KORE Floor Insulation

Expanded Polystyrene Floor Insulation

KORE Floor is a high performance floor insulation solution for use below a concrete floor slab, below a cement based screed on a concrete slab with a hardcore base, above a suspended concrete floor and between the joists of a suspended timber floor.

KORE’s EPS floor insulation is made from rigid polystyrene boards cut from moulded blocks of Expanded Polystyrene. The closed cell nature of the boards ensure a consistent thermal and compressive performance throughout the lifetime of the building.

KORE Floor Insulation is available in two grades of material, KORE White or Silver.

Thermometer showing temperature

SUPERIOR THERMAL PROPERTIES

Installing KORE Floor Insulation will contribute significantly to a building’s energy efficiency. KORE Floor is available in two grades of material, White & Silver. KORE Silver can provide higher insulation values compared to the standard white material. You can view our floor insulation technical details to compare U-values between the two.

Arrows showing high compressive insulation strength

EXCELLENT COMPRESSIVE STRENGTH

KORE Floor is available in a number of compressive strengths and is suitable for applications under very heavy loads. When combined with our insulated foundation system KORE Floor Insulation can achieve U-values not found in any other product on the market. Speak with our technical team to learn more about our floor insulation solutions.

Underfloor heating system radiating heat

UNDERFLOOR HEATING APPROVED

KORE Floor Silver is the ideal solution for insulation with underfloor heating. The graphite flakes that give the product its distinguishable colour is responsible for reflecting the heat radiation from the heat source back into the building. KORE Floor Insulation easily achieves Ireland’s Building Regulations of 0.15W/m2K (Part L 2019) when used in combination with an underfloor heating system

Green checkmark with circle

FULLY CERTIFIED FLOOR INSULATION

The KORE Floor Insulation System is fully certified by the Irish Agrement Board for use in applications listed within the certificate. View our KORE Floor IAB Certification. KORE Floor is certified by NSAI Agrement Certificate Number 04/0097 and manufactured to to BS EN 13163:2012 and EN ISO 9001:2015 Quality Management System.

WHY CHOOSE KORE FLOOR INSULATION?


Up to 10 percent of a building’s heat loss can occur through an uninsulated, poorly insulated or draughty floor. This heat loss can easily be remedied with the use of floor insulation in both new builds and in retrofit applications when practical. KORE Floor is available in two different grades of EPS – White & Silver. 75mm KORE Floor Silver insulation provides an identical U-value as 100mm KORE Floor White, meaning less material may be used for the same end result. In addition, KORE Floor insulation is available in a number of compressive strengths and is suitable for use under heavy loads.

Like all KORE EPS products, our floor insulation does not absorb water or moisture. The system is easily installed in damp conditions without the need to worry about mould growth, water absorption or rot. Expanded Polystyrene floor insulation will last the lifetime of the building, making it a sustainable product that can easily be recycled at the end of its useful life.

KORE Floor easily meets Ireland’s Building Regulations, both Part L 2011 and Part L 2019 (nZEB). Technical information, including U-value calculations, thermal resistance and product performance certificates is readily available. You can download the latest technical documents from the KORE Resource Centre.

MEET nZEB with KORE Floor Insulation

KORE’s EPS floor insulation has been designed to meet and exceed the U-value requirements of Part L 2019 (nZEB-Ready), and continues to meet the requirements of Part L 2011.

From 1st November 2019, the proposed U-value requirement for floor insulation in new builds is 0.18W/m2K. For floors with underfloor heating the required U-value is 0.15W/m2K.

Current building regulations require 0.21W/m2K, and 0.15W/m2K in buildings with underfloor heating. The following table shows the grade of EPS and its thickness required to meet the minimum U-value requirements.

Material Thickness U-Value
EPS70 Silver 150mm 0.15W/m2K
EPS100 White 300mm 0.10W/m2K

Assuming a P/A ratio of 0.4

For more information contact our technical team.

Request a quote

Submit your plans and receive a free, no obligation quotation for KORE Floor Insulation specific to your project requirements.

Request a quote

KORE Floor Technical Specifications

Floor Insulation Made From Expanded Polystyrene

KORE Expanded Polystyrene is a viable alternative to other insulation materials, such as PIR insulation. The tables below compare EPS to PIR and the thickness required to achieve the same U-values, in addition to sample U-value tables for KORE Floor EPS70 Silver and KORE Floor EPS70 White.

