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KORE KEY PARTIAL FILL CAVITY WALL INSULATION TECHNICAL DETAILS

The KORE Key System combines partial fill cavity wall insulation and internal insulation to quickly achieve high comfort levels for occupants, while eliminating the devastating effects of thermal looping.

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KEY FEATURES & BENEFITS

  • Meets and exceeds Building Regulations
  • Sheets are tongue and grooved
  • Prevents thermal looping
  • Easy to work with and install
  • Controls surface and interstitial condensation in walls
  • Suitable for use with composite external insulation systems
  • Thermal mass benefits from concrete construction

TYPICAL CONSTRUCTION AND U-VALUE CALCULATIONS

All U-value calculations are in accordance with BS EN ISO 6946:2007. Unless otherwise stated, inner blocks have a thermal conductivity of 1.13W/mK. Internal finish, 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. Calculations that include KORE Thermal Board; the vapour control layer is provided by the plasterboard (Gyproc Duplex Board 12.5mm). KORE Thermal Board applied using plaster dabs are treated as an inhomogeneous layer. Corrections for air layers and mechanical fasteners penetrating the insulation layer were considered. Best practice in terms of workmanship was assumed and therefore the correction factor for air gaps were ignored in calculations for new buildings. A correction factor was applied to calculations for existing buildings. Mechanical fasteners were taken as double triangle stainless steel, number 2.5 per m/sq. These calculations should act as a guide only. Please contact our technical team for a detailed U-value calculation and condensation risk analysis.

Detail 1: Cavity Wall Construction - Block Inner and Outer Leaf, Thermal Plasterboard and Skim Internal Finish

  Plasterboard, Insulation, Block, Insulation, Cavity, Block, Render

KORE Key EPS70 Silver (mm) KORE Thermal Board EPS70 Silver KORE Thermal Board EPS70 Silver KORE Thermal Board EPS70 Silver
  25mm 38mm 50mm
  U-Value W/m²K

110 0.20 0.18 0.17
150 0.16 0.15 0.14

Detail 2: Cavity Wall Construction - Block Inner and Brick Outer Leaf, Thermal Plasterboard and Skim Internal Finish

  Plasterboard, Insulation, Block, Insulation, Cavity, Block, Render

KORE Key EPS70 Silver (mm) KORE Thermal Board EPS70 Silver KORE Thermal Board EPS70 Silver KORE Thermal Board EPS70 Silver
  25mm 38mm 50mm
  U-Value W/m²K

110 0.20 0.18 0.17
150 0.16 0.15 0.14

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 bridge should not pose a risk of surface or interstitial condensation. KORE have undertaken a complete thermal bridging analysis of KORE Key insulation at all typical junctions. Please contact our technical team today to request a copy of these results.

SPECIFICATION GUIDELINES

For specific technical details relating to the KORE Thermal Board product please refer to the KORE Thermal Board Design Guide. This design guide deals specifically with the KORE Key Cavity Wall Insulation part of the KORE Key System.

Building Standards

KORE Key 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)

Design Standards

The following standards should be consulted regarding the construction of cavity walls

  • BS EN 5250:2002 Code of practice for control of condensation in buildings
  • BS EN 1996-1-1:2005 Eurocode 6 design of masonry structures. Common rules for reinforced and unreinforced masonry structures
  • BS EN 845-1:2003 Specification for ancillary components for masonry. Ties, tension straps, hangers and brackets
  • BS 5628-3:2001 Code of practice for use of masonry. Materials and components, design and workmanship
  • BS 5628-1:2005 Code of practice for use of masonry. Structural use of unreinforced masonry
  • BS 5628-2:2005 Code of practice for use of masonry. Structural use of reinforced and prestressed masonry. 

Residual Cavity Width

Building regulations in Ireland state that a minimum of 40mm residual cavity is recommended in all wall heights for partial fill cavity wall insulation.

Wall Ties

Wall ties used in construction of cavity walls must conform to BS EN 845-1:2003. They should have a retaining clip to ensure the insulation board is secured to the inner masonry leaf. The wall ties should have a double drip. In severe and very severe exposure zones it is advised that stainless steel wall ties should be used.

Water Vapour Control & Condensation

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. You may contact the KORE technical department for further details.

PRODUCT TECHNICAL DETAILS

Density

KORE Key EPS70 Silver: 15kg/m3

Thermal Conductivity

The thermal conductivity of KORE Key Insulation is in accordance with IS EN 13163:2012 and EN 12667 Thermal performance of building materials and products - determination of thermal resistance by means of guarded hot plate and heat flow meter method.

KORE EPS70 Silver: 0.031W/mK

Thermal Resistance

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

  KORE Key EPS70 Silver
Insulation Thickness (mm) Thermal Resistance (m².K/W)
110 3.55
150 4.84

 

DECLARATION OF PERFORMANCE CERTIFICATES

The following Declaration of Performance Certificates can be viewed or downloaded directly by clicking on the links below. You can find all our technical documentation by joining the KORE Resource Centre.

KORE Key EPS70 Silver
KORE Key EPS70 White
KORE Key EPS100 Silver
KORE Key EPS100 White

 

 

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