable scenarios: building groups or districts with inconsistent styles and messy colors among buildings, requiring unified appearance.

Design logic: Use unified colors and textures of flexible stone to cover building group exterior walls, forming a unified appearance.

Design points: color unity—select a unified color system, with slight variations among buildings within unity; texture unity—select a unified texture system, with slight differences among buildings within unity; joint unity—select a unified joint system, with slight adjustments among buildings within unity.

Table 20-12 Design Points of the Integration Approach

A practical case of the “integration approach”:

An old residential community comprehensive improvement project had 8 residential buildings with different exterior wall colors and materials, and a messy appearance. Design idea: uniformly adopt light warm gray stone-imitation texture flexible stone, with slight differences in joint design for each building, forming an appearance of variation within unity. After renovation, the overall sense of the community appearance significantly improved, and residents reported that the community finally had a sense of unity. Unified appearance is not uniformity, but harmony in diversity; unity with variation is a feasible design path.

Theoretical mapping: The correspondence between the five design approaches and four theories

The five design approaches respectively correspond to the core viewpoints of four theories. The renewal approach corresponds to the unity of function and aesthetics in design aesthetics theory—achieving unity of functional and aesthetic improvement through overall coverage. The accentuation approach corresponds to the overall sense and layering in Gestalt theory—forming visual layers within overall unity through accentuation at key parts. The restoration approach corresponds to the continuation of historical context in genius loci theory—preserving the building’s historical appearance and community memory through customized antique textures. The contrast approach corresponds to form follows function in design aesthetics theory—forming a dialogue between building and era through old-new contrast. The integration approach corresponds to the whole is greater than the sum of parts in Gestalt theory—integrating messy building groups into a unified appearance through unified color and texture.

This correspondence indicates that the five design approaches are not isolated design techniques, but concrete applications of the four theories in facade retrofit design. When using the five design approaches, readers should make comprehensive judgments in combination with the core viewpoints of the four theories.

20.3 The Color and Texture Systems of Flexible Stone

20.3.1 Color System

The color system of flexible stone can be divided into six series:

Warm color series—beige, light coffee, warm gray, suitable for residential, schools, hospitals, and other buildings, giving a warm and friendly feeling.

Cool color series—light gray, dark gray, blue-gray, suitable for office buildings, commercial complexes, industrial buildings, giving a calm and modern feeling.

Neutral color series—white, light gray, medium gray, suitable for all building types, giving a simple and clean feeling.

Stone-imitation color series—imitation granite, imitation limestone, imitation sandstone, suitable for high-end buildings, giving a stable and upscale feeling.

Brick-imitation color series—imitation red brick, imitation blue brick, imitation terracotta brick, suitable for historic buildings, cultural buildings, giving a traditional cultural feeling.

Wood-imitation color series—imitation wood grain, imitation wood color, suitable for B&Bs, resort buildings, giving a natural and warm feeling.

Table 20-13 Flexible Stone Color System

In terms of color durability, the enterprise’s independently developed inorganic silicone resin modified acrylic emulsion technology, through chemical bonding, copolymerizes inorganic silicone resin with acrylate monomers, achieving topcoat stain resistance whiteness recovery rate of over 80% and weather resistance of 3500h. This technology enables flexible stone colors to remain stable during long-term use, reducing fading and discoloration risks caused by ultraviolet radiation and pollution erosion, providing durability assurance for the application of this chapter’s color system.

A practical suggestion for “color selection”:

The basic sequence of color selection is: first look at building temperament—stable or lively, traditional or modern; then look at surrounding environment—coordination or contrast; finally look at functional needs—residential or commercial. After all three dimensions are clear, color selection has a basis. Buildings are spatial carriers; color is an expression means; means must serve the carrier.

20.3.2 Texture System

The texture system of flexible stone can be divided into five series:

Stone-imitation texture—simulating the texture and tactile quality of natural stone, including imitation granite, imitation limestone, imitation sandstone, suitable for high-end buildings, commercial complexes, office buildings.

