The ultimate how to guide for Installing Insulated Plasterboard in 2024

The ultimate how to guide for Installing Insulated Plasterboard in 2024

Insulated plasterboard is becoming a go-to choice for builders, renovators, and DIY enthusiasts aiming to improve their home's thermal efficiency and comfort. At its core, this material is a smart hybrid of traditional plasterboard coupled with insulation material, designed to offer the best of both worlds: a smooth finish for walls and ceilings, with the added benefit of thermal insulation. This blog will guide you through the essential steps and considerations for installing insulated plasterboard across various parts of your home, ensuring you're well-equipped to make your living space more energy-efficient and comfortable.

Whether you're planning to upgrade your walls, loft, or ceilings; understanding the right approach and benefits of insulated plasterboard can significantly impact your project's success. By demystifying the process and highlighting key takeaways, this guide aims to arm you with knowledge, ensuring that your installation goes smoothly.

But first, let's dive into the world of insulated plasterboard, exploring its benefits, types, and application methods, and learn how to install it effectively for a warmer, more efficient home.


    What is Insulated Plasterboard?

    Insulated plasterboard combines convenience and efficiency, serving as a pivotal material in modern construction and renovation projects. It essentially marries a layer of plasterboard to a layer of insulation, resulting in a composite material that offers both a smooth surface and significant thermal insulation properties. This innovation not only streamlines the installation process by combining two steps into one but also significantly enhances a building's energy efficiency.

    What are the Benefits of Using Insulated Plasterboard?

    • Enhanced Thermal Efficiency: Insulated plasterboard significantly reduces heat loss through walls and ceilings, making your home warmer in the winter and cooler in the summer.
    • Cost Savings: By improving thermal efficiency, it reduces the need for heating and cooling, leading to lower energy bills.
    • Ease of Installation: It offers a simpler, faster installation process compared to applying insulation and plasterboard separately.
    • Improved Interior Comfort: Enhances the overall comfort of living spaces by maintaining consistent indoor temperatures and reducing drafts.
    • Versatility: Suitable for a variety of applications, including new builds, renovations, and retrofit projects.

    Insulated plasterboard vs traditional plasterboard

    The traditional plasterboard has been a staple in construction for decades, appreciated for its simplicity and effectiveness. However, as the demand for more energy-efficient and eco-friendly materials grows, insulated plasterboard has gained popularity. This innovative solution incorporates a layer of insulation material, usually foam, bonded to the plasterboard, enhancing the thermal performance of walls and ceilings without compromising space.

    Key comparisons

    • Insulation Efficiency: Insulated plasterboard offers superior thermal insulation compared to traditional plasterboard, making it ideal for energy-saving renovations.
    • Cost Consideration: While insulated plasterboard may have a higher upfront cost, its long-term savings on energy bills can justify the investment.
    • Installation Ease: Traditional plasterboard is generally easier and quicker to install, but insulated plasterboard isn't far behind, especially with the right tools and techniques.
    • Environmental Impact: Choosing insulated plasterboard can significantly reduce a building's carbon footprint by minimizing the need for heating and cooling.
    • Space Saving: Insulated plasterboard combines insulation and wallboard into one, saving valuable space compared to traditional methods that require separate installations.

    What Type of Insulated Plasterboard Should I Use?

    EPS (Expanded Polystyrene), PIR (Polyisocyanurate), and HP+ (High Performance Plus) Insulated Plasterboards are key choices for insulation, each serving different needs.

    EPS Insulated Plasterboard offers cost-effective, moderate insulation for budget-sensitive projects, ideal for residential retrofits where minimal additional wall thickness is needed.

    HP+ Insulated Plasterboard provides enhanced thermal performance, plus moisture, and fire resistance. It is suitable for areas where a thicker board can be accommodated, matching PIR's performance cost-effectively.

