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Cornice Explained – Between a Wall and a Ceiling


A cornice is a decorative element that is typically installed at the intersection of a room’s walls and ceiling. It is a type of molding that is used to enhance the aesthetic appeal of a room, and it can be made from a variety of materials such as plaster, wood, and gyprock.

What is Cornice?

In internal gyprock plastering, cornices are used to add architectural detail and character to a room. They can be used to create a sense of height, to conceal the gap between the walls and ceiling, and to add visual interest.

Gyprock types are typically made by cutting and shaping pieces of gyprock, and then attaching them to the walls and ceiling using adhesive and fasteners. They can be painted or papered to match the walls, or they can be left unpainted for a more textured look.

Gyprock types are popular in the internal plastering industry due to their durability, ease of installation, and cost-effectiveness. They can be used in both new construction and renovation projects, and they can be customized to match a wide range of architectural styles. They are also a good alternative to traditional plaster types as they are less fragile and easier to install than plaster types.

ceiling plaster cornice - Toowoomba 003Different Designs

They come in a variety of shapes and designs, some of the most common designs are:

  • Simple square or rectangular:  Often used in modern or minimalist interiors.
  • Ornate and detailed:  Has more elaborate designs and details and it is often used in traditional or historical interiors.
  • Curved and arched: Often used in Victorian or Edwardian interiors.
  • Scalloped and wave: Regularly used in Art Deco or Art Nouveau interiors.
  • L-shaped and U-shaped: Used to cover the joint between wall and ceiling, it can be used in any interior style.
  • Custom: These can be made to order and can be designed to match the specific style and aesthetic of a building or room.

The choice of shape will depend on the architectural style of the building and the desired aesthetic look of the room. Some builders and architects also choose to mix and match different shapes and designs for a more eclectic look.

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Siniat is a leading manufacturer of plaster and gyprock products, including a wide range of plaster cornices. 

If you would like any more advice on selection or simply like to talk through a project you’re undertaking – please just reach out to us.

Frequently Asked Questions

How do I repair gyprock cornices?

Repairs to gyprock cornices can be done by patching any holes or cracks with joint compound and sanding the area smooth. It’s important to prime and paint the repaired area to match the surrounding cornice. If the damage is extensive, it may be necessary to replace the entire section.

Are gyprock cornices fire resistant?

Gyprock cornices are made from gypsum plaster, which is a naturally fire-resistant material. However, it is important to note that gyprock alone do not provide fire resistance and should be used in conjunction with other fire-rated materials and systems.

How do I clean gyprock cornices?

Gyprock can be cleaned with a damp cloth and mild detergent. Avoid using abrasive cleaners or scrubbers, as they can damage the surface.

Are gyprock cornices suitable for outdoor use?

Gyprock is not designed for outdoor use and may become damaged if exposed to the elements. It’s important to keep them indoor use.

How can I tell if my gyprock cornice is installed correctly?

A correctly installed gyprock cornice will be level and flush with the ceiling and walls, without any gaps or holes. The corners and edges should be straight and clean.

Are gyprock cornices a cost-effective solution for cornice installation?

Gyprock is a cost-effective solution for cornice installation compared to other traditional materials such as timber or plaster. They are lightweight, easy to install and can be painted to match the surrounding walls, which makes them a versatile and affordable option.

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Fixing Sagging Ceilings – Tips & Tricks

sagging ceilings

Are you experiencing sagging ceilings in your home or workplace? 

We understand the frustrations and apprehensions this issue can evoke. Rest assured, we’re here to alleviate your concerns and provide you with exceptional plastering services tailored to your needs.

Sagging Ceilings – What are they?

Sagging ceilings can occur due to various factors, including insufficient support, excessive moisture, improper installation, age-related deterioration, and plaster shrinkage. It is crucial to address these concerns promptly, as they may signify underlying structural issues. As experienced professionals, we possess the expertise to identify the cause and provide appropriate solutions.

Getting them Fixed – The Process

When you choose our team, we commence the process by conducting a thorough assessment of your sagging ceilings. Our skilled team will carefully examine the underlying factors contributing to the problem. If there are any underlying issues such as leaks or structural concerns, we will address them before proceeding with the plaster repair.

The next step involves the careful removal of the sagging plaster, ensuring the preservation of ceiling joists and framing. If insufficient support is the cause, we will install additional reinforcements such as metal straps to fortify the ceiling structure. Once the underlying issues are resolved, our team will skillfully apply a new coat of high quality plaster to restore the integrity and aesthetics of your ceiling.