Brick-imitation texture—simulating the texture and tactile quality of brick walls, including imitation red brick, imitation blue brick, imitation terracotta brick, suitable for historic buildings, cultural buildings, residential buildings.

Wood-imitation texture—simulating the texture and tactile quality of wood, including imitation wood grain, imitation wood color, suitable for B&Bs, resort buildings, landscape buildings.

Solid color texture—no texture or micro-texture, simple and clean surface, suitable for modern buildings, minimalist styles.

Artistic texture—customized texture, customizing color and tactile quality according to design needs, suitable for landmark buildings, artistic buildings.

Table 20-14 Flexible Stone Texture System

A practical suggestion for “texture selection”:

The basic logic of texture selection is: first look at building style—modern style selects solid color or stone-imitation, traditional style selects brick-imitation or wood-imitation; then look at building function—commercial complexes select stone-imitation for high-end feel, residential buildings select brick-imitation for warmth; finally look at design intent—what you want to express, choose the corresponding texture. Taking stone-imitation texture as an example, its effect is spiritual resemblance rather than formal resemblance: texture close to stone, but lighter, thinner, and safer. From a distance it looks like stone; up close it is flexible stone tactile quality—this is the engineering value of stone-imitation texture.

20.4 The “Joint Design” of Flexible Stone in Facade Retrofit

Joint design is one of the key control points of flexible stone facade effect. Joints not only affect aesthetics but also affect the material’s expansion performance.

20.4.1 The Role of Joints

Aesthetic role—simulating the splicing effect of stone and brick walls through joints, increasing facade layering.

Functional role—releasing the material’s temperature stress through joints, preventing material cracking due to thermal expansion and contraction.

Construction role—dividing construction areas through joints, facilitating construction and quality control.

Table 20-15 The Three Roles of Joints

20.4.2 Joint Specifications

Joint specifications need to be determined according to building dimensions, flexible stone specifications, and design effect:

Joint width—usually 8–15 mm, determined by design effect and building dimensions.

Joint spacing—usually 600–1200 mm, determined by flexible stone specifications and design effect.

Joint form—flat joints, concave joints, convex joints, etc., determined by design effect.

Table 20-16 Joint Specification Design

A practical case of “joint design”:

An office building facade retrofit project had a design effect of imitation dry-hanging stone. Joint design: width 10 mm, spacing 800 mm, form concave joint. After renovation, the facade effect was close to dry-hanging stone, but the cost was far lower than stone. Joint design is the key control point for flexible stone’s stone-imitation effect; once joint parameters are determined, the stone-imitation effect has an order foundation.

20.4.3 Joint Construction Points

Key points of joint construction:

Line snapping—before construction, snap lines and position according to joint design to ensure accurate joint positions.

Joint filling—embed special joint filler strips or sealant at joints to ensure joint effect and waterproofing performance.

Cleaning—after construction, clean residue at joints to ensure joints are clean and tidy.

Table 20-17 Joint Construction Points

A site problem of “non-standard joint construction”:

A project had non-standard joint construction—inaccurate line snapping, uneven joint filling, and incomplete cleaning. The facade effect was obviously damaged, joints were not straight, and the client refused acceptance. After rework, line snapping, joint filling, and cleaning were redone, and the effect was restored. This case shows that joints are fine processes; if fine process control is not in place, the overall effect is immediately damaged.

20.5 The “Node Design” of Flexible Stone in Facade Retrofit

Node design is the detail control link of facade retrofit design, directly affecting facade completion.

20.5.1 Eave Node

The eave is the top finishing part of the building, directly determining the building facade’s spiritual appearance.

Design points: the eave part is wrapped with flexible stone, with color coordinated or contrasting with the main wall; a drip line is set at the bottom of the eave to prevent rainwater from flowing down the wall; the junction between the eave and the roof is waterproofed.