    PIR Insulated Plasterboard stands out for high thermal efficiency and fire resistance, perfect for spaces requiring maximum insulation performance with minimal material thickness, such as new constructions and renovations focused on space conservation and strict thermal standards.

    Phenolic Insulated Plasterboard is the most thermally efficient insulation, achieving a consistent 0.019 W/mK across all thicknesses, ensuring outstanding insulation. As one of the thinnest Internal Wall Insulation (IWI) solutions, phenolic insulated plasterboard is perfect for projects where maintaining internal space is crucial.

    Specialised boards cater to moisture or fire risks, with moisture-resistant types crucial for wet areas to prevent mould, and fire-resistant varieties offering added safety.

    Selecting the right board depends on project needs like thermal performance, budget, and space, ensuring a safe, comfortable, and energy-efficient outcome. For detailed guidance on selecting the appropriate type of insulated plasterboard for your project, refer to our comprehensive blog post on types of insulated plasterboard.

    Where Can I Install Insulated Plasterboard?

    Insulated plasterboard can be installed in various parts of a building to improve thermal efficiency and finish surfaces. Key areas include:

    • Walls: Either directly attached to brick or block walls using the dot and dab method or fixed to timber or metal stud frameworks.
    • Loft Rafters: Installed to insulate and finish the underside of roof rafters, enhancing the thermal performance of loft spaces. Especially beneficial for loft conversions.
    • Ceilings: Applied to ceilings to provide insulation from above and a smooth surface below.

    Dot and Dab vs Timber Stud

    When it comes to installation on walls, the choice between dot and dab and timber battens for fitting insulated plasterboard is a significant decision in construction and renovation projects, impacting thermal performance, installation time, cost, and suitability for various types of walls. Here's a comparison based on common aspects:

    Dot and Dab vs Timber Stud: Installation Method Comparison

    • Dot and Dab: This method involves applying adhesive dabs to the wall at strategic points and then pressing the insulated plasterboard into place. It's a relatively quick process, often used for attaching plasterboard to solid walls.
    • Timber Battens: This involves fixing wooden battens to the wall and then screwing the plasterboard to these battens. It can accommodate additional insulation between the battens and allows for a void where services can be run.

    Dot and Dab vs Timber Stud: Thermal Performance Comparison

      • Dot and Dab: Can create small air gaps between the wall and the board, which might slightly reduce thermal performance unless perfectly executed. However, insulated plasterboard itself adds significant thermal resistance.
      • Timber Battens: Allows for the addition of extra insulation between the battens, potentially enhancing thermal performance. The wood itself has an insulating effect, but the method might introduce thermal bridging through the battens, slightly reducing effectiveness.

      Dot and Dab vs Timber Stud: Sound Insulation Comparison

        • Dot and Dab: Provides reasonable sound insulation due to the solid adhesion of the boards to the wall, reducing the space for sound to travel.
        • Timber Battens: Can offer superior sound insulation if additional acoustic insulation is placed between the battens, but this depends on the overall wall construction.

        Dot and Dab vs Timber Stud: Damp Issues Comparison

          • Dot and Dab: Can be susceptible to damp issues if there's any moisture in the wall, as there's less space for air circulation behind the boards.
          • Timber Battens: Allows air to circulate behind the insulation, reducing the risk of damp and mould, especially if a vapor barrier is used.

          Dot and Dab vs Timber Stud: Suitability and Flexibility Comparison

            • Dot and Dab: Best suited for solid walls where drilling and fixing can be more challenging. Less flexible for later adjustments or adding services.
            • Timber Battens: More versatile, as it allows for the easy addition of services such as electrical wiring and plumbing behind the boards. Suitable for both solid and stud walls.

            Dot and Dab vs Timber Stud: Cost and Labour Comparison

              • Dot and Dab: Generally, quicker and requires less labour, which can make it cost-effective in terms of installation. However, the cost of adhesive can affect overall costs.
              • Timber Battens: The material cost for timber and additional insulation might be higher, but this method can save on heating costs in the long term.

