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Underfloor Insulation

Over 20% of total building heat loss is through the floor. Choose from our range of underfloor insulation and start saving money on heating bills today!
Celotex GA4000 General Purpose PIR Insulation Board 1.2m x 2.4m - All Sizes

Celotex

from £8.43 Ex. Vat  
£10.12 Inc. Vat  

50mm Celotex GA4050 2.4m x 1.2m

Celotex

£14.21 Ex. Vat  
£17.05 Inc. Vat  

100mm Celotex GA4100 2.4m x 1.2m

Celotex

£24.95 Ex. Vat  
£29.94 Inc. Vat  

25mm Celotex TB4025 2.4m x 1.2m

Celotex

£9.20 Ex. Vat  
£11.04 Inc. Vat  

75mm Celotex GA4075 2.4m x 1.2m

Celotex

£20.95 Ex. Vat  
£25.14 Inc. Vat  

Celotex TB4000 Thermal Bridging Board 1.2m x 2.4m - All Sizes

Celotex

from £8.43 Ex. Vat  
£10.12 Inc. Vat  

EPS 70 2400mm x 1200mm (All Sizes)

Insulation4Less

from £4.33 Ex. Vat  
£5.20 Inc. Vat  

Quinntherm Insulation Board 1.2m x 2.4m (All Sizes)

Quinntherm

from £11.20 Ex. Vat  
£13.44 Inc. Vat  

120mm Celotex XR4120 2.4m x 1.2m

Celotex

£32.40 Ex. Vat  
£38.88 Inc. Vat  

12mm Celotex TB4012 2.4m x 1.2m

Celotex

£8.43 Ex. Vat  
£10.12 Inc. Vat  

150mm Celotex XR4150 2.4m X 1.2m

Celotex

£40.00 Ex. Vat  
£48.00 Inc. Vat  

70mm Celotex GA4070 2.4m x 1.2m

Celotex

£20.80 Ex. Vat  
£24.96 Inc. Vat  

40mm Celotex TB4040 2.4m x 1.2m

Celotex

£13.40 Ex. Vat  
£16.08 Inc. Vat  

Kingspan Thermafloor TF70 Floor Board 1.2m x 2.4m - All Sizes

Kingspan

from £12.62 Ex. Vat  
£15.14 Inc. Vat  

Celotex XR4000 Insulation Board 1.2m x 2.4m - All Sizes

Celotex

from £32.20 Ex. Vat  
£38.64 Inc. Vat  

90mm Celotex GA4090 2.4m x 1.2m

Celotex

£24.90 Ex. Vat  
£29.88 Inc. Vat  

60mm Celotex GA4060 2.4m x 1.2m

Celotex

£17.90 Ex. Vat  
£21.48 Inc. Vat  

30mm Celotex TB4030 2.4m x 1.2m

Celotex

£11.40 Ex. Vat  
£13.68 Inc. Vat  

20mm Celotex TB4020 2.4m x 1.2m

Celotex

£9.68 Ex. Vat  
£11.62 Inc. Vat  

80mm Celotex GA4080 2.4m x 1.2m

Celotex

£23.90 Ex. Vat  
£28.68 Inc. Vat  

140mm Celotex XR4140 2.4m x 1.2m

Celotex

£38.90 Ex. Vat  
£46.68 Inc. Vat  

Greenguard (Styrozone) GG300 (1.25m x 0.6m) All Sizes

Kingspan

from £0.00 Ex. Vat  
£0.00 Inc. Vat  

110mm Celotex XR4110 2.4m x 1.2m

Celotex

£32.20 Ex. Vat  
£38.64 Inc. Vat  

130mm Celotex XR4130 2.4m x 1.2m

Celotex

£36.75 Ex. Vat  
£44.10 Inc. Vat  

Fibran 300L 1250mm x 600mm (All Sizes)

Fibran

from £6.00 Ex. Vat  
£7.20 Inc. Vat  

Kingspan Kooltherm K103 Floorboard 1.2m x 2.4m - All Sizes

Kingspan

from £27.79 Ex. Vat  
£33.35 Inc. Vat  

Eco-versal (2.4m x 1.2m) - All Sizes

Ecotherm

from £11.20 Ex. Vat  
£13.44 Inc. Vat  

MuteStrip Self-Adhesive Vibration Dampening Strip 50mm x 6m

iKoustic

£10.00 Ex. Vat  
£12.00 Inc. Vat  

165mm Celotex XR4165 2.4m x 1.2m

Celotex

£51.40 Ex. Vat  
£61.68 Inc. Vat  

Danodren Garden with Integral Geotextile Fleece - 20m x 2.1m

Danosa

£89.99 Ex. Vat  
£107.99 Inc. Vat  

MuteMat 2 1200mm x 600mm x 10mm

iKoustic

£15.26 Ex. Vat  
£18.31 Inc. Vat  

Isolation Strip Self-Adhesive 46mm x 2m x 4-8mm

iKoustic

£4.00 Ex. Vat  
£4.80 Inc. Vat  

Ballytherm 2.4m x 1.2m - All Sizes

Ballytherm

from

Thin-R 2.4m x 1.2m (All Sizes)

