If you are looking to purchase insulated plasterboards, then look no further. We offer the highest quality plasterboards at the most competitive prices. Plasterboard is also called drywall by many and consists of Gyproc or Gypsum packed in-between heavy-duty construction paper. It is used to make the internal and external walls of homes and commercial properties. Insulated plasterboards are designed to help keep the heat in. Our insulated plasterboard products are manufactured from premium quality materials and perform exceptionally well. We stock brands such as Kingspan and Celotex.

Insulated Plasterboard is used for loft conversions, insulated external walls, and internal partitioning at home. It is available in a range of materials, sizes, and thicknesses to ensure the right product is available to suit your insulation needs.

Insulated Plasterboard is a popular product used to improve insulation in your home or commercial building creating a barrier in between the external environment and the living/working space. This forms a product designed to keep the heat in and save money on your energy bill. This also provides great thermal performance that creates a comfortable living or working space.

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Celotex 37.5mm Insulated Plasterboard (2400mm X 1200mm X 37.5mm) – PL4025

£39.32 ex VAT

Kingspan Kooltherm K118 37.5mm Insulated Plasterboard

£1,458.05 ex VAT

12.5mm Gyproc Moisture Resistant Plasterboard (2400 x 1200mm) – Square Edge

£13.79 ex VAT

Celotex 52.5mm Insulated Plasterboard (1200x2400mm) – PL4040

£44.72 ex VAT

Speedline 37.5mm Insulated Plasterboard (1200 x 2400mm)

£52.49 ex VAT

Speedline 52.5mm Insulated Plasterboard (1200 x 2400mm)

£53.51 ex VAT

Speedline 62.5mm Insulated Plasterboard (1200 x 2400mm)

£62.38 ex VAT

12.5mm Gyproc FireLine Plasterboard (2400 x 1200mm) – Square Edge

£11.51 ex VAT

15mm Gyproc FireLine Plasterboard (2400 x 1200mm) – Square Edge

£13.83 ex VAT

15mm Gyproc Moisture Resistant Plasterboard (2400 x 1200mm) – Square Edge

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Celotex 62.5mm Insulated Plasterboard (1200x2400mm) – PL4050

£50.29 ex VAT

Celotex 72.5mm Insulated Plasterboard (1200x2400mm) – PL4060

£52.59 ex VAT

Kingspan Kooltherm K118 42.5mm Insulated Plasterboard

£1,288.65 ex VAT

Kingspan Kooltherm K118 52.5mm Insulated Plasterboard

£1,137.40 ex VAT

12.5mm Gyproc FireLine Plasterboard (1800 x 900mm) – Tapered Edge

£7.51 ex VAT

12.5mm Gyproc FireLine Plasterboard (3000 x 1200mm) – Square Edge

£14.48 ex VAT

A guide to insulated plasterboard

Insulated plasterboard is a material used widely in the home and building industry. It is used as thermal insulation to reduce electricity bills, making the living space more comfortable.

Insulated plasterboard has gained popularity in recent years due to its comparative affordability when compared with other insulation materials. This guide will help you identify insulated plasterboard brands and give you the know-how on how to install insulated plasterboards.

Our insulated plasterboard range consists of brands such as Kingspan Kooltherm and also Celotex. The two popular styles are the Celotex PL4000 and the Kingspan Kooltherm K118 insulated plasterboards. Both of these insulated boards come in a variety of thicknesses. They have many applications such as in solid masonry walls and in timber frame builds as well as rafters and joists. Celotex insulated plasterboard can reduce your energy consumption by up to 50% by reducing heat loss and keeping your house warmer in the winter. During the summer Celotex insulated plasterboard will keep your house cooler.

Different types of Insulated Plasterboard

Standard Insulated Plasterboard

Basic Insulated Plasterboard is typically made up of 9.5mm gypsum board which is backed with a sheet of expanded polystyrene. The thickness of the Insulation sheet usually varies between 12mm and 30mm. The thickness depends on the insulation level needed. This product can be used to line the walls of internal rooms.

Vapour-Control Insulated Plasterboard

Vapour- Control Insulated Plasterboard is typically made using a slightly thicker gypsum board (around 13mm), which is backed with high-performance polyisocyanurate foam. One or two layers of vapour control material are also attached to this product. This product can be useful for lining attic rooms and window reveals.

Moisture Resistant Insulated Plasterboard

Moisture Resistant Insulated Plasterboard is typically a higher performance insulated plasterboard which is typically made using a gypsum board (12-13mm) which is backed with rigid polyisocyanurate foam as well as two vapour barriers. This product is designed for use in partitions and wall lining where thermal performance and high moisture resistance are needed.