              Dot and Dab vs Timber Stud: Pro's and Cons Conclusion

              The choice between dot and dab and timber battens for installing insulated plasterboard largely depends on the specific requirements of your project, including considerations for thermal and sound insulation, potential for damp, cost, and the need for flexibility for services. Timber battens might offer a more versatile and potentially higher-performing solution but at a higher initial cost. Dot and dab can be quicker and more cost-effective initially but might have limitations in terms of thermal performance and flexibility.

              How to install insulated plasterboards

              Installation Tips for Optimal Results:

              • Preparation is Key: Ensure surfaces are dry and stable before beginning. Address any moisture risks by opting for mechanical fixing methods where necessary.

              • Consider the Environment: Given its unsuitability for certain wall types, carefully assess the structure of your building to determine the best approach for installing insulated plasterboard.

              • Follow Best Practices: For the best thermal results and to minimise the disadvantages, it's essential to adhere to recommended procedures and techniques during installation.

              How to install insulated plasterboard onto walls: Dot and Dab

              Installing insulated plasterboard using the dot and dab method is a popular choice for enhancing the thermal efficiency of buildings. This technique is particularly suited for brick, block, concrete cavity, or rendered solid walls that are dry, stable, and free from moisture penetration.

              When should I use this method for installing insulated plasterboard?

              • External Walls: Suitable for brick, block, concrete cavity, or rendered solid walls that are dry and stable.
              • Internal Partitions: Both wooden and masonry internal partitions

              Important Considerations:

              It's crucial not to use this method on external walls at risk of moisture penetration or those made from timber or steel frame constructions. In such cases, moisture penetration from outside poses a significant risk, and mechanically fixing wooden battens followed by screwing the plasterboard to the battens is advisable. We recommend 3 secondary fixings per board, this not only helps with the bonding process but also increases safety as in case of a fire the boards would not come off the wall and block exits.

              Pros and Cons of using Dot and Dab

              Pros of Dot and Dab

              • Thermal Comfort: Walls feel warmer to the touch, improving the internal comfort of a building.
              • Versatility: Can be applied to a wide range of wall types, including internal solid partitions and ceilings.

              Cons of Dot and Dab

              • Messy Process: The need to mix adhesive adds a level of messiness and complexity to the job.
              • Limited Application: Not suitable for walls at risk of moisture penetration or for timber or steel frame constructions due to the potential for moisture issues.

              How to install

              Installing Insulated Plasterboard using Dot and Dab: Materials and Tools Needed

              • Insulated plasterboard panels
              • Drywall adhesive (suitable for dot and dab application)
              • Tape measure
              • Spirit level
              • Plasterboard saw or utility knife
              • Trowel or plasterboard adhesive applicator
              • Straight edge or long ruler
              • Pencil or chalk line
              • Dust mask and safety glasses

              Installing Insulated Plasterboard using Dot and Dab: Preparation

              1. Measure and Plan: Calculate the amount of insulated plasterboard and adhesive you'll need. Accounting for features that may require custom cuts, for example doorways, windows, etc.
              2. Prepare the Wall: Make sure the wall is clean, dry, and free of any debris or loose material. Strip away any existing wallpaper and repair significant damage such as large holes or cracks. Masonry walls tend to absorb moisture, so you need to prepare them properly to prevent moisture causing the adhesive to loose effectiveness. Applying a mixture of PVA and water can block moisture absorption; but make sure to adhere to the manufacturer's mixing guidelines.