Table 20-18 Eave Node Design Points

A practical case of “eave design”:

A residential building facade retrofit project had severely damaged original eaves. Design idea: wrap the eave with dark gray flexible stone, contrasting with the light beige main wall, and set a drip line at the bottom of the eave. After renovation, the eave became one of the facade visual focal points, and the building’s overall image was enhanced. When the eave is finished well, the building’s spirit stands.

20.5.2 Window Wall Node

Window walls are the rhythmic elements of the building facade; when designed properly, the facade has a sense of rhythm.

Design points: window walls are accentuated with flexible stone, contrasting with the main wall; texture selection forms tactile contrast with the main wall; joint design forms rhythmic variation with the main wall.

Table 20-19 Window Wall Node Design Points

A practical case of “window wall design”:

An office building facade retrofit project had a monotonous facade. Design idea: accentuate window walls with dark gray stone-imitation flexible stone, contrasting with the light gray main wall, and joint design forms rhythmic variation with the main wall. After renovation, the facade had a sense of rhythm and was no longer monotonous. The rhythmic design of window walls is the key means for the facade to move from plain to ordered.

20.5.3 Entrance Node

The entrance is the face of the building; when designed properly, the building has a sense of ceremony.

Design points: the entrance part is treated as a focal point with flexible stone, with color contrasting with the main wall; texture selection forms tactile contrast with the main wall; joint design forms layering variation with the main wall.

Table 20-20 Entrance Node Design Points

A practical case of “entrance design”:

A commercial complex facade retrofit project had an inconspicuous entrance. Design idea: treat the entrance canopy as a focal point with dark stone-imitation flexible stone, forming a strong contrast with the light-colored main wall, and joint design forms layering variation with the main wall. After renovation, the entrance became a facade focal point, and the commercial complex’s image was enhanced. The entrance is the building’s face; when the face is treated well, the building’s overall recognizability increases.

Theoretical mapping: The correspondence between joint and node design and Gestalt theory

Joint design and node design correspond closely with Gestalt theory. Joint design corresponds to the overall sense and layering in Gestalt theory—simulating the splicing effect of stone and brick walls through joints, forming visual layers within overall unity; the width, spacing, and form design of joints follow the principle that the whole is greater than the sum of parts, making the facade effect coordinated and unified. The eave node corresponds to simplicity in Gestalt theory—the eave, as the building’s finishing part, should not be overly complex in design, but should be concise and powerful, forming a visual focal point. The window wall node corresponds to layering in Gestalt theory—window walls, as rhythmic elements of the facade, form visual rhythm through color, texture, and joint contrast. The entrance node corresponds to the unity of overall sense and layering in Gestalt theory—the entrance forms a visual focal point through focal treatment while maintaining overall coordination with the main wall.

This correspondence indicates that joint and node design are not isolated construction techniques, but concrete applications of Gestalt theory in facade retrofit design.

20.6 The “Five Common Misconceptions” of Facade Retrofit Design

There are five common misconceptions in facade retrofit design that need to be avoided in design decision-making.

20.6.1 Blindly Pursuing “New”

Some clients believe that facade retrofit means being new, so they choose the brightest colors and the most modern styles. As a result, after renovation, the building is out of place with the surrounding environment and appears abrupt.

Correct approach: Find a balance between “new” and “coordination.” Buildings are part of the city and cannot be separated from the environment.

Table 20-21 Misconception of Blindly Pursuing New and Countermeasures

20.6.2 Blindly Pursuing “Expensive”

Some clients believe that expensive materials are good, so they choose high-priced materials such as stone and aluminum panels. As a result, costs overrun, and the effect is not necessarily good.

Correct approach: Find a balance between “effect” and “cost.” Flexible stone’s stone-imitation effect can achieve the visual effect of stone, but the cost is far lower than stone.