Xtratherm

from

Safe-R 2.4m x 1.2m (All Sizes)

Xtratherm

from

Danodren R-20 Horizontal Waterproofing Sheet - 20m x 2m

Danosa

£194.02 Ex. Vat  
£232.82 Inc. Vat  

MuteMat OSF 750-10 Screed Underlay 1.3m x 5m x 10mm ( 6.52m2)

iKoustic

£112.19 Ex. Vat  
£134.63 Inc. Vat  

MuteMat OSF 750-05 Screed Underlay 1.3m x 20m x 3mm ( 26m2)

iKoustic

£113.26 Ex. Vat  
£135.91 Inc. Vat  

MuteMat OSF 750-03 Screed Underlay 1.3m x 20m x 3mm ( 26m2)

iKoustic

£132.03 Ex. Vat  
£158.44 Inc. Vat  

MuteMat USF 650-03 Screed Underlay 1.3m x 20m x 3mm (26m2)

iKoustic

£117.52 Ex. Vat  
£141.02 Inc. Vat  

MuteMat USP 750-08 Screed Underlay - 10m x 1300mm x 8mm

iKoustic

£135.59 Ex. Vat  
£162.71 Inc. Vat  

200mm Celotex XR4200 2.4m x 1.2m

Celotex

£61.95 Ex. Vat  
£74.34 Inc. Vat  

Underfloor insulation - Temperature Control

Nowadays, homeowners are only starting to understand and appreciate the importance of home insulation. Insulation is one of the best ways to make your house comfortable and to control the indoor temperature. Whether you have chosen a cold or hot insulation system, the immediate results are hugely beneficial. From the tip of your roof right down to the underneath of your floor, you can insulate all the parts of your house. So now let’s discuss some of the benefits of Underfloor Insulation.

Prevents Heat Loss and Access of Cool Air

Up to 15% of heat has a chance of escaping through your floor. In this case, underfloor insulation boards help you to solve the issue. This insulation is effective in retaining heat during the winter months. Some buildings have a crawl space which is even more of a reason to install underfloor insulation. Cool air can pass through the crawl space meaning your room could be filled with unwanted cold air.

Why use a Vapour Barrier?

Moisture problems are very common in wooden floors. If wet, they become stained or warped. For these types of floors underfloor insulation is the right choice. It protects the floors against condensation build up.

Insulation - not only ideal for the Winter

Most of us think that the insulation products are useful for the winter season only. However, during hot summer days underfloor insulation can prove most beneficial to you. If your house has a basement, the rising heat can start accessing your living space. Installing underfloor insulation can prevent the access of this unwanted heat.

Foil Sheets

Foil sheet insulation is very common for insulating underfloor spaces. It is well known for its advanced abilities of trapping air and vapour.

The cheapest solution for you

When trying to more accurately control the heat of a room people often turn to the use of AC systems. These simply add to your monthly heating expenses. Installing Underfloor insulation provides more control over the temperature of a room and helps lowers annual heating bills drastically.

R-value - the higher the better right? no.

The R-value of insulation indicates its level of effectiveness. A Higher R-Value means the more powerful the insulation is. For underfloor insulation, the minimum R-value has to be R1.4. Your property condition, climate and the building type are all major factors that come into consideration when identifying the right R-value for your insulation product. You may think that it is best to have insulation with highest R-value. However, it is not always essential. It is best to get an expert opinion before commencing with the installation.

Insulation batts for underfloor insulation

This product has become a very popular choice in underfloor insulation. The insulation batts remain pressed together between joists. Best practice is to then slung the straps across these joists for the best backup and support.
You can invest in high quality and high-performance polyester insulation products which prevents any sagging issues that may arise down the line.


What Best Suits your Floor Type?

There are a huge range of different Insulation types and it is important that you pick the right one for your floor type.

Suspended Floor / Suspended Timber Floor - If you have a suspended floor, made of timber, a suitable choice of underfloor insulation would be polyester sheets or glasswool. Fit the sheets between your floor joists and you strap them securely. For optimum results you may use lining material.

In most older buildings, you can find suspended timber flooring systems. You can insulate these timber floors by raising the floorboards and laying the mineral wool beneath.



Concrete Floors - In some houses, concrete floors are present. The most popular concrete underfloor insulation choice is polystyrene board.

Underfloor Insulation - Things to Know

Placing a continuous insulation layer (polystyrene board) over a damp-proof covering will result in an increase of R-value by R0.2.
The slab edges are the major source of loss of heat. Thus, insulation of slab edge is much more important than that of the slab underside.
It is possible that your house may have waffle or conventional slab base. Polystyrene insulation is best choice for insulating it. However, the use of uPVC sheet at the outer part of this insulation panel is highly essential.

Here at Insulation4Less we aim to provide you with the highest quality insulation at the lowest prices. We hope this guide has helped you make a more informed decision on your insulation purchase.

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