Why Is Shuttering In Construction Crucial? | What Is Shuttering In Construction?

Shuttering, or formwork, acts as the mold that embraces concrete during its critical phase of solidification. Shuttering, often overlooked but integral to construction, plays a pivotal role in ensuring the structural integrity and aesthetics of concrete structures. In this article, we delve into the why’s and how’s of shuttering, uncovering its significance and providing valuable insights into the best techniques for success.

What is Shuttering in Construction?

Shuttering refers to the process of creating temporary molds or formwork into which concrete is poured and allowed to set. This essential step ensures that the concrete takes on the desired shape and structure as it solidifies.

The purpose of shuttering is to provide a framework that supports the concrete during its critical phase of hardening. It acts as a mold, shaping the material according to the specifications of the construction project. Once the concrete achieves its required strength, the shuttering is removed, leaving behind the formed structure.

Why is Shuttering Essential?

Shuttering is essential in construction for several key reasons that profoundly impact the overall success and quality of a project. Here are the primary reasons why shuttering is indispensable:

Structural Integrity: The primary purpose of shuttering is to provide support to freshly poured concrete until it gains sufficient strength to stand on its own. This ensures that the structure maintains its intended shape and form during the critical curing phase. Without proper shuttering, there’s a risk of deformities, uneven settling, and compromised structural integrity.

Forming Complex Shapes: Shuttering allows for the creation of complex and customized shapes in concrete structures. It acts as a mold, enabling builders to shape concrete into diverse forms required by architectural and engineering designs. This flexibility is crucial for constructing a wide range of structures, from simple foundations to intricate architectural elements.
Aesthetic Considerations: Shuttering significantly influences the visual appearance of the final concrete surface. By using high-quality formwork, it’s possible to achieve a smooth and uniform finish, enhancing the overall aesthetics of the structure. This is particularly important in architectural projects where the visual appeal is a key consideration.
Support During Curing: Concrete requires a specific period to cure and gain strength. Shuttering provides the necessary support during this critical phase, preventing the concrete from slumping or sagging. Properly designed and implemented shuttering ensures that the curing process occurs uniformly, resulting in a strong and durable structure.

Cost-Effective Construction: Shuttering, when chosen wisely based on the project’s requirements, can contribute to cost-effectiveness. Reusable formwork materials, such as steel or aluminum, can be employed for multiple construction cycles, reducing material costs and waste.
Versatility in Construction: Shuttering is adaptable to various construction scenarios, allowing for versatility in project execution. It is employed in the construction of buildings, bridges, tunnels, and other structures, showcasing its applicability across diverse construction projects.
Construction Speed and Efficiency: Well-planned shuttering methods contribute to the efficiency of the construction process. It allows for faster concrete placement and setting, accelerating the overall construction timeline.

Shuttering is an indispensable component in construction, playing a pivotal role in ensuring the stability, aesthetics, and functionality of concrete structures. Its multifaceted benefits make it a fundamental step in the construction process, contributing to the success of projects both in terms of performance and visual appeal.

Why is Shuttering Important in Construction?

Shuttering is essential because it ensures the concrete takes the desired shape and maintains its position during the curing process. Without proper shuttering, concrete could flow out of place, leading to uneven surfaces or weak structures. Shuttering also protects concrete from environmental factors like wind, rain, and temperature changes that could affect its setting process.

What is the method of shuttering?

The method of shuttering, also known as formwork, involves the process of creating temporary molds or frameworks into which concrete is poured to give it a specific shape and structure. The method varies depending on the type of formwork materials used and the complexity of the construction project. Here is a general outline of the method of shuttering:

Design and Planning:
- Before the construction process begins, detailed planning and design of the formwork are crucial. This includes determining the shape and dimensions of the structure, selecting appropriate formwork materials, and ensuring adequate support and bracing.

Selection of Formwork Materials:
- Different projects may require different formwork materials. Common choices include wood, steel, and aluminum. Each material has its own advantages, such as cost-effectiveness, reusability, and adaptability to various shapes.

Preparing the Site:
- The construction site needs to be prepared for the installation of formwork. This involves clearing the area, ensuring a level surface, and setting up the necessary support for the formwork.

Setting Up Formwork:
- The formwork is assembled on-site according to the pre-designed plans. This involves placing panels or molds in the desired configuration to create the shape of the concrete structure.

