KORE External Insulation

EXTERNAL WALL INSULATION TECHNICAL DETAILS

Below is a sampling of the technical details available for KORE External wall insulation. KORE External is made from blocks of expanded polystyrene that have been aged from four to six weeks. This aging process ensures that every board of external insulation meets the required tolerances before it is delivered to site.

Our full technical library for KORE External is available on the KORE Resource Centre. Our technical library includes sample U-value calculations, condensation risk analysis, accredited construction details, declaration of performance certificates and a KORE External Wall Insulation Design Guide.

 

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KEY BENEFITS:

  • Meets and exceeds building regulations
  • Suitable for Passive House construction
  • Installed by insulation experts
  • Suitable for use with composite external insulation systems
  • Thermal mass benefits from concrete construction

 

External Insulation U-Value Calculations

Calculation Assumptions

All U-value calculations are in accordance with BS EN ISO 6946:2007. Unless stated otherwise inner blocks have a thermal conductivity of 1.13W/mK. Internal finishes unless otherwise stated taken as 12.5mm standard plasterboard with 3mm plaster skim on dabs. Conventional surface resistance; direction of heat flow taken as horizontal. Where applicable air layer is taken as unventilated. Unventilated air layer emissivity surfaces were given due consideration. Corrections for air layers and mechanical fasteners penetrating the insulation layer were considered. A correction factor was applied to calculations for existing buildings. These calculations should act as a guide only. Please contact our technical team for a detailed U-value calculation and condensation risk analysis. You can also download the KORE External Wall Insulation Design Guide or view all of our technical documents by visiting the KORE Resource Centre.

External Wall Detail: Cavity Wall Construction - Retrofit Block Inner and Outer Leaf, Plasterboard and Skim Internal Finish, Cavity Empty Unventilated, External Insulation Application

Existing Buildings

  Plasterboard, Block, Cavity, Block, Insulation, Render
Insulation KORE External EPS70 White KORE External EPS70 Silver
  U-Value W/m2K
100mm 0.30 0.26
120mm 0.26 0.23
150mm 0.22 0.19
175mm 0.20 0.17
200mm 0.17 0.15
250mm 0.14 0.12
300mm 0.12 0.11

 

External Wall Detail: Cavity Wall Construction - Block Inner and Outer Leaf, Dense Plaster Internal Finish, Cavity Pumped with KORE Fill Bonded Bead, External Insulation Application

New & Existing Buildings

  Plasterboard, Block, Cavity, Block, Insulation, Render
Insulation KORE External EPS70 White KORE External EPS70 Silver
  U-value W/m2K
100mm 0.30 0.26
120mm 0.26 0.23
150mm 0.22 0.19
175mm 0.20 0.17
200mm 0.17 0.15
250mm 0.14 0.12
300mm 0.12 0.11

Thermal Bridging

TGD Part L of the Irish Building Regulations states that care must be taken to ensure the continuity of insulation and to limit local thermal bridging, and that any thermal bridging should not pose a risk of surface or interstitial condensation. KORE have undertaken a complete thermal bridging analysis of KORE External Insulation at all typical junctions. Please contact our team today to request a copy of these results.

Building Standards

KORE External Insulation can satisfy the requirements of the Irish Building Regulations as outlined in:

  • Part L - Conservation of Fuel and Energy - Dwellings (2011)
  • Part L - Conservation of Fuel and Energy - Buildings other than Dwellings (2008)

Consideration must be given to the risk of condensation when designing thermal elements. In accordance with BS 2550:2002 Code of Practice for the control of condensation in buildings, a condensation risk analysis should be carried out. Contact the KORE technical department for further details.

PRODUCT AND TECHNICAL DETAILS

Density

KORE External EPS70 Silver: 15kg/m3
KORE External EPS70 White: 15kg/m3
KORE External EPS200 White: 30kg/m3

Thermal Conductivity

The thermal conductivity of KORE External insulation products are in accordance with IS EN 13163:2012 and EN 12667 Thermal Performance of building materials and products - determination of thermal resistance by mean of guarded hot plate and heat flow meter method.

KORE External EPS70 White: 0.037 W/mK
KORE External EPS70 Silver: 0.031 W/mK
KORE External EPS200 White: 0.032 W/mK

Thermal Resistance

Thermal resistance, known as the R-value, varies with the thickness of the insulation. To calculate the thermal resistance (m2.K/W) divide the thickness of the insulation by its thermal conductivity and round down the result to the nearest 0.05.

  KORE External EPS70 White KORE External EPS70 Silver KORE External EPS200 White
Thickness Insulation (mm) Thermal Resistance (m2.K/W)  
50mm 1.35 1.61 1.56
60mm 1.62 1.94 1.88
70mm 1.89 2.26 2.19
80mm 2.16 2.16 2.50
90mm 2.43 2.90 2.81
100mm 2.70 3.23 3.12
120mm 3.24 3.87 3.75
150mm 4.05 4.84 4.69
175mm 4.73 5.65 5.47
200mm 5.41 6.45 6.25
250mm 6.76 8.06 7.81
300mm 8.11 9.67 9.38

Declaration of Performance Certificates

The following DOP certificates are available for KORE External Expanded Polystyrene Insulation

KORE External EPS70 Silver
KORE External EPS70 White
KORE External EPS100 Silver
KORE External EPS100 White
KORE External Plinth EPS200 White

Project Specific Calculations

As part of our service, KORE offers individual calculations and technical assistance with individual projects. We can provide customised U-value calculations, condensation risk analysis, determination of exposure zone, accredited drawings and details, thermal bridging analysis results, temperature factor analysis and any other project specific requirements.

If you'd like to discuss the details of your project, please contact our technical team directly. If you would like a quotation, please click 'Request a Quote' below and upload your plans directly to our sales department. You can also join the KORE Resource Centre for access to our full technical database.

 

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Request a Quotation