The U-value of a floor is calculated by dividing the floor exposed perimeter (P) by the floor area (A). TGD Part L of Ireland’s Building Regulations require that U-values of exposed floors not exceed 0.21W/m2K or 0.15W/m2K when used in conjunction with an underfloor heating system. This will drop further to 0.18W/m2K when TGD Part L 2019 comes into effect beginning on 1st November 2019. The sample U-values below take into account solid concrete ground floors with insulation (EPS) below the floor slab.

KORE EPS Floor Insulation vs. PIR Insulation

           With & Without Screed

Material Thermal Conductivity Thickness U-Value
PIR Insulation 0.022W/mK 100mm 0.16W/m2K
KORE Floor EPS70 Silver 0.031W/mK 150mm 0.15W/m2K
PIR Insulation 0.022W/mK 150mm 0.12W/m2K
KORE Floor EPS70 Silver 0.031W/mK 200mm 0.12W/m2K

Calculation assumes a P/A of 0.4

Solid Concrete Ground Floors – Insulation Below the Floor Slab – (150mm Concrete Slab, 2% Steel) Sample U-Values

Insulation Thickness Perimeter/Area (m2)
0.2 0.3 0.4 0.5 0.6 0.7
U-Value W/m2K
100mm 0.17 0.19 0.21 X X X
125mm 0.15 0.17 0.18 0.19 0.19 0.20
150mm 0.13 0.15 0.16 0.16 0.17 0.17
175mm 0.12 0.13 0.14 0.14 0.15 0.15
200mm 0.11 0.12 0.12 0.13 0.13 0.13
210mm 0.11 0.11 0.12 0.12 0.13 0.13
220mm 0.10 0.11 0.12 0.12 0.12 0.12
230mm 0.10 0.11 0.11 0.11 0.12 0.12
240mm 0.10 0.10 0.11 0.11 0.11 0.11
250mm 0.09 0.10 0.10 0.11 0.11 0.11
260mm 0.09 0.10 0.10 0.10 0.10 0.11
270mm 0.09 0.09 0.10 0.10 0.10 0.10
280mm 0.09 0.09 0.09 0.10 0.10 0.10
290mm 0.08 0.09 0.09 0.09 0.09 0.10
300mm 0.08 0.09 0.09 0.09 0.09 0.09

Solid Concrete Ground Floors – Insulation Below the Floor Slab – Sample U-Values

Insulation Thickness Perimeter/Area (m2)
0.2 0.3 0.4 0.5 0.6 0.7
U-Value W/m2K
100m 0.19 X X X X X
125mm 0.17 0.19 0.20 0.21 X X
150mm 0.15 0.17 0.18 0.19 0.19 0.20
175mm 0.13 0.15 0.16 0.16 0.17 0.17
200mm 0.12 0.14 0.14 0.15 0.15 0.15
210mm 0.12 0.13 0.14 0.14 0.15 0.15
220mm 0.12 0.13 0.13 0.14 0.14 0.14
230mm 0.11 0.12 0.13 0.13 0.14 0.14
240mm 0.11 0.12 0.12 0.13 0.13 0.13
250mm 0.11 0.11 0.12 0.12 0.13 0.13
260mm 0.10 0.11 0.12 0.12 0.12 0.12
270mm 0.10 0.11 0.11 0.12 0.12 0.12
280mm 0.10 0.11 0.11 0.11 0.11 0.12
290mm 0.09 0.10 0.11 0.11 0.11 0.11
300mm 0.09 0.10 0.10 0.11 0.11 0.11
Thermal Resistance of KORE Floor Insulation

KORE Floor EPS70 White KORE Floor EPS70 Silver KORE Floor EPS100 White KORE Floor EPS100 Silver KORE Floor EPS200 White
Thickness Insulation (mm) Thermal Resistance (m2.K/W)
50mm 1.351 1.613 1.389 1.613 1.515
75mm 2.027 2.419 2.083 2.419 2.273
100mm 2.703 3.226 2.778 3.226 3.030
125mm 3.378 4.032 3.472 4.032 3.788
150mm 4.054 4.839 4.167 4.839 4.545
175mm 4.730 5.645 4.861 5.645 5.303
200mm 5.405 6.452 5.556 6.452 6.061
250mm 6.757 8.065 6.944 8.065 7.576
300mm 8.108 9.677 8.333 9.677 9.091

KORE Floor Installation Guidelines

The following guidelines are for reference only and may not include all relevant details or applications. For more information please contact the KORE technical team or download our NSAI certification document.

Insulation Below the Floor Slab

1. Where KORE Floor Insulation System is used below the floor slab, lay the hardcore in layers (150-225mm). Each layer should be well compacted with the surface blinded with quarry dust or sand to provide a suitable surface for laying a DPM (damp proof membrane).