The repair process concludes with meticulous sanding and painting, blending the repaired area seamlessly with the surrounding ceiling. Our aim is to provide a flawless finish that enhances the overall appeal of your home.

We take great pride in delivering exceptional customer service. Our dedicated team is committed to ensuring your experience with us is smooth and hassle-free. From the initial assessment to the final touches, we strive for excellence in every aspect of our work.

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Other Reasons for Sagging Ceilings & How to Fix Them

  1. a) Insufficient Support:

One common cause of sagging ceilings is insufficient support. Over time, the weight of the plaster can strain the ceiling joists and framing, leading to sagging. 

Our experts will assess the structural integrity of your ceiling and determine the appropriate reinforcements needed to support the plaster. By installing additional supports such as metal straps or reinforcing the existing structure, we ensure a sturdy and long-lasting solution.

  1. b) Excessive Moisture:

If there is a leak in the roof or plumbing, water can seep into the ceiling, causing the plaster to soften and sag. 

Our team will carefully inspect the area for signs of moisture and identify the source of the leak. Addressing the underlying moisture issue is crucial to prevent further damage. We will repair the leak and ensure that the affected area is thoroughly dried before proceeding with the plaster repair.

  1. c) Improper Installation:

Sometimes, sagging ceilings occur due to improper installation of the plaster. If the plaster was not applied properly or did not adhere well to the surface, it can lead to sagging over time. 

Our expert team will carefully remove the poorly adhered plaster and prepare the surface for a new application. With our precise plastering techniques, we guarantee a strong bond between the plaster and the ceiling, preventing future sagging.

  1. d) Age-Related Deterioration:

Plaster can deteriorate over time, especially if it was applied over an older, weaker surface. This deterioration can manifest as cracking, flaking, and sagging ceilings. 

We will assess the condition of the existing plaster and determine the best course of action. We will carefully remove any compromised plaster, reinforce the underlying structure if necessary, and apply a fresh coat of plaster to restore the ceiling’s integrity and appearance.

  1. e) Plaster Shrinkage:

During the drying process, plaster naturally shrinks. If the plaster is applied too thickly, it can lead to cracking, weakness, and sagging ceilings. 

Our experienced plasterers understand the proper application techniques to minimize shrinkage and ensure a smooth and stable finish. By applying the appropriate thickness and allowing for proper drying and curing, we prevent sagging and create a visually pleasing result.

It is important to note that while the above steps outline a general approach, the specific requirements of your sagging ceiling may vary. Severity of the sagging and the materials used may influence the course of action. In cases where the sagging is severe and caused by structural issues, we recommend consulting a professional contractor to ensure the safety of the repair.

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Need a hand?

At Apex Plasterers Toowoomba, we are dedicated to exceeding your expectations. Our commitment to customer satisfaction extends beyond the repair process. We prioritize open communication and transparency throughout the project, keeping you informed about the progress and addressing any questions or concerns you may have.

We understand the significance of your home and the desire for a safe and beautiful living environment. Our skilled team, equipped with the necessary tools and expertise, is ready to restore the splendor of your ceiling. With years of experience in the plastering industry, we have earned a reputation for delivering exceptional results.

Don’t let a sagging ceiling diminish the beauty and comfort of your home any longer. Contact Apex Plasterers Toowoomba today to schedule a consultation or inquire further about our services. Let us restore the safety and charm of your ceiling, providing you with a home you can enjoy for years to come.

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What is gyprock? How important is it?

gyprock plasterboard

Gyprock, a brand synonymous with quality plasterboard, has become a staple in the construction industry, offering a versatile solution for walls and ceilings in both residential and commercial settings. This article delves into the essence of Gyprock, exploring its composition, applications, and distinguishing it from similar materials like drywall.

What is Gyprock?

Originating from its key component, gypsum, it is a brand name that has become almost generic for plasterboard in certain regions. Gypsum, a soft sulfate mineral, is combined with either paper or fiberglass to produce a plasterboard that is both durable and reliable. The manufacturing process involves cutting the plasterboard into various sizes and thicknesses, catering to diverse construction needs.

Composition and Manufacture

At its core, this type of plasterboard is made by embedding gypsum between layers of paper or fiberglass, resulting in a material that is easy to work with and adaptable to various construction requirements. This method of production ensures that Gyprock boards are not only strong but also lightweight, making them an ideal choice for a wide range of applications.