              Installing Insulated Plasterboard using Dot and Dab: Installation

              1. Board sizing: While waiting for wall preparations to dry, measure and cut your plasterboard. Starting from one corner of the wall, plot out the placement of each board. For standard walls, minimal trimming is usually needed. For cuts around windows or doors, measure the distance from the adjacent board, mark the plasterboard accordingly, lay it flat on the ground, and then cut along a straight edge marked with a spirit level using a Stanley knife.
              2. Cutting for Fixtures: For areas around windows, doors, or electrical outlets, measure and cut the plasterboard to fit. It's easiest to do this before attaching the board to the wall.
              3. Layout Planning: After the PVA is completely dry, mark the wall to indicate the placement of each board. Use a tape measure and level to outline the top and sides of each panel on the wall – you can use these guides to plan the placement of adhesive dots.
              4. Mixing Adhesive: Mix the drywall adhesive following the manufacturer's instructions. Its important to make sure it has the right consistency for the dot and dab method, a good guide is that it is thick enough to hold its shape when applied. If the mix is too runny, add a bit more adhesive. If it's too thick, add water.
              5. Applying Adhesive Dabs: Apply the adhesive dabs in a grid layout on the wall, spacing them about 250mm apart both vertically and horizontally. The quantity of adhesive you apply should be based on the weight of the plasterboard, lighter boards such as a thinner EPS insulated plasterboard will need less adhesive, where as heavier, thicker boards will need more adhesive to support the weight of the insulated plasterboard. If the wall is uneven, you can apply more adhesive in the low spots to straighten the boards.
              6. Attaching the Plasterboard: Align and press the plasterboard against the adhesive dabs, using a spirit level to ensure it is perfectly vertical, adjusting as needed before the adhesive sets. The first board you install is the most important as it sets the standard for the rest of your boards, so keep your levelling tool close while you are installing!
              7. Repeat the Process: Attach the next panel as close as possible to the first, ensuring minimal gaps between the boards and use the level to make sure the boards are aligned. Repeat this process until all boards are installed. They will then need to be left to set for 24 hours to allow the adhesive to dry, bonding the insulated plasterboard to the wall.
              8. Sealing Gaps: Once all panels are in place, fill any gaps between them with joint compound or caulk, smoothing it out for a seamless finish.
              Installing Insulated Plasterboard using Dot and Dab: Finishing
              1. Taping Joints: Apply joint tape over the seams between the boards, then cover with joint compound. Let it dry according to the product's instructions, then sand smooth.
              2. Final Preparations: Check for any imperfections or rough areas, applying additional joint compound if needed, and sanding down for a smooth finish.
              3. Decorating: Your wall is now ready for plastering or skimming, then painting, wallpapering, or any other finishing touches you have in mind.
              Top Tips
              • Make your dabs bigger as you go down. The lower parts of your plasterboard usually take on more weight.
              • Use offcuts of plasterboard on the floor to keep a gap at the bottom.
              • Keep a damp cloth handy to clean off excess adhesive before it sets.
              • Make sure there is no electrical wiring or plumbing where you will be applying the adhesive dabs and plasterboard.
              • It's essential to check the manufacturer's instructions for both the adhesive and the insulated plasterboard for any specific requirements or recommendations.

              How to install insulated plasterboard onto walls: Timber Studs

              The installation of insulated plasterboard onto timber battens is a refined method to enhance the thermal insulation of buildings while ensuring structural integrity and moisture management. This approach is particularly good for interior renovations and in situations where dot and dab may not be suitable, such as in timber or steel-framed constructions, or when additional space for running utilities is required.

              When should I use this method for installing insulated plasterboard?

              • Timber and Steel Frame Constructions: Ideal for buildings with timber or steel frames where attaching directly to the wall surface is not possible or advisable due to structural considerations.
              • External Walls with Moisture Risks: Provides a reliable solution for external walls where moisture ingress is a potential issue, offering a cavity space for air circulation and moisture control.
              • Internal Renovations: Excellent for renovations where additional services (e.g., electrical wiring, plumbing) need to be incorporated behind the plasterboard.