Installing Reinforcement:
- If the project requires reinforcement, such as steel bars or mesh, it is installed within the formwork before concrete pouring. This reinforcement enhances the strength and durability of the final structure.

Ensuring Watertightness:
- To prevent leakage and ensure a smooth finish, joints and connections in the formwork are carefully sealed to make it watertight. This is particularly important to avoid any defects in the concrete caused by water infiltration.

Concrete Pouring:
- Once the formwork is securely in place, concrete is poured into the mold. Care must be taken to distribute the concrete evenly and eliminate air pockets, ensuring a solid and uniform structure.

Curing Period:
- After concrete pouring, the curing process begins. During this time, the concrete gains strength. The formwork must remain in place until the concrete achieves the necessary structural integrity.

Stripping the Formwork:
- After the concrete has sufficiently cured, the formwork is carefully removed. This step requires precision to avoid damaging the concrete surface or structure. The stripped formwork can be cleaned and prepared for reuse if applicable.

Finishing Touches:
- Once the formwork is removed, any necessary finishing touches, such as smoothing or texturing the concrete surface, can be carried out to meet the project’s aesthetic requirements.

The method of shuttering is a crucial aspect of the construction process, influencing the quality, appearance, and structural integrity of the final concrete structure. Careful planning and execution are essential to ensure a successful outcome.

What Are the Best Methods for Shuttering?

Several methods for shuttering, also known as formwork, are employed in construction, each catering to specific project requirements. Here are some of the best methods for shuttering:

Traditional Wooden Formwork:
- Method: This involves using wooden boards, planks, or plywood to create molds for the concrete. The wooden formwork is assembled on-site and provides flexibility in shaping various structures.
- Advantages: Cost-effective, readily available, and suitable for a wide range of construction projects.

Steel Formwork:
- Method: Steel panels, usually prefabricated, are assembled to create a robust formwork system. Steel formwork is known for its durability, strength, and ability to handle complex structures.
- Advantages: Reusable for multiple construction cycles, provides a smooth finish, and offers high strength and stability.
Aluminum Formwork:
- Method: Similar to steel formwork but using aluminum panels. Aluminum formwork is lightweight, corrosion-resistant, and often comes with integrated systems for easy assembly.
- Advantages: Fast construction speed, suitable for large-scale projects, and offers high precision and smooth finishes.
Engineered Plastic Formwork:
- Method: Modular plastic panels are assembled to create formwork. These panels are lightweight, easy to handle, and can be customized for various shapes.
- Advantages: Durable, cost-effective, and suitable for repetitive use. They are also eco-friendly and easy to clean.

Jump Formwork:
- Method: Jump formwork, also known as climbing formwork, is a method where the formwork is lifted vertically as the construction progresses. This method is commonly used in the construction of vertical structures like towers and cores.
- Advantages: Enables continuous construction, efficient for tall structures, and minimizes the need for dismantling and reassembling.
Slip Formwork:
- Method: Slip formwork involves a continuously moving formwork system that molds the concrete as it moves vertically. This method is often used for constructing tall structures with a consistent cross-section.
- Advantages: High construction speed, suitable for cylindrical structures, and efficient for projects with repetitive elements.
Tunnel Formwork:
- Method: Tunnel formwork is a system for constructing walls and slabs simultaneously. The formwork is typically made of plywood and is moved horizontally to create continuous sections of the structure.
- Advantages: Efficient for mass production of similar structures, reduces construction time, and provides a smooth finish.

Climbing Formwork:
- Method: This formwork is designed to climb vertically, following the construction progress of a structure. It is commonly used for constructing vertical elements like columns and walls.
- Advantages: Allows for continuous construction, reduces labor costs, and is suitable for projects with repetitive vertical elements.

The choice of the best method for shuttering depends on factors such as the type of structure, project scale, budget, and timeline. Each method has its advantages, and experienced construction professionals select the most suitable formwork system based on the specific needs of the project.

What material is used for shuttering?