Applications and Benefits

Gyprock plasterboard is primarily used as a lining material for walls and ceilings. Its ease of installation makes it a preferred choice for both new builds and renovation projects. Among its notable properties are fire resistance, sound insulation, and cost-effectiveness, which make Gyprock a go-to material for builders and contractors. Moreover, its versatility allows for easy cutting, drilling, and shaping, enabling custom designs and applications.

It comes in various forms, including fire-rated, moisture-resistant, and sound-proof options, each tailored to meet specific construction requirements. This adaptability makes it suitable for a wide array of environments, from residential homes to commercial buildings.

Gyprock vs Drywall: Clarifying the Confusion

A common question arises regarding the distinction between Gyprock and drywall. While both terms refer to plasterboard, there are subtle differences worth noting.

Brand and Geography

Gyprock is a trademarked brand owned by CSR Limited, predominantly available in Australia and New Zealand. It represents a specific range of plasterboard products known for their quality and performance.

On the other hand, drywall is a generic term used primarily in North America and other parts of the world to describe plasterboard used in construction. Drywall can be manufactured by various companies, each with its unique formulations and product offerings.

Similarities and Differences

Both Gyprock and drywall share the same foundational material – gypsum – combined with paper or fiberglass. They are utilized in similar applications, such as constructing walls and ceilings, and offer comparable benefits like ease of installation, fire resistance, and sound insulation.

The principal distinction lies in the branding and regional availability. It is a specific brand available in certain markets, while drywall is a more universally recognized term for similar plasterboard products.

It has cemented its position as a fundamental material in the construction industry, offering a blend of durability, versatility, and cost-effectiveness. Whether it’s for a new construction project or a renovation, it provides a reliable solution for creating walls and ceilings. Understanding the nuances between Gyprock and drywall can aid in making informed decisions for your construction needs, ensuring that you choose the right material for the right application.



What is Gyprock used for?

It is a plasterboard that is commonly used as a lining material for walls and ceilings in both residential and commercial construction. It is an easy to install, fire-resistant, sound-insulating, and cost-effective solution for both new construction and renovation projects.


How is Gyprock made?

It is made by combining gypsum with paper or fiberglass to create a strong and durable building material. The plasterboard is then cut into sheets of various sizes and thicknesses to suit different applications.


Can Gyprock be used for shower recesses?

Yes, it can be used for shower recesses, but a moisture-resistant type of Gyprock should be used in these areas to prevent water damage.


Can Gyprock be painted?

Yes, it can be painted. It is recommended to wait at least 24 hours after installation before painting, and to use a paint that is suitable for use on plasterboard.


Can I hang things on Gyprock walls?

Yes, the walls can be used to hang things on, but it is important to use the correct type of wall anchors and to ensure they are properly installed to support the weight of the item you are hanging.


Is Gyprock fireproof?

It is not fireproof, but it is fire-resistant, meaning it can slow down the spread of fire. There are also fire-rated products available that have better fire resistance.


How long does it take for Gyprock to dry?

The drying time will depend on the thickness of the plasterboard, the humidity and temperature of the environment, and the type of jointing compound used. Typically, it takes at least 24 hours for it to dry completely.


Can I use plasterboard around a fireplace?

Plasterboard is not suitable near an open fire or subjected to temperatures exceeding 52ºC for prolonged periods.


Can I hang a heavy mirror on a plasterboard wall?

Many walls in modern homes are very sturdy and often take the weight of heavy plasma TV screens, artwork and mirrors. Large, heavy items should only ever be supported and attached to the structural studs inside the walls. Only lightweight items such as small pictures and artworks can be hung from the plasterboard only.


Are plasterboard and Gyprock the same thing?

Gyprock is also known as gypsum board, drywall, or plasterboard.


Can you use picture hooks on plasterboard?

Providing the plaster is in good condition, and if you have a lightweight picture, then a simple two-pin picture hook will suffice. It’s possible to hang a heavier picture into plasterboard that’s in good condition if you use the correct fixing, such as a hollow wall anchor or a self-drill screw. Heavy items such as large mirrors and picture frames should be hung from the inner studs inside the walls.


Should wet plasterboard be replaced?

Generally, yes. The board should be removed and replaced with an equivalent Gyprock product to maintain the original performance criteria.

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Soundproof Plastering: Enhancing Serenity at Home & Work

Soundproof Plastering

In today’s bustling world, the tranquility of our living spaces is more valuable than ever. Homeowners and tenants across Australia are increasingly seeking solutions to mitigate unwelcome noise within their homes. Plasterboard, widely recognised as drywall or gypsum board, emerges as a frontrunner in the realm of soundproofing walls, ceilings, and floors. This article delves into the myriad plasterboard, soundproof plastering techniques and guides you on incorporating them into your abode.

