IRISH BUILDING REGULATIONS

Ireland Building Regulations (New Build & Retrofit)


The following Building Regulations are relevant to the insulation industry in Ireland. Please keep in mind that Ireland's Building Regulations continually change and that the information below should be used as a guide only.

 

U-VALUE REQUIREMENTS IN IRELAND     

 

A U-value is a number which measures the effectiveness of insulating materials. The lower the U-value, the less heat will be lost through a building element. Ireland's Building Regulations, specifically Part L - Conservation of Fuel and Energy - Dwellings (2011) Technical Guidance Document, outline the required U-value for each area of the home. These U-values are displayed in the table below:

New Buildings

Building Element Minimum U-Value
Ground Floor (No Underfloor Heating) 0.21W/m²K
Ground Floor (Underfloor Heating) 0.15W/m²K
External Walls 0.21W/m²K
Flat Roof 0.20W/m²K
Pitched Roof (Sloping Ceilings; Rafter Level) 0.16W/m²K
Cold Roof (Ceiling Level) 0.16W/m²K

 

Existing Buildings

Building Element Minimum U-Value
Ground Floor (No Underfloor Heating)  0.45W/m²K*
Ground Floor (Underfloor Heating) 0.15W/m²K
External Walls (Cavity)   0.55W/m²K**
External Walls (Other - Not Cavity) 0.35W/m²K
Flat Roof 0.25W/m²K
Pitched Roof (Sloping Ceilings; Rafter Level) 0.16W/m²K
Cold Roof (Ceiling Level) 0.25W/m²K

*U-value only applies when ground floors are being replaced.
** U-value only applies if walls are suitable for cavity wall insulation. If not, 0.35W/m²K must be met. 

 

      THERMAL BRIDGING GUIDELINES 

 

 

 

Care must be taken to ensure the continuity of insulation. This helps to avoid unneeded and "excessive" heat loss and condensation, which can lead to mould growth, rot and structural problems. Thermal bridges can be found at common junctions (wall to floor, wall to roof), around windows and doors and around other openings. The DEAP methodology assists with the calculation of heat loss due to thermal bridging and its associated CO2 emissions. 

More information on thermal bridging and relevant guidelines can be found in the Technical Guidance Document - Part L - Conservation of Fuel and Energy - Dwellings 2011

 

THE REQUIREMENTS OF PART L     

 

Below is a summary of Part L of Ireland's Building Regulations:

Energy requirements and related CO2 emissions must be limited as is reasonably practical during the design and construction of buildings in Ireland. 

For Existing Buildings:

  • Heat loss must be limited and heat gain should be maximised through the use of the building's fabric (insulation, air tightness membranes etc.)
  • The output of space heating and hot water heating systems should be controlled, as appropriate
  • Heat loss must be limited through pipes, ducts and vessels that are used to transport, or for the storage of both heated water and air
  • Gas and oil fired boilers must meet a minimum seasonal efficiency of 90 percent when practical (when original systems are replaced in existing buildings)

For New Buildings:

  • Primary energy consumption and related CO2 emissions will be limited, whenever practical calculated using DEAP (Dwelling Energy Assessment Procedure) that has been published by the Sustainable Energy Authority of Ireland (SEAI)
  • A reasonable proportion of energy must be provided by renewable sources (solar, wind, heat pumps etc.)
  • Heat loss must be limited and heat gain maximised through the use of the building's fabric (insulation, air tightness membranes, windows, etc.)
  • Utilising water and space heating systems with both efficient heat sources and controls
  • A minimum seasonal efficiency of 90 percent for all gas and oil fired boilers
  • The owner of the dwelling must be provided information and instructions on how to operate the building using only a reasonable amount of fuel and energy required for proper operation

 

        IRELAND'S BUILDING REGULATIONS 

 

 

 

 

Technical Guidance Documents published by the Department of the Environment, Community and Local Government can assist those involved in the planning, design and construction of dwellings to meet Ireland's Building Regulations:

  1. Technical Guidance Document A - Structure 
  2. Technical Guidance Document B - Fire Safety
  3. Technical Guidance Document C - Site Preparation and Resistance to Moisture
  4. Technical Guidance Document D - Materials and Workmanship
  5. Technical Guidance Document E - Sound
  6. Technical Guidance Document F - Ventilation
  7. Technical Guidance Document G - Hygiene
  8. Technical Guidance Document H - Drainage and Waste Water Disposal
  9. Technical Guidance Document J - Heat Producing Appliances
  10. Technical Guidance Document K - Stairways, Ladders, Ramps and Guards
  11. Technical Guidance Document L - Conservation of Fuel and Energy - Dwellings
  12. Technical Guidance Document M - Access and Use
  13. Technical Guidance Document L - Conservation of Fuel and Energy - Buildings Other Than Dwellings

 

The associated Building Regulations can be found here:

Part A - Structure

  1. S.I. 138 of 2012 Building Regulations (Part A Amendment) Regulations 2012

Part B - Fire Safety

  1. S.I. 115 of 2006 (Part B) - Building Regulations (Amendment) Regulations 2006

Part C - Site Preparation and Resistance to Moisture

  1. S.I. No. 497 of 1997 Building Regulations

Part D - Materials and Workmanship

  1. S.I. 224 of 2013 Building Regulations (Part D Amendment) Regulations 2013

Part E - Sound

  1. S.I. 606 of 2014 Building Regulations (Part E Amendment) Regulations 2014

Part F - Ventilation

  1. S.I. 556 of 2009 Building Regulations (Part F Amendment) Regulations 2009

Part G - Hygiene

  1. S.I. 335 of 2008 Building Regulations (Part G Amendment) Regulations 2008

Part H - Drainage and Waste Water Disposal

  1. S.I. 561 of 2010 Building Regulations (Part H Amendment) Regulations 2010

Part J - Heat Producing Appliances

  1. S.I. 113 of 2014 Building Regulations (Part J Amendment) Regulations 2014

Part K - Stairways, Ladders, Ramps and Guards

  1. S.I. 180 of 2014 Building Regulations (Part K Amendment) Regulations 2014

Part L - Conservation of Fuel and Energy - Dwellings

  1. S.I. 259 of 2011 Building Regulations (Part L Amendment) Regulations 2011

Part L - Conservation of Fuel and Energy - Buildings Other Than Dwellings

  1. S.I. 259 of 2008 Building Regulations (Part L Amendment) Regulations 2008

Part M - Access and Use

  1. S.I. 513 of 2010 Building Regulations (Part M Amendment) Regulations 2010

 

Methodology for the Energy Efficient Retrofit of Existing Dwellings:

  1. NSAI Standard Recommendation S.R. 54:2014 Code of Practice

 

EXPANDED POLYSTYRENE     

 

KORE EPS can easily meet and exceed Ireland's Building Regulations with proper design and planning. You can learn more about EPS and download our technical documentation by joining the KORE Resource Centre.

KORE EPS offers a high thermal performance and can be used towards a whole-home insulation solution. See how Expanded Polystyrene compares against alternative insulation materials, such as PIR.