Various materials are used for shuttering, also known as formwork, in construction. The choice of material depends on factors such as the type of structure being built, project requirements, budget constraints, and the number of times the formwork will be reused. Here are some common materials used for shuttering:

Wood:
- Type: Plywood, timber, and other wooden materials.
- Advantages: Cost-effective, readily available, and suitable for a wide range of construction projects. Can be easily cut and shaped to form diverse structures.
- Considerations: Wooden formwork may require more maintenance and may have a limited lifespan compared to metal alternatives.
Steel:
- Type: Steel panels or sheets.
- Advantages: Highly durable, strong, and suitable for repetitive use. Provides a smooth finish to the concrete surface. Resistant to wear and tear.
- Considerations: Initial investment can be higher, but the long lifespan and reusability make it cost-effective over multiple construction cycles.
Aluminum:
- Type: Aluminum panels or alloy forms.
- Advantages: Lightweight, corrosion-resistant, and offers high precision. Well-suited for large-scale projects due to its fast construction speed. Can be reused for multiple cycles.
- Considerations: While lightweight, aluminum may not be as strong as steel. Care must be taken to avoid damage during handling.

Engineered Plastic:
- Type: Modular plastic panels.
- Advantages: Lightweight, easy to handle, and environmentally friendly. Resistant to moisture and chemicals. Can be reused for multiple cycles.
- Considerations: May have limitations in terms of load-bearing capacity and may require proper maintenance to ensure longevity.
Fiberglass:
- Type: Fiberglass-reinforced plastic (FRP).
- Advantages: Lightweight, durable, and corrosion-resistant. Provides a smooth finish to the concrete surface. Can be reused for several construction cycles.
- Considerations: Higher initial cost, but the long lifespan and reusability contribute to cost-effectiveness.
Fabric:
- Type: Fabric formwork made of textile materials.
- Advantages: Flexible and adaptable for creating unique shapes. Lightweight and easy to handle. Can be cost-effective for specific architectural designs.
- Considerations: Limited to certain applications, may not be suitable for all types of structures.

Plywood:
- Type: Plywood sheets.
- Advantages: Commonly used for small to medium-sized projects. Relatively cost-effective and easy to work with.
- Considerations: May have a shorter lifespan compared to metal alternatives, especially in harsh weather conditions.

The selection of shuttering material is a critical decision in construction, impacting factors such as cost, construction speed, quality of finish, and the environmental impact of the project. The choice often involves a balance between initial investment, project requirements, and the anticipated number of formwork uses.

How do you calculate shuttering quantity?

Calculating the quantity of shuttering, also known as formwork, involves determining the amount of material needed to create molds for the concrete during construction. The calculation considers the surface area, thickness, and type of formwork material. Here’s a general guide on how to calculate shuttering quantity:

1. Identify the Surface Area:

Determine the surface area that requires formwork. This includes the area of walls, slabs, columns, and other concrete elements. Measure the length, width, and height (thickness) of each component.

2. Calculate the Total Surface Area:

Sum up the surface areas of all the concrete elements to get the total surface area to be covered with formwork. For walls, use the formula: Total Surface Area=2×(Length + Width)×Height
For slabs, the total surface area is the product of length and width.

3. Determine the Formwork Area Factor:

Different formwork materials cover varying surface areas due to joints, overlaps, and connections. Determine the formwork area factor based on the type of formwork material being used.

4. Calculate the Total Formwork Area:

Multiply the total surface area by the formwork area factor to get the total formwork area required. Total Formwork Area=Total Surface Area×Formwork Area Factor

5. Account for Reusability:

If the formwork material is reusable, consider the number of times it can be reused for multiple construction cycles. Adjust the total formwork area accordingly.

6. Include Wastage:

Factor in a wastage percentage to account for cuts, damages, and other potential material losses during the construction process. This helps ensure that you have enough material on-site.

7. Convert to Volume:

If the formwork quantity is measured in terms of thickness, convert the total formwork area to volume by multiplying it by the thickness of the concrete element. Total Formwork Volume=Total Formwork Area×ThicknessTotal Formwork Volume=Total Formwork Area×Thickness

8. Unit Conversion:

If required, convert the formwork volume into the appropriate unit of measurement, such as cubic meters or square feet, based on project specifications.

Example:

For a wall with dimensions 4 meters (length) x 3 meters (height) and a thickness of 0.2 meters,

The total surface area would be 2×(4+3)×0.2=2.6 square meters (ignoring openings for simplicity).

If using a formwork area factor of 1.2 for the selected material, the total formwork area required would be 2.6 square meters×1.2=3.12 square meters.