Unveiling Plasterboard Soundproofing Techniques

Thicker Plasterboard: A Primary Defence Utilising thicker plasterboard is a straightforward yet effective strategy to curtail sound transmission. The added mass provides a robust barrier against noise, making it a preferred choice for many.

Integrating Soundproof Plastering Materials

Another innovative approach involves layering soundproofing materials between the plasterboard and the existing structures. Options abound, from fibreglass insulation and acoustic foam to mineral wool, each offering unique benefits in dampening sound vibrations.

Specialised Soundproof Plasterboard

For those seeking a more tailored solution, specialised plasterboard with inherent soundproofing capabilities is available. Although this option might come at a premium, its efficacy in noise reduction is unmatched.

Implementing Plasterboard Soundproofing

The installation process mirrors that of standard plasterboard, beginning with the removal of outdated materials. Precisely cut plasterboard is then affixed to the desired surface. Ensuring all gaps and fissures are meticulously sealed with soundproof sealant is crucial to prevent any sound leakage. The final step involves finishing the surface with paint or wallpaper, seamlessly integrating it into the room’s aesthetic.

Weighing the Pros and Cons

– Cost-effective and straightforward installation
– Aesthetically pleasing, blending effortlessly with existing structures
– Suitable for both new constructions and renovations

– Limited efficacy against high-frequency sounds
– Potential incompatibility with already thick walls or ceilings

Plasterboard soundproofing stands out as a viable solution to enhance the peacefulness of your home. Whether opting for thicker boards, integrating additional soundproofing layers, or investing in specialised products, these methods pave the way for a quieter living environment. However, it’s vital to acknowledge the inherent limitations of plasterboard soundproofing and explore alternative solutions for comprehensive noise reduction. 

For further guidance, do not hesitate to reach out to our team or consult with soundproofing experts. Together, we can transform your home into a haven of tranquility amidst the chaos of the external world.


How does soundproof plastering work?

It works by using specialized materials and techniques to create a barrier between the inside of a room and the outside noise sources. This barrier helps to block or absorb sound waves, reducing the amount of noise that enters the room.


Is soundproof plastering effective at reducing noise transmission?

It can be effective at reducing noise transmission, depending on the materials used, the thickness of the plastering, and the level of noise reduction desired. It is important to note that it is not a perfect solution, and it may not completely eliminate all noise transmission.


What materials are used in soundproof plastering?

It can be made from a variety of materials such as mass-loaded vinyl, acoustic insulation, and sound-absorbing foam. These materials are chosen based on their sound-blocking and sound-absorbing properties.


How is soundproof plastering applied?

It is applied in a similar way to regular plastering, but with the addition of specialized materials and techniques. The walls or ceilings are first prepared and any existing plaster is removed. Then, the soundproofing materials are applied, followed by the plaster layer.


How much does soundproof plastering cost?

The cost can vary depending on the materials used, the size of the area to be covered, and the level of noise reduction desired. On average, it can cost between $2-$4 per square foot.


How long does soundproof plastering take to dry?

The drying time can vary depending on the materials used, the thickness of the plastering, and the ambient temperature and humidity. Typically, it takes around 24 hours for the plaster to dry.


Can soundproof plastering be used on both walls and ceilings?

Yes, it can be used on both walls and ceilings.


Is soundproof plastering suitable for both new construction and retrofitting existing structures?

It can be used in both new construction and retrofitting existing structures. It is important to note that retrofitting existing structures may be more difficult and may require more extensive preparation.


What is the sound reduction rating of soundproof plastering?

The sound reduction rating can vary depending on the materials used and the thickness of the plastering. On average, it can have a sound reduction rating of between 25-35 decibels.


Is soundproof plastering fireproof?

It depends on the materials used. Some materials used may be fireproof, while others may not. It is important to check with the manufacturer or supplier to confirm whether it is fireproof or not.

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Adding New Plasterboard To Walls and Ceilings

new plasterboard

Are you considering giving your space a fresh new look or starting a renovation project that involves installing new plasterboard on walls and ceilings? If so, you’ve come to the right place! Plasterboard is a versatile and popular choice for interior walls and ceilings due to its smooth finish and ease of installation. In this article, we’ll walk you through the entire process, from preparation to the finishing touches, ensuring that you’re well-equipped to tackle your plasterboard project with confidence.