Table 20-22 Misconception of Blindly Pursuing Expensive and Countermeasures

20.6.3 Blindly Pursuing “More”

Some clients believe that the more materials used, the better, so they mix various materials. As a result, the facade is messy and lacks focus.

Correct approach: Find a balance between “richness” and “simplicity.” Good design is often less is more.

Table 20-23 Misconception of Blindly Pursuing More and Countermeasures

20.6.4 Blindly Pursuing “Fast”

Some clients believe that facade retrofit should be as fast as possible, so they compress design time and construction time. As a result, design is rough, construction is rough, and the effect is greatly reduced.

Correct approach: Find a balance between “speed” and “quality.” Good design requires time, and good construction also requires time.

Table 20-24 Misconception of Blindly Pursuing Fast and Countermeasures

20.6.5 Blindly Pursuing “Saving”

Some clients believe that facade retrofit should be as economical as possible, so they compress design fees, material fees, and construction fees. As a result, design is mediocre, materials are low-quality, construction is rough, and the effect is greatly reduced.

Correct approach: Find a balance between “saving money” and “effect.” Money that should be spent must be spent; money that should be saved must be saved.

Table 20-25 Misconception of Blindly Pursuing Saving and Countermeasures

A practical summary of the “five misconceptions”:

Facade retrofit design is not the newer the better, the more expensive the better, the more the better, the faster the better, or the more economical the better, but finding a balance between “new and coordination,” “expensive and effect,” “more and simplicity,” “fast and quality,” and “saving and effect.” Design drawings solve specific problems; the five balances provide a decision-making framework. When the framework is right, the drawings are meaningful.

Among the five balances, new and coordination is the appearance bottom line, expensive and effect is investment rationality, more and simplicity is design restraint, fast and quality is engineering rhythm, and saving and effect is cost control. The five balances together constitute the decision-making coordinates of facade retrofit design; none can be deviated from.

20.7 Decision Reference for Facade Retrofit Offices

Key Decision Points of This Chapter

• The core logic of facade retrofit design is the shift from material thinking to system thinking: define problems first, then select materials and approaches. Clear design objectives are the premise for a valid scheme.
• The five design approaches (renewal, accentuation, restoration, contrast, integration) cover five typical scenarios in facade retrofit: overall building renewal, local enhancement, appearance protection, old-new symbiosis, and district unification. Approach selection is determined by building condition and renewal objectives.
• Color and texture selection should follow comprehensive judgment of three dimensions: building temperament, surrounding environment, and functional needs; it should not be determined solely by subjective preference.
• Joint design and node design are the final control links of flexible stone facade effect; after parameters are determined, construction precision is still needed to ensure implementation.
• The five balances (new and coordination, expensive and effect, more and simplicity, fast and quality, saving and effect) are the overall framework for facade retrofit design decision-making, applicable to scheme review and process correction.

Compliance Check Items

• Verify whether the design scheme includes character research records, and whether opinions from cultural relics or character authorities have been sought for historic buildings and character protection areas.
• Verify whether key parameters such as color, texture, joints, and nodes are clearly marked in design documents, and whether they match material selection and construction processes.
• Verify whether customized textures such as stone-imitation, brick-imitation, and wood-imitation provide physical samples or effect confirmation records, and whether they are implemented after joint confirmation by the client and design party.
• Verify whether joint width and spacing are within reasonable ranges, and whether temperature stress release measures such as expansion joints are clearly specified in the design.
• Verify whether waterproofing treatment and drip line settings at key nodes such as eaves, window walls, and entrances meet construction requirements.
• Verify whether the design scheme avoids the five common misconceptions, and whether design decisions have review records and adjustment bases.