High-performance Insulated Plasterboard

High-performance insulated plasterboard is typically formed of a sheet of gypsum board (9-13mm) which is backed with high-density phenolic foam. It usually includes at least one vapour-control layer. This product is designed to be used in new builds and refurbishment for walls and ceilings where a higher level of thermal insulation is needed.

How to cut insulated plasterboard?

Insulated plasterboard is easy to cut or trim for irregular shapes. If you are planning to use insulated plasterboard, it is important that you know how to cut or trim the sheets correctly.

If you get this part wrong, you can render your insulation ineffective and even cause damage to the building structure. Insulated plasterboard usually comes in large sheets and may need to be cut down into smaller sections. Cutting plasterboard can be challenging and often a messy process. The best method is to measure the size you need using a tape measure. Then grab a ruler and pencil and draw a straight line along. It is a good idea to find a spirit level and ensure the pencil markings are straight. Many people use a Stanley knife to cut plasterboard. This is ok for the initial markings or cut, however, we recommend using a saw once you have made the indent. This will help you get a clean cut.

Therefore, read on for helpful tips on cutting insulated plasterboard.


  • Use a sharp and clean blade
  • Use the right tools to cut or trim your sheets
  • Work slowly and methodically, as it will help you achieve better results.

Mark out the area to be trimmed with dots. Make sure that these are evenly spaced apart. Then use a straight edge to connect them in straight lines. You can also use a spirit level to create a clean straight line.

Measure the sheets you want to cut with a tape measure. If you have a calculator, use it to calculate the area and mark out the area with dots as above. Use these marks as guides when cutting your insulated plasterboard.

Set up your saw or blade at an angle of about 45 degrees. This is important since it will allow you to work more efficiently. Cut along the line drawn by dots.

Make sure that your blade is sharp and clean before beginning the cut. Shake off any dust or particles from the sheet as well. If you are using insulated plasterboard that has been left exposed to sunlight, cover them with a cloth before cutting.

Set up your blade to fit the width of the cut. Start with a shallow angle and then adjust it as needed. Do not forget to wear safety goggles while you work, especially if you are going through many sheets of this material on a regular basis.

Cut along the line you have drawn as precisely as possible. In most cases, a simple 45-degree angle is enough. Avoid tilting the blade, since it can affect the accuracy of the cut.

Check your work before peeling off any protective layers or removing any sheets from their packaging/shipping cartons.

Remove all protective layers of the sheet before installing it. When you are sure you have done everything accurately, you can switch sides and start working on another line if necessary.

Normal blades will not get you the precision required for accurate cuts. Instead, edge your saw using a special 45-degree blade. You can also use circular blades with a knife or jigsaw, but these can offer less control than the former options.

If you are not looking for precision cuts, you can always score your insulated plasterboard and then rip it along the line to cut it down into smaller pieces. A multi-purpose tool can help you accomplish this task more easily.

Why do we use insulated plasterboards?

Simply put, insulated plasterboards are used for loft conversions, insulated external walls, and internal partitioning at home. The purpose of insulated plasterboard is to provide insulation against the cold and heat in your house by filling the space between wall studs or rafters respectively.

This means insulated plasterboards are fundamentally used as a barrier between the external environment and living space in a building.

They are used in buildings, especially those with roofs that contain mainly timber frames as insulated plasterboards are installed between the rafters of a roof to provide sound insulation and temperature control for an attic or a loft conversion.

Overall insulated plasterboards are used to reduce heat loss/gain from timber-framed roofs. This is done by filling the cavity in between attic rafters with insulated plasterboard.

In insulated external walls, insulated plasterboards are used to block the thermal bridging between timber frames in a wall and the internal rooms of your house. Insulated plasterboards provide excellent insulation for both loft conversions and insulated external walls, however, they must be installed correctly.

Internal partitioning can be done by using insulated plasterboards between studs or rafters in the space you want to divide. By doing this insulated plasterboards provide insulation against noise and temperature gain/loss between rooms of a house.

Insulated Plasterboard is extremely important when building a house as it provides the reassurance that it will be insulated and help to keep the heat in. It is most commonly used on internal walls to help aid the thermal performance of the home, however, due to the structure, it ensures that the wall isn’t made too thick. It is also a great time and money saver, alongside being easy to install. In the long run, insulated plasterboard will certainly save you money on heating the home. Furthermore, it can often work out cheaper to insulate your walls with insulated plasterboard than buying both aspects separately.