Preparation: Setting the Stage for Success

apex plasterers toowoombaThe journey to transforming your walls and ceilings begins with thorough preparation. This critical first step involves clearing the area of any existing walls, surfaces, or obstructions. It’s essential to create a clean slate, which may include removing old plaster, wallpaper, or any fixtures that are in the way. Next, it’s time to ensure everything is level and sturdy. This might involve some minor adjustments or the installation of new framing or support structures to provide a solid foundation for your plasterboard. The goal here is to create a stable and level surface that will support your new walls and ceilings flawlessly.

Measuring and Cutting: Precision is Key

With your area prepped and ready, the next step is to measure and cut your plasterboard sheets to fit perfectly. This stage requires careful attention to detail, as accurate measurements are crucial for a seamless finish. Using a cutting knife or saw, trim the plasterboard sheets, taking into account the spacing for joists and any electrical or plumbing installations that need to be integrated. Remember, measure twice and cut once to ensure precision!

Installing the New Plasterboard: Bringing Your Walls to Life

apex plasterers toowoombaNow comes the exciting part – bringing your walls and ceilings to life with plasterboard. Start by securely attaching the cut sheets to the framing using screws, ensuring they are level and flush with each other. This step is all about precision, as a smooth, even surface is key to a professional-looking finish. It’s important to install any electrical or plumbing fixtures before the plasterboard sheets are fitted. This ensures that everything is neatly incorporated and accessible once the plasterboard is in place.

Finishing Touches: Creating a Flawless Surface

With the plasterboard installed, it’s time to focus on the finishing touches. This stage involves applying joint compound (or “mud”) to the seams and screw heads, creating a smooth, uniform surface. Once the compound dries, sand the area to eliminate any imperfections, leaving you with a ready-to-paint surface that’s as smooth as silk.

Inspecting and Testing: Ensuring Perfection

Before you break out the paintbrushes, take a moment to inspect your work. Check for any cracks, gaps, or imperfections that need addressing. It’s crucial that your new walls and ceilings not only look great but also meet all relevant standards and codes.

Clean-Up: Leaving No Trace Behind

apex plasterers toowoombaThe final step in your plasterboard installation journey is clean-up. This involves removing all debris, dust, and tools from the work area, leaving your space clean and ready for the next phase of your project, whether that’s painting, decorating, or simply enjoying your newly transformed room. Installing new plasterboard on walls and ceilings can dramatically transform the look and feel of your space. By following these steps, you’re well on your way to achieving a professional-quality finish. Remember, every great project starts with solid preparation, and attention to detail is key at every stage. Whether you’re a seasoned DIY enthusiast or a newcomer to plasterboard installation, we’re confident that you’ll find the process rewarding and the results impressive.


What are the benefits of adding new plasterboard to walls and ceilings?
Adding new plasterboard can improve the insulation, fire resistance and soundproofing of a room. It can also provide a smooth, even surface for painting or wallpapering, and can be used to repair or cover up existing damage to walls and ceilings.

Can I install new plasterboard over old plasterboard?
It is generally not recommended to install new plasterboard over old plasterboard, as it can cause issues with uneven surfaces and can make it difficult to properly secure the new plasterboard to the wall or ceiling.

How do I cut plasterboard to size?
Plasterboard can be cut to size using a sharp utility knife or a plasterboard saw. When cutting plasterboard, it is important to use a straight edge as a guide to ensure a clean, straight cut.

How do I secure plasterboard to walls and ceilings?
Plasterboard is typically secured to walls and ceilings using drywall screws or nails. It is important to space the fasteners evenly and to drive them flush with the surface of the plasterboard to avoid creating lumps or bumps.

How do I finish the joints between plasterboard sheets?
The joints between plasterboard sheets are typically finished using joint tape and joint compound. The tape is applied to the joint and then the compound is spread over the tape and the surrounding area. Once dry, the compound is sanded smooth to create a seamless finish.

How long does it take for plasterboard to dry?
The drying time for plasterboard can vary depending on the humidity and temperature of the room, but it typically takes around 24 hours for the plasterboard to dry.

Can I paint or wallpaper over new plasterboard?
Yes, once the plasterboard is dry, it can be painted or wallpapered over. It is recommended to prime the plasterboard before applying paint or wallpaper.

Can I install new plasterboard on my own or do I need a professional?
While it is possible to install new plasterboard on your own, it can be a time-consuming and difficult task. It is recommended to hire a professional for best results.