Cost Reference Range

• Design fees account for 2%–5% of total cost; complex facades or historic building restoration projects can be increased to 5%–8%. Design scheme depth directly determines construction efficiency and quality; excessive compression is not recommended.
• Customized texture flexible stone has a premium of about 5%–15% over conventional textures; antique customized textures, due to separate color mixing and plate making, can have a premium of 15%–30%. The larger the batch, the lower the unit premium.
• Additional costs for joint design and node treatment account for about 1%–3% of total cost, including joint filler strips, sealant, drip lines, and other materials and construction costs.
• Sample-first costs account for about 0.5%–1% of total cost, including materials, labor, site, and multiple adjustment consumption. Sample wall confirmation is the most economical investment to avoid large-area rework.
• The above costs are based on local market prices; specific projects need to be determined according to actual schemes and bidding conditions.

Risk Warnings

• Risk of producing schemes without clear design objectives: direction repeatedly adjusted, schemes repeatedly modified, design cycle and cost out of control.
• Risk of blindly pursuing new, expensive, more, fast, or saving: facade conflicts with surrounding environment, cost overrun, messy effect, rough quality—any deviation will affect the overall facade retrofit effect.
• Risk of unreasonable joint parameters: excessive spacing leads to inability to effectively release temperature stress, making flexible stone prone to bulging or cracking; too small spacing makes the facade fragmented and affects aesthetics.
• Risk of missing node waterproofing construction: water seepage at eaves, windowsills, entrances, and other parts forms leakage complaints after delivery, with maintenance costs far exceeding prevention investment.
• Risk of large-area construction without confirmed samples for customized textures: color differences and tactile deviations are difficult to correct after completion, with large rework losses.
• Risk of historic building restoration without confirmation from character authorities: design rejected for non-compliance with protection requirements, delaying schedule and causing waste.

Replicability Judgment

• The three transformations, five design approaches, five color series, five texture series, and joint design and node design points constitute a complete facade retrofit design method framework that can be directly used for scheme preparation and design review.
• The five-balance decision-making framework applies to various facade retrofit projects and is recommended to be included in the mandatory review content of facade retrofit project design schemes.
• The systematic classification method of color and texture can serve as a technical tool for unified appearance management in street or district facade retrofit.
• It is recommended to solidify the five-step process of “character research—design condition definition—sample confirmation—node detailing—review records” into the basic procedure of facade retrofit design management to improve the controllability of design quality.

Reflections on Stone, Insights on Fortune

Facade retrofit design is not changing clothes, but reshaping. Changing clothes only requires changing a layer of skin; reshaping requires re-understanding the building’s temperament, history, environment, and function.

The deepest impression the editorial team gained when reviewing facade retrofit cases is one sentence: design fears vague objectives the most. When objectives are clear, materials and approaches have a selection basis; when objectives are vague, schemes can only be consumed in repeated modifications. The five balances are not frames limiting design, but coordinates helping design return to the right path. New and coordination, expensive and effect, more and simplicity, fast and quality, saving and effect—they look like constraints, but are actually the shortest path to avoid rework and disputes.

Joints and nodes look like fine work, but are actually the final fulfillment of design. Design ideas, colors, and textures must ultimately land on the wall through these “fine works.” If fine work is not done well, design intent is discounted. The value of facade retrofit design is half in the scheme and half in implementation. Only when both legs stand firm is the project truly established.

References

[1] Norberg-Schulz. Genius Loci: Towards a Phenomenology of Architecture[M]. Shi Zhiming, trans. Wuhan: Huazhong University of Science and Technology Press, 2010.

[2] GB 50210—2018, Standard for Construction Quality Acceptance of Building Decoration[S]. Beijing: China Architecture & Building Press, 2018.

[3] GB 50352—2019, Uniform Standard for Design of Civil Buildings[S]. Beijing: China Architecture & Building Press, 2019.

[4] T/CECS 860—2021, Technical Standard for Comprehensive Renovation of Old Urban Residential Areas[S]. Beijing: China Architecture & Building Press, 2021.

[5] JC/T 2219—2014, Modified Inorganic Powder Composite Building Facing Sheet[S]. Beijing: China Building Materials Industry Press, 2014.