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Polystyrene Backed Plasterboard (4 Products)

Scouting for a cost-effective drylining solution? EPS insulated plasterboard is the way to go. EPS insulated plasterboard, often called "Thermaline basic" or "Jablite", comprises a sheet of expanded polystyrene insulation (EPS) bonded to a 9.5mm plasterboard and is a no-fuss way to dryline the internal side of a blockwork wall. It makes up for its 'basic' thermal performance (or lack thereof) of 0.038 W/mK in its convenience: being super easy to handle and install.

Find Out More About Our Types of Polystyrene Insulated Plasterboard
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Polystyrene Backed Plasterboard

What Is Polystyrene Backed Plasterboard?

You might have heard polystyrene plasterboard referred to as Thermaline basic or Jablite plasterboard (after the popular manufacturer of EPS insulation). In terms of its thermal performance, it is as “basic” as named, due to its basic level thermal performance of 0.038 W/mK.These 2400mm by 1200mm boards offer an all-in-one solution to people who want to save time and money. Each board is comprised of a sheet of thermal insulation that is bonded to a 9.5mm tapered edge plasterboard; with the plasterboard only covering one side of the insulation.

  • Designed for installation on the internal side of blockwork walls
  • 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 expanded polystyrene insulant with zero ODP (ozone depletion potential)
  • Provides an ideal surface for plaster skimming or jointing


Polystyrene Backed Plasterboard Thickness

We stock Thermaline basic insulated plasterboard in thicknesses ranging from 22mm, 30mm, and 40mm. You can either install EPS 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

Benefits of EPS 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 – Each EPS insulated plasterboard in our range has a tapered edge. The tapered finish allows installers to achieve a seamless finish between sheets. 
  • Cost Efficiency – EPS is often not the first choice for people who want to reduce heat loss and improve the thermal envelope of their homes, but it is far cheaper than more effective alternatives such as PIR insulation. EPS plasterboards are also very easy to handle and install in internal walls. 


Where Can I Install Polystyrene Plasterboards? 

Polystyrene-backed plasterboards are designed for installation on the internal side of blockwork walls. They contain in-built tapered edge plasterboard on one side. Each board is built in accordance with industry standards. 

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 EPS 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 article here.