              Important Considerations

              • Moisture Management: Ensure that there is adequate ventilation in the cavity to prevent condensation. A vapour barrier may be necessary depending on the specific construction and climate conditions.
              • Structural Support: The timber battens must be securely fixed to the structural elements of the building to provide a stable framework for the plasterboard.

              Pros and cons of installing insulated plasterboard to a stud

              Pros of installing insulated plasterboard to a stud

              • Improved Insulation: Allows for the inclusion of additional insulation materials between the battens, further enhancing thermal or acoustic performance.
              • Flexibility in Services: Provides a convenient void for running electrical cables, plumbing, and other services without affecting the wall's thermal performance.
              • Enhanced Moisture Control: The cavity between the plasterboard and the wall can help manage moisture through ventilation, reducing the risk of condensation and mould growth.

              Cons of installing insulated plasterboard to a stud

              • Complex Installation: More labour-intensive than the dot and dab method due to the need for precise batten installation and additional steps for moisture and thermal management.
              • Reduced Room Size: The addition of battens and insulation materials can slightly reduce the internal dimensions of the room.
              • Moisture Management Requirement: Without proper ventilation in the cavity, there is a risk of condensation, which requires careful planning and installation to mitigate.

              How to install

              Installing Insulated Plasterboard to a Timber Stud: Materials and Tools Needed

              • Insulated plasterboard panels
              • Timber battens (treated for interior use)
              • Screws suitable for timber
              • Plasterboard adhesive (optional)
              • Tape measure
              • Level
              • Electric drill/screwdriver
              • Saw (if battens need cutting to size)
              • Utility knife (for cutting plasterboard)
              • Pencil or chalk line

              Installing Insulated Plasterboard to a Timber Stud: <>Preparation

              1. Measure Your Space: Determine the amount of insulated plasterboard and timber battens you'll need by measuring the wall area you plan to cover.
              2. Purchase Materials: Buy the required materials based on your measurements.
              3. Prepare the Wall: Ensure the wall is clean, dry, and free from any protrusions. If installing over an existing wall covering, check for damp issues and resolve them beforehand.
              4. Cut Timber Battens: If necessary, cut your timber battens to the required lengths. Typically, battens are installed vertically, 400mm to 600mm apart, depending on the width of your plasterboard.

              Installing Insulated Plasterboard to a Timber Stud: Installation of the battens

              1. Mark the Wall: Use a level and pencil or chalk line to mark where you'll fix the battens on the wall. This is crucial for keeping the wall straight and providing a flat surface for the plasterboard.
              2. Install the Timber Battens: Secure the battens to the wall studs or masonry using screws. Ensure each batten is level as you go. Leave a small gap at the bottom of the wall to prevent moisture getting up into the battens.

              Installing Insulated Plasterboard to a Timber Stud: Installing the insulated plasterboard

              1. Dry Fitting: Before permanently attaching the plasterboard, dry fit the panels against the battens to ensure they fit properly and make any necessary adjustments.
              2. Cutting Insulated Plasterboard: If you need to cut the plasterboard to fit around windows, doors, or electrical outlets, use a utility knife and straight edge. Score the plasterboard deeply on one side, then snap it back and cut through the paper on the other side.
              3. Applying Adhesive (Optional): For an additional layer of adhesion, apply adhesive to the battens. This step is optional but can help with thermal bridging and soundproofing.
              4. Fixing the Plasterboard: Start from one corner and work your way across the wall. Attach the plasterboard to the battens using screws. Ensure screws are countersunk but do not tear the paper facing. The boards should fit snugly together with minimal gaps.
              5. Sealing Gaps: Use plaster or caulk to seal any gaps between the boards and around the edges of the wall. This helps prevent air leakage and improves insulation.

              Installing Insulated Plasterboard to a Timber Stud: Finishing Touches

              1. Taping Joints: Once all the boards are installed, tape the joints with joint tape and apply a joint compound. Smooth it out and let it dry according to the product instructions, then sand it smooth.
              2. Final Check: Go over the wall to check for any missed screws or imperfections. Make any necessary adjustments or touch-ups.
              3. Wall covering: Once everything is dry and smooth, your wall is ready for plastering or skimming, then painting, wallpapering, or any final finish you prefer.