2. A DPM e.g. 1200 gauge polythene or a radon barrier, subject to site conditions, should be laid over the blinding with joints taped to prevent the passage of ground moisture. The DPM should be carried up the wall until it meets and seals with the damp proof course.

3. KORE Floor Insulation System should be laid with closely butted joints, laid staggered with a break-bonded pattern and fitted tightly at the edges and around any service penetrations.

4. Vertical up stands of insulation 50mm thick should be placed at the floor perimeter to minimise thermal bridging.The KORE Passive Foundation System offers the ideal solution for constructing a thermal bridge free foundation.

5. Care should be taken to avoid damage to the insulation or DPM and radon barriers as the slab is being poured and operatives should make use of barrow runs and walkways whilst installation progresses.
Airtightness details between the floor and the wall structure must be considered and best practice adopted.

Insulation Below the Screed

1. Where KORE Floor Insulation is used below the floor screed, the floor slab with which the insulation is to be laid must be level.

2. A DPM e.g. 1200 gauge polythene or a radon barrier, subject to site conditions, should be laid over the blinding with joists taped to prevent the passage of ground moisture. The DPM should be carried up the wall until it meets and seals with the damp proof course.

3. KORE Floor Insulation System should be laid with closely butted joints, laid staggered with a break-bonded pattern and fitted tightly at the edges and around any service penetrations.

4. Vertical up stands of insulation 50mm thick should be placed at floor perimeter to minimise thermal bridging. The KORE Passive Slab Foundation System offers the ideal solution for constructing a thermal bridge free foundation.

5. Care should be taken to avoid damage to the insulation or DPM and radon barriers as the slab is being poured and operatives should make use of barrow runs and walkways whilst installation progresses.

6. The concrete floor over which the insulation is to be laid should be left as long as possible to maximise drying out in accordance with the relevant recommendations of BS 8203:2001 Code of Practice for the installation of resilient floor coverings.

7. The minimum thickness of sand and cement screed is 65mm for domestic construction and 75mm for most other buildings. However, architectural specifications should be consulted. Different floor screeds have different installation requirements.

8. Airtightness details between the floor and the wall structure must be considered and best practice adopted.

Block & Beam Floors

1. The floor surface should be smooth and flat – any irregularities should be removed. Lay a DPM to ensure that it is correctly positioned and turned up to meet the seal with the DPC.

2. KORE Floor Insulation System should be laid with joints tightly butted and staggered joints. During construction the boards must be protected from damage by moisture sources, water spillage, plaster droppings, etc. Use scaffold boards to prevent wheelbarrow and other traffic damage to the boards. KORE Floor Insulation System should be over laid with 500 gauge polythene sheet to prevent the wet screed from penetrating the joints between the insulation boards.

3. As is the case with solid ground floors, attention should be given to detailing to avoid thermal bridging.

4. All surfaces should be level to accept the KORE Floor Insulation System. Uneven surfaces should be levelled prior to laying of the floor.

5. Airtightness details between the floor and the wall structure must be considered and best practice adopted.

Suspended Timber Floors

1. KORE Floor Insulation System should be cut to fit between the timber joists and supported by carriers. These may be nails part driven into the sides of the joists at selected level, timber battens or proprietary saddle clips.

2. Where services need to be accommodated below the floor, KORE Floor Insulation System can be lowered to provide an insulated duct.

3. Install flooring grade chipboard, ply or softwood timber flooring directly onto the joists fixing in the normal manner.

4. Ensure that the void below the insulated suspended floor is well ventilated and that the sleeper walls do not restrict the airflow.

5. Airtightness details between the floor and the wall structure must be considered and best practice adopted.

KORE Floor Downloads

The following is a sample of technical documents available for KORE Floor Insulation. For the complete technical library please join the KORE Resource Centre.

  • Download the KORE Floor Insulation Design Guide Part L – 2011Download
  • Download the KORE Floor Insulation Design Guide Part L – 2019 (nZEB-Ready)Download
  • Download the KORE Floor Insulation BrochureDownload
  • Download the KORE Floor Insulation NSAI CertificateDownload
  • Download the KORE Floor Insulation BIM Object FilesDownload

Request a quote or get in touch today

Request a free, no obligation quotation today by clicking on the Request a Quote button below. Remember to include your floor plans in PDF or AutoCAD format so we can provide an accurate price. For general questions, get in touch with us!

published:10 Sep 2018
,