When to use Insulated Plasterboard?

As mentioned above it is usually used to line internal walls. These walls are usually brick. Insulated plasterboard is most helpful when both a type of insulation and drylining is needed. You can therefore get both jobs and requirements met in one.

How much does insulated plasterboard cost?

The price of the insulated plasterboard is dependent on the specifications of your project. At Trade Insulations, we are known to have the best prices on insulated plasterboard. Our Celotex PL4000 insulated plasterboards can be bought in single sheets. Our K118 plasterboards are sold in packs only. Bulk buying is a cost-effective way of saving money. Why pay more for insulation when you can get it for less at Trade Insulations. We save our customers £1000s per year. We offer expert advice, speedy delivery, and only the best customer service. You can browse insulated plasterboards, as well as many other insulation products. Remember, you don't have to be in the trade to get trade prices on your insulation when you choose us. We offer trade prices for everyone. Top brands, trade prices is the motto.

How to install Insulated Plasterboard

There are a couple of different ways to install insulated plasterboard. The most popular method and the one we would recommend is direct bond installation. This method is fast and long-lasting; however, it requires conduits and piping to be installed before the installation of the plasterboard.
Before beginning the installation, the walls must be prepared so that they are clean, free from any excess materials, and dry. If you are looking to install insulated plasterboards using the direct bond method, then follow the steps below.
Using a pencil carefully measure and mark the spots where you will be placing the plasterboards. Mark out the entire room before beginning to place any plasterboards so you can see how many will be required and measure the space first. It is always a good idea to start installing the plasterboards from either the door or a window and work from there. Using adhesive makes a continued bed around the entire edge of the space where you will be fitting the plasterboards. Next cut the boards. This is most effectively done using the guidance above. Apply a small amount of adhesive to the wall. You should place approximately 750mm x 250mm of adhesive on the wall or aim for it to cover around 20% of the board. Lightly tap the boards into the position you want them in. Using a spirit level measure to ensure they are straight and fitted correctly. Hold the boards in place and make sure you continue to support them and their weight until the adhesive has been set. Once the adhesive has been set, take your fixings and place them around the board, approximately 25mm from the edge. Then continue to follow the steps above so that you get all plasterboards fitted. Another method for installing plasterboards is the dot and dab method. This is not the method we usually recommend for installing insulated plasterboards; however, it can still help you to get the job done. If you are looking to purchase insulated plasterboard but still have a few questions after reading this, then don’t hesitate to get in touch. Our friendly customer service team is on hand to answer all your questions to help you make the right choices when purchasing plasterboards.

Celotex Insulated Plasterboard

Celotex insulated plasterboards are in high demand on our website. We stock good levels of PL4000 insulated plasterboard. Our PL4000 Celotex Insulated Plasterboards can be bought in single quantities. For garage or room insulation, the Celotex PL4000 is a great choice — its affordability makes it ideal and offers high thermal values. The Celotex PL400 thermal laminate board can be fitted using standard brick and tile fixings and drywall adhesive known as Dot n Dab. The Celotex PL4000 comes in a variety of thicknesses from 25mm to 60mm.

Kingspan Insulated Plasterboard

Kingspan Kooltherm K118 is a premium insulated plasterboard from Kingspan. Kingspan Kooltherm K118 Insulated plasterboard is a premium, lower lambda internal wall insulation with fiber-free rigid phenolic core. It has a 12.5mm finish on its front and a composite foil based surface on the back. The insulation is suitable for both mechanically fixed or plaster dab/adhesively bonded dry-lining installation.

Does thermal plasterboard work?

Thermal Plasterboard, which is also known as insulated plasterboard is a great choice of insulation. People often ask does thermal plasterboard work? and the answer is simply yes. Thermal plasterboard is great because it doubles up as an insulation board and plasterboard. This means it has the benefits of both of these product types. Another major advantage of insulated plasterboard is that the installation time is cut down in half. This is because instead of installing an insulation board and then plasterboard, you can just make the one install. Doing this is also a cost-effective solution.

Cheap Insulated Plasterboards

Insulated plasterboard can be purchased directly on our website. We stock high quality cheap insulated plasterboards, by top brands such as Celotex and Kingspan. We take pride in our speedy delivery as well as expert knowledge. We stock top brands at trade prices and can help guide you if you are unsure of anything. If you want the best prices on insulated plasterboard, then choose Trade Insulations. The best part is, that you don't even have to be in the trade to get trade prices.