What is insulated plasterboard?
Insulated plasterboard, also known as insulation backed plasterboard, is a composite board made by bonding a layer of plasterboard to rigid insulation. It is designed to improve thermal performance while providing a ready-to-finish internal surface.
What is insulated plasterboard used for?
Insulated plasterboard is used to line internal walls and ceilings where improved insulation is required. It is commonly used on solid walls, external walls, and ceilings to help reduce heat loss and improve energy efficiency.
It is widely used in both refurbishment projects and new builds where internal insulation is needed without building out full stud systems.
Understanding insulated plasterboard thickness
Insulated plasterboard thickness refers to the total board size, which includes both the plasterboard and the insulation layer. The plasterboard itself is typically 12.5mm thick, with the remaining thickness made up of insulation.
- 37.5mm board = 25mm insulation + 12.5mm plasterboard
- 52.5mm board = 40mm insulation + 12.5mm plasterboard
- 62.5mm board = 50mm insulation + 12.5mm plasterboard
- 72.5mm board = 60mm insulation + 12.5mm plasterboard
Choosing the correct thickness depends on the level of thermal performance required and the available space.
Why use plasterboard with insulation?
- Improves thermal performance of walls and ceilings
- Combines insulation and plasterboard in one board
- Reduces installation time compared to separate systems
- Suitable for both new build and refurbishment projects
This makes insulated plasterboard a practical solution where space and efficiency are important.
Fixing insulated plasterboard
Insulated plasterboard can be installed using methods such as dot and dab adhesive fixing or mechanical fixings, depending on the wall type and specification. Proper fixing is essential to ensure performance and long-term durability.
Always follow manufacturer guidance and building regulations when installing insulated boards.
Insulated plasterboard vs standard plasterboard
Standard plasterboard provides a finish surface but does not offer insulation. Insulated plasterboard combines both functions, allowing improved thermal performance without the need for separate insulation layers.
This makes it a preferred option where internal insulation is required without increasing wall build-up significantly.
Common mistakes when using insulated plasterboard
- Confusing overall thickness with insulation thickness
- Using insufficient thickness for required thermal performance
- Incorrect fixing method for the wall type
- Not sealing joints properly
Correct specification and installation are essential to achieve the intended performance.
FAQs
What is insulated plasterboard?
Insulated plasterboard is a composite board made from plasterboard bonded to insulation. It is used to improve thermal performance while providing a ready-to-finish internal surface.
What thickness insulated plasterboard do I need?
The required thickness depends on the level of insulation needed. Common sizes include 37.5mm, 52.5mm, 62.5mm and 72.5mm, with the insulation layer making up the total thickness minus the 12.5mm plasterboard.
Can you dot and dab insulated plasterboard?
Insulated plasterboard can be installed using dot and dab adhesive on suitable surfaces, although mechanical fixings may also be required depending on the application and specification.
Is insulated plasterboard good for soundproofing?
Insulated plasterboard primarily improves thermal performance. While it may offer some sound reduction, dedicated acoustic systems are typically required for effective soundproofing.
Where is insulated plasterboard used?
Insulated plasterboard is commonly used on internal walls and ceilings, particularly on solid walls or external walls where improving thermal efficiency is a priority.