Remember that the specific requirements for each project may vary, and it’s essential to consult with construction professionals and engineers for accurate and project-specific calculations.

What is difference between formwork and shuttering?

The terms “formwork” and “shuttering” are often used interchangeably in the construction industry, and both refer to the temporary molds or structures used to shape and support concrete until it hardens. However, there is a subtle difference between the two:

Formwork:

Definition: Formwork is the general term used to describe the temporary structure or mold into which concrete is poured and allowed to set.
Scope: Formwork encompasses the entire system of molds and supports, including vertical forms for walls, horizontal forms for slabs, column forms, beam forms, and other specialized molds for different structural elements.

Materials: Formwork materials can include wood, steel, aluminum, fiberglass, or engineered plastics.
Function: The term “formwork” is more comprehensive and refers to the entire system that shapes the concrete elements during construction.

Shuttering:

Definition: Shuttering is a specific subset of formwork and specifically refers to the vertical or lateral sides of the formwork used for walls, columns, and similar vertical structures.
Scope: Shuttering is primarily concerned with the vertical surfaces that confine and shape the concrete in structures such as walls. It is a subset of formwork and is often used to describe the process of creating molds for vertical elements.
Materials: The materials used for shuttering are the same as those used for formwork in general.

Function: Shuttering is a term that is more focused on the specific task of creating molds for vertical surfaces.

In summary, while “formwork” is a broader term encompassing the entire temporary structure used in concrete construction, “shuttering” specifically refers to the part of the formwork system that is responsible for shaping vertical elements like walls. In practice, the two terms are often used interchangeably, and the distinction may not always be strictly observed.

What is difference between Centring and shuttering?

“Centring” and “shuttering” are terminologies used in the construction industry, specifically in the context of concrete construction. While they are closely related, they refer to different aspects of the formwork system:

Centring:

Definition: Centring, also known as centering or staging, primarily refers to the temporary support structures used to carry the weight of arches or horizontal members during construction until the mortar or concrete has set.
Application: Centring is commonly employed in masonry arch construction, especially in the construction of bridges, vaults, and other structures where horizontal elements like arches need support during the construction process.
Materials: Centring materials historically included timber or wooden members, but modern construction may also use steel or other materials for enhanced strength.

Shuttering:

Definition: Shuttering, also known as formwork, is the temporary mold or casing into which concrete is poured and allowed to set. It is used for creating various structural elements, including walls, columns, beams, and slabs.
Application: Shuttering is a more general term and is applicable to both horizontal and vertical surfaces. It defines the process of creating molds to shape the concrete into desired forms during construction.
Materials: Shuttering materials can include wood, steel, aluminum, fiberglass, or engineered plastics, depending on the specific requirements of the construction project.

Key Differences:

Orientation: Centring is specifically associated with horizontal support structures, often used in arch construction, while shuttering is a more comprehensive term that encompasses both vertical and horizontal molds used in concrete construction.
Function: Centring is primarily concerned with supporting the weight of horizontal elements during construction, ensuring they maintain the correct form until the concrete sets. Shuttering, on the other hand, is concerned with creating molds for concrete in both vertical and horizontal applications.

In summary, while both centring and shuttering are essential components of the formwork system, centring is more specific to horizontal support structures for elements like arches, and shuttering is a broader term that includes both vertical and horizontal molds used in various concrete construction applications.

How does shuttering affect the aesthetics of a structure?

Shuttering, also known as formwork, plays a significant role in shaping the aesthetics of a structure. The impact on aesthetics is particularly notable in the visible surfaces of concrete elements, such as walls, columns, and beams. Here’s how shuttering affects the aesthetics of a structure:

Surface Finish:
- The type of shuttering material and the quality of formwork directly influence the surface finish of the concrete. Well-designed and smooth formwork results in a visually appealing and uniform surface on the final structure.
Imprint and Texture:
- Shuttering materials may leave imprints or textures on the concrete surface. Wood grain, steel panel patterns, or the smooth finish of high-quality formwork contribute to the overall texture of the concrete, impacting the visual impression.
Consistency in Appearance:
- Properly executed shuttering ensures consistency in the appearance of concrete surfaces. Uniformity in texture, color, and finish across different elements of the structure enhances the overall aesthetic appeal.
Architectural Details:
- Shuttering allows for the creation of intricate architectural details. The formwork molds the concrete into specific shapes, patterns, or decorative elements according to the design intent, contributing to the uniqueness and attractiveness of the structure.
Surface Blemishes and Defects:
- In contrast, poorly executed shuttering can lead to surface blemishes and defects on the concrete. Irregularities, rough patches, or uneven finishes may detract from the desired aesthetics of the structure.
Exposed Aggregate Finishes:
- Shuttering methods can be employed to achieve specific finishes, such as exposed aggregate. In this technique, the formwork is designed to expose the aggregates in the concrete mix, creating a textured and visually interesting surface.
Architectural Concrete Finishes:
- Architectural concrete finishes, including board-formed concrete or precast concrete with intricate patterns, are achieved through specialized shuttering techniques. These finishes contribute to the architectural character of the structure.
Color and Staining:
- Shuttering can influence the coloration of the concrete surface. Staining or pigmentation of the formwork material may transfer onto the concrete, adding subtle variations in color and enhancing the aesthetic richness.
Modern and Sleek Designs:
- Shuttering materials like steel and aluminum allow for the creation of modern and sleek designs. The smooth and clean lines achieved with these materials contribute to a contemporary aesthetic, especially in architectural projects.

The aesthetics of a structure are significantly influenced by the careful selection and execution of shuttering methods. The formwork not only shapes the physical form of the concrete but also determines the visual quality of the finished surfaces. Well-designed and meticulously executed shuttering enhances the overall appeal of the structure, contributing to its architectural character and aesthetic value.

Can I reuse formwork materials?

Yes, many formwork materials are designed to be reusable, and their reuse is a common practice in construction. The ability to reuse formwork offers several advantages in terms of cost-effectiveness, sustainability, and efficiency in construction processes. Here are key points regarding the reuse of formwork materials:

Steel Formwork:
- Reuse: Steel formwork is highly durable and can be reused for multiple construction cycles. Its strength and resistance to wear make it a cost-effective choice for projects with repetitive elements.
Aluminum Formwork:
- Reuse: Similar to steel formwork, aluminum formwork is known for its reusability. Its lightweight nature and corrosion resistance contribute to its suitability for multiple construction cycles.
Wooden Formwork:
- Reuse: Wooden formwork can be reused, especially if it is well-maintained. While wood is generally more susceptible to wear and damage compared to metal alternatives, proper care and occasional repairs can extend its lifespan.
Engineered Plastic Formwork:
- Reuse: Engineered plastic formwork is designed to be reusable. Its modular nature and resistance to environmental factors make it suitable for multiple uses, contributing to sustainability in construction.
Quality and Maintenance:
- Consideration: The decision to reuse formwork materials depends on their overall condition after each use. Regular inspection, maintenance, and repair are crucial to ensuring the structural integrity and safety of the formwork for subsequent applications.
Cleaning and Preparation:
- Procedure: After each use, formwork materials need to be thoroughly cleaned, and any concrete residue removed. Proper cleaning is essential for maintaining the quality of the formwork and preparing it for the next construction cycle.
Adaptability to Different Projects:
- Consideration: The adaptability of formwork materials to different project requirements influences their reuse. Materials that can be easily adjusted or modified for varying shapes and sizes enhance their versatility and suitability for reuse.
Cost-Efficiency:
- Advantage: Reusing formwork materials can contribute to cost savings in construction projects. While the initial investment in quality formwork may be higher, the ability to reuse it for multiple cycles reduces the overall cost per use.

The reuse of formwork materials is a common and practical approach in construction, providing economic and environmental benefits. The decision to reuse formwork depends on factors such as material type, quality, maintenance, adaptability, and overall project requirements. Proper care and attention to quality control are essential to maximize the lifespan and effectiveness of reusable formwork.

Do’s and Don’ts of Shuttering

Do’s of Shuttering:

Prioritize Proper Planning:
- Do: Thoroughly plan the layout of the formwork before construction begins. This includes considering the shape, dimensions, and materials needed for the specific structure.
Ensure Adequate Support:
- Do: Provide sufficient support for the formwork to withstand the pressure exerted by the concrete during pouring. Adequate bracing and shoring are essential for maintaining the integrity of the structure.
Use Quality Formwork Materials:
- Do: Invest in high-quality formwork materials, whether wood, steel, aluminum, or engineered plastic. The durability and stability of the formwork directly impact the quality of the final structure.
Implement Waterproofing Measures:
- Do: Waterproof the formwork to prevent water infiltration, which can lead to concrete defects and compromise the structural integrity. Proper sealing of joints and connections is crucial.
Follow Safety Guidelines:
- Do: Adhere to safety regulations during the installation and removal of formwork. Ensure that workers are equipped with appropriate personal protective equipment (PPE) and follow safe practices throughout the process.
Check for Alignment and Leveling:
- Do: Regularly check the alignment and leveling of the formwork during the construction process. This ensures that the concrete takes the intended shape and avoids uneven settling.
Ensure Proper Concrete Placement:
- Do: Pour concrete evenly into the formwork to avoid air pockets and ensure a uniform distribution of the material. Proper vibration techniques can help eliminate trapped air.
Plan for Formwork Removal:
- Do: Consider the proper time for removing the formwork. Waiting for the concrete to achieve sufficient strength is essential to prevent damage to the structure.

Don’ts of Shuttering:

Neglect Waterproofing:
- Don’t: Overlook the importance of waterproofing the formwork. Water infiltration can lead to weakened concrete and compromise the overall quality of the structure.
Underestimate Material Quality:
- Don’t: Compromise on the quality of formwork materials. Low-quality materials can result in formwork failure, affecting the concrete’s shape and strength.
Rush the Planning Phase:
- Don’t: Skip or rush through the planning phase. Thorough planning ensures that the formwork meets the project’s requirements and minimizes the risk of errors during construction.
Neglect Safety Procedures:
- Don’t: Ignore safety guidelines during the installation and removal of formwork. Safety should be a top priority to prevent accidents and injuries on the construction site.
Forget Adequate Support:
- Don’t: Neglect providing adequate support for the formwork. Inadequate bracing and support can lead to formwork failure, affecting the concrete’s shape and finish.
Use Damaged Formwork:
- Don’t: Use damaged or compromised formwork. Damaged formwork can result in structural defects and compromise the stability of the entire construction.
Remove Formwork Too Early:
- Don’t: Remove the formwork before the concrete has achieved sufficient strength. Premature removal can lead to deformation and cracking of the concrete.
Disregard Quality Control:
- Don’t: Disregard quality control measures. Regularly inspect the formwork, concrete placement, and curing process to ensure the construction meets the desired standards.

FAQs

What is the purpose of shuttering in construction?

Shuttering provides a mold for concrete, ensuring it sets in the desired shape and maintains structural integrity.

Can shuttering be reused?

Yes, depending on the material. Steel, aluminum, and plastic shuttering can be reused multiple times, while timber is less durable.

How do you prevent concrete from sticking to the shuttering?

Use a release agent or oil on the shuttering surface to prevent concrete from sticking.

What is the difference between shuttering and scaffolding?

Shuttering is used to mold concrete, while scaffolding provides support and access for workers.

Is it necessary to use shuttering in all construction projects?

Yes, shuttering is essential for any project involving poured concrete.

How do you calculate the amount of shuttering required?

Calculate the area to be covered and add an extra percentage for wastage and overlaps.

What materials are commonly used for shuttering?

Common materials include timber, steel, aluminum, plastic, and plywood.

Can shuttering be left in place permanently?

Generally, no. Shuttering is removed after the concrete has set, although in some cases, it can be left as part of the permanent structure.

What are the safety considerations in shuttering?

Ensure proper support and alignment to avoid collapse and accidents during concrete pouring.

How does the weather affect shuttering?

Weather conditions can impact the setting time of concrete and the materials used for shuttering. For example, extreme cold can slow down the curing process.

Key Takeaways

Shuttering is crucial for shaping and supporting concrete in construction.
Different materials are used for shuttering, each with its own benefits.
Proper shuttering practices ensure structural integrity and aesthetic quality.
Understanding the do’s and don’ts of shuttering can prevent common construction issues.

Conclusion

Shuttering is a vital component in construction that ensures the safety, quality, and efficiency of a project. From choosing the right materials to understanding best practices, a solid grasp of shuttering can lead to successful outcomes. Whether you’re managing a small residential project or a large commercial build, the importance of proper shuttering cannot be overstated. Always prioritize quality and safety in your shuttering practices to achieve the best results.

Why is Shuttering in Construction Crucial? | What is Shuttering in Construction?