Silken Park Development - Citywest - Case Study



Silken Park Citywest Project Details

Project Name: Silken Park Citywest New Build Development

Products Used: KORE Insulated Foundation System

Architect: BBA Architecture

Main Contractor: Durkan Residential

KORE Sales Rep: Steven Magee (@KORE_Steven)

Creating an Affordable Passive House Development

Durkan Residential, in cooperation with DBA Architects, set out to create the largest Passive House development in Ireland to date. Made of up 2, 3 and 4 bedroom homes, each new build was designed and constructed to meet the strict Passive House Standard. Located in Citywest, Co. Dublin, the Silken Park development was built in three phases - the first two completed and a third phase under construction since February 2017. 

These new build homes in phase 3 feature a single leaf, hollow block construction utilising very high levels of insulation in the foundation and external walls. Featuring KORE's Insulated Foundation System, each home sits on a fully engineered insulated foundation manufactured from Expanded Polystyrene (EPS). This system virtually eliminates the wall to floor cold bridge by wrapping the entire foundation in a continuous layer of EPS insulation. Engineered in different thicknesses and strengths of EPS, the system can handle heavy internal loads for both domestic and commercial applications. 

In addition to KORE's Insulated Foundation System, the Silken Park development utilised high density Rockwool external insulation, including a sand and cement render. This external insulation and render system acts as an airtight layer, helping to make the home more comfortable with consistent indoor temperatures throughout all seasons.

Designed for Energy Savings

All of the 59 houses