              • Always check for electrical wires and plumbing before drilling into walls.
              • Wearing safety gear, like gloves and eye protection, is recommended during cutting and installation.
              • Consider the room's humidity and choose insulation materials accordingly.
              • Ensure there's adequate ventilation in the room to prevent condensation issues with the new insulated walls.

              How to install insulated plasterboard onto loft rafters

              Installing insulated plasterboard to loft rafters not only enhances your homes thermal performance, it also creates a finished look suitable for loft conversions or storage space.

              Installing insulated plasterboard to loft rafters: Materials and Tools Needed

              • Insulated plasterboard panels
              • Timber battens (optional, for creating a counter batten system)
              • Alkaline resistant long screws and washers suitable for the thickness of the plasterboard and any additional battening
              • Sealant or expanding foam insulation (for gaps and edges)
              • Tape measure
              • Electric drill/screwdriver
              • Handsaw or circular saw (if cutting timber battens)
              • Utility knife (for cutting plasterboard)
              • Pencil or marker
              • Spirit level
              • Adhesive (optional, if using in combination with screws for extra adhesion)

              Installing insulated plasterboard to loft rafters: Preparation

              1. Inspect and Measure: Check the condition of your loft rafters and the roof space. Measure the distances between rafters and the length of the rafters to estimate how much plasterboard and how many battens you'll need.
              2. Material Acquisition: Purchase the required insulated plasterboard panels, timber battens (if using), screws, washers, and any other materials based on your measurements.
              3. Loft Preparation: Clear the loft space as much as possible. Ensure there is adequate lighting and ventilation.
              4. Planning and Marking: Use your tape measure and pencil to mark where the panels will go. If you're using timber battens, mark the rafter locations where the battens will be attached to create a frame for the plasterboard.

              Installing insulated plasterboard to loft rafters: Installation

              1. Fitting Timber Battens (Optional): If you're creating a counter batten system for additional insulation space or to level out the surface, cut your timber battens to length and screw them into the rafters. Ensure they are level and securely fixed.
              2. Cutting Insulated Plasterboard: Measure and cut your insulated plasterboard panels to fit the spaces between rafters or over the battens, leaving a small expansion gap around the edges. Use a utility knife for straight cuts.
              3. Applying Adhesive (Optional): If using adhesive for extra bonding, apply it to the rafters or battens as directed by the product instructions. This step is optional and can be skipped if you prefer to use screws alone.
              4. Fixing Plasterboard to Rafters/Battens: Position the first plasterboard panel against the rafters or battens. Use the drill/screwdriver to fix the panel in place with screws and washers. The washers help distribute the load and prevent the screws from pulling through the plasterboard. Start from the center of the panel and work your way outwards. Ensure the screws are driven just below the surface of the plasterboard but do not break the paper facing.
              5. Repeat for Additional Panels: Continue installing panels, ensuring they are butted tightly together. Use the spirit level to keep everything straight and level.
              6. Sealing Edges and Gaps: Use sealant or expanding foam insulation to fill any gaps between panels and around the edges of the loft space. This step is crucial for maximising the insulation effectiveness.

              Installing insulated plasterboard to loft rafters: Finishing

              1. Taping and Filling Joints: Once all panels are in place, tape the joints with plasterboard joint tape and cover with joint filler. Once dry, sand smooth for a neat finish.
              2. Final Inspection: Check for any missed screws or gaps that need sealing. Ensure the loft space is well-insulated and that there are no air leaks.


              • Wear appropriate safety gear, including gloves and eye protection, when cutting and installing plasterboard.
              • If your loft will be used as a living space, ensure you comply with local building regulations, which may require additional insulation, ventilation, or fire safety measures.
              • Consider the placement of loft lights or electrical outlets before installing the plasterboard, as wiring will need to be done in advance.
              • Inspect the roof space for signs of damp or leaks before starting. Addressing these issues beforehand is crucial to avoid future problems.

              How to install insulated plasterboard to a ceiling

              Installing insulated plasterboard to ceilings is an effective way to improve thermal efficiency and reduce heat loss in a room. This project requires careful planning and precision, but it can be done as a DIY project with the right tools and safety precautions

              Installing insulated plasterboard to a ceiling: Materials and Tools Needed

              • Insulated plasterboard panels
              • Timber battens (if required for fixing to joists)
              • Plasterboard screws
              • Adhesive (optional)
              • Pencil or chalk line
              • Tape measure
              • Spirit level or laser level
              • Electric drill with screwdriver bits
              • Plasterboard saw or utility knife (for cutting plasterboard)
              • Safety glasses and dust mask
              • Ladder or scaffold tower (for safe access to the ceiling)

              Installing insulated plasterboard to a ceiling: Preparation

              1. Safety First: Ensure the room is clear, and you have stable footing, such as a ladder or scaffolding, to safely reach the ceiling. Wear safety glasses and a dust mask.
              2. Measure the Ceiling: Measure the length and width of the ceiling to determine how much insulated plasterboard you'll need. Plan the layout so that joints between boards are staggered and fall on the centerline of ceiling joists or battens.
              3. Prepare the Surface: The ceiling surface should be clean, dry, and free of any protruding nails or screws. Remove any loose plaster or debris.
              4. Mark Joist Locations: Use a stud finder or tap method to locate the ceiling joists and mark their paths with a pencil or chalk line. This is critical for securing the plasterboard properly.

              Installing insulated plasterboard to a ceiling: Installation

              1. Installing Timber Battens (Optional): If the ceiling joists are uneven or you need to create a more level surface, install horizontal timber battens across the joists at 400mm centers. This can also be beneficial for additional insulation space.
              2. Cutting the Plasterboard: Measure and cut your insulated plasterboard to size, allowing for a slight gap around the perimeter for expansion. Use a plasterboard saw or utility knife for cutting. Remember to cut boards so their ends land on a joist or batten.
              3. Cutting for Fixtures: If you need to make cutouts for light fixtures or vents, measure and mark these on the boards before lifting them into place. Cut out the shapes using a plasterboard saw or drill with a hole cutter attachment.
              4. Applying Adhesive (Optional): For an additional bond, especially in areas where screw fixing might be difficult, apply adhesive in dabs across the joists or battens. This method is optional and used in conjunction with screws.
              5. Fixing the First Board: Starting at one corner, lift the first board to the ceiling (this is a two-person job for safety and efficiency). Use a temporary support, like a prop or deadman, to hold the board in place if necessary. Align the board with your joist or batten markings.
              6. Securing the Board: Secure the plasterboard to the joists or battens with plasterboard screws. Start in the center of the board and work outwards. Screws should be placed every 300mm along the joists or battens and 10-15mm from the edge of the board.
              7. Continue Installing Boards: Install the next board, ensuring tight joints between boards. Stagger the joints between rows of boards to increase the strength of the installation. Use a spirit level or laser level to check that the boards are level as you go.

              Installing insulated plasterboard to a ceiling: Finishing

              1. Taping Joints: Once all boards are installed, tape the joints with joint tape and apply joint compound. Smooth it out and allow it to dry according to the manufacturer's instructions.
              2. Final Inspection: Check for any missed screws and ensure all boards are securely fixed. Fill any gaps between the wall and ceiling with caulk to ensure a neat finish and additional air tightness.


              • Always have at least one other person to help when lifting and fixing the plasterboard to the ceiling. This is not only for efficiency but also for safety.
              • Ensure any electrical work needed in the ceiling is completed and tested before covering with plasterboard.

              Safety Considerations

              While the steps provided offer a general guide to installing insulated plasterboard, it's crucial to consult the manufacturer's guidelines for the specific product you're using. Products may have unique requirements or recommendations that ensure their optimal performance and your safety during installation. Always prioritise these instructions to achieve the best results.


              Embracing insulated plasterboard in your construction or renovation project can significantly enhance your home's energy efficiency and comfort. With its dual benefits of insulation and a smooth surface, it presents a practical solution for modern building needs. Whether you're tackling walls, lofts, or ceilings, the key to success lies in choosing the right type of plasterboard, employing the appropriate installation method, and adhering to safety guidelines. As we wrap up this guide, remember that the warmth and efficiency of your home begin with the materials you choose and the care with which you install them. Happy building!


              What is the difference between insulated plasterboard and regular plasterboard? 

              Insulated plasterboard combines a layer of insulation with a plasterboard finish, offering thermal benefits alongside a smooth surface, unlike regular plasterboard which only provides a surface finish.

              Can I install insulated plasterboard myself? 

              Yes, with some DIY skills, you can install insulated plasterboard yourself using this guide. However, it's important to follow the manufacturer's guidelines and local building regulations. Some installations, especially those involving electrical work or affecting the building's structure, might require professional assistance.

              Can insulated plasterboard be used in bathrooms? 

              Yes, but it's important to select a moisture-resistant type of insulated plasterboard for bathrooms to prevent mould growth and deterioration due to humidity.

              Can I install insulated plasterboard over existing wallpaper? 

              It's generally recommended to remove any loose or flaky layers before installing insulated plasterboard for a better adhesion. However, if the existing wallpaper is firmly adhered and smooth, it may be possible to install over it, particularly if using a direct bonding method. Check the manufacturer's guidance.

              What should I do about sockets and switches? 

              Electrical sockets and switches may need to be extended out to accommodate the additional thickness of the insulated plasterboard. You can buy special extension boxes or frames for this purpose. Ensure all electrical work complies with local regulations, and consider hiring a professional electrician for safety.

              Can insulated plasterboard be used on ceilings?

              Yes, insulated plasterboard can be used on ceilings, but it's crucial to ensure that the ceiling structure can support the weight of the board. Mechanical fixing is recommended for ceiling installations.

              How do you cut insulated plasterboard?

              Insulated plasterboard can be cut using a sharp utility knife for the plasterboard layer and a saw for the insulation layer, following safety precautions and manufacturer recommendations.

              Do I need to use a vapour barrier with insulated plasterboard?

              Depending on the specific installation and building requirements, a vapour barrier may be recommended to prevent moisture transfer and ensure optimal thermal performance.

              When is a Vapour Barrier Necessary?

              • Climatic Conditions: In areas with high humidity or significant temperature differences between indoors and outdoors, vapor barriers are more likely to be necessary.
              • Building Construction and Location: The construction type and location of the insulated plasterboard (e.g., external walls, internal walls against unheated spaces) influence the need for a vapor barrier.
              • Type of Insulated Plasterboard: Some insulated plasterboard products come with an integrated vapor barrier. In such cases, additional vapor barriers may not be necessary, depending on the specific product and installation guidelines.

              Types of Vapour Barriers

              • Sheet Materials: Plastic sheets (e.g., polyethylene film) are common vapor barriers. They are applied over the frame before the insulated plasterboard is installed.
              • Coatings: Vapor barrier paints or primers can be applied directly to the surface of the insulated plasterboard or the wall structure itself.
              • Integrated Solutions: Some insulated plasterboards come with an integral vapor barrier, usually a foil backing that acts as a vapor barrier, eliminating the need for a separate installation.

              Can insulated plasterboard be recycled?

              Recycling options vary by location and the materials used in the insulated plasterboard. It's best to consult local recycling guidelines or the manufacturer for specific recycling information.