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Polystyrene Backed Plasterboard

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Insulated plasterboards, pivotal in modern construction, combine the rigidity and finish quality of gypsum plasterboard with the thermal insulation properties of materials like Expanded Polystyrene (EPS) and Extruded Polystyrene (XPS). 

These hybrids aim to streamline the building process by integrating insulation and structural components into one product. EPS and XPS, both derivatives of polystyrene, bring unique characteristics to the table: EPS offers flexibility and cost-effectiveness, while XPS is renowned for its consistent density and moisture resistance. 

When melded with plasterboard, they play a crucial role in enhancing a building's energy efficiency and interior comfort.

Find Out More About Our Types of Polystyrene Insulated Plasterboard
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What Is Polystyrene Backed Plasterboard?

Polystyrene plasterboard is a composite material used in construction that combines the properties of plasterboard (also known as gypsum board or drywall) with a layer of polystyrene foam. 

This fusion aims to deliver the benefits of both materials in a singular product, serving as an insulative and structural element in walls and ceilings.

  • Drylining and insulation built into one product
  • Each board is made to the same high standards, meaning you will always get a clean finish
  • Factory bonded to an polystyrene insulant 
  • Provides an ideal surface for plaster skimming or jointing


Benefits of Polystyrene Insulated Plasterboards

  • All-in-one product – One of the biggest benefits of polystyrene plasterboards is that they save time. Each board is comprised of insulation and gypsum plasterboard drylining in one solid solution. When you choose all-in-one boards, you do not have to spend time sourcing different materials and fitting them together.
  • Tapered edge –  Insulated plasterboard is available in a tapered edge. The tapered finish allows installers to achieve a seamless finish between sheets. 
  • Cost Efficiency – Generally, EPS is less expensive than XPS, making it a cost-effective insulating option for many projects.


Where Can I Install Polystyrene Plasterboards? 

XPS insulation sheets are well-suited for use under concrete floors and in other applications requiring underfloor insulation. They are also versatile enough to insulate cavity walls, rooftops, and exterior walls.

XPS insulation excels in resisting moisture, making it a top choice for insulation in inverted roof setups. Its densely arranged, closed-cell structure ensures minimal impact from moisture.

EPS insulation is crafted for application in both renovations and new constructions, targeting walls, ceilings, and reveals. It offers a very basic level of thermal insulation. 


Polystyrene Backed Plasterboard Thickness

We stock Thermaline basic insulated plasterboard in thicknesses ranging from 22mm, 30mm, and 40mm

You can either install polystyrene plasterboards alone or as part of a build-up of other insulation materials. 

The thickness you choose will be determined by how much space you have available, and the required U-Value of the buildup.

Frequently Asked Polystyrene Insulated Plasterboard Questions

Frequently Asked Polystyrene Backed Plasterboard Questions

How to Cut Insulated Polystyrene Plasterboards?

We stock 2400mm by 1200mm Thermaline basic insulated boards. This standard size suits most insulation projects, however, in some situations, you might need to cut your insulated plasterboards down to size.

Cutting 2-in-1 plasterboard is easier than you might think. The plasterboard is the most rigid part of the product. You can cut through both the plasterboard and the insulation with a handheld saw, or even a very sharp knife. We encourage our customers to avoid Stanley knives, as they can become blunt very quickly.

Follow these steps for a clean, concise cut.

  1. Wear protective gear such as goggles and gloves.
  2. Use a ruler to mark the line that you want to cut
  3. Run a knife down the line to create a guide for your saw.
  4. Use your saw to cut through the line. Make sure that your saw cuts through the plasterboard.


How to Install Plasterboard Polystyrene Insulation?

We recommend using mechanical fixings and/or the dot and dab technique to install polystyrene insulated plasterboards. Lots of people use both fixings and adhesive for extra security, but you can achieve the same result with one or the other.

The dot and dab technique is an alternative to the traditional wet plaster method. The wet plaster method involves covering the entire internal wall with plaster. It takes hours to dry, which is an unnecessary expense for people who are paying labourers by the hour. The dot and dab technique uses less adhesive and saves more time.

Check out our handy dot and dab blog that explains the process and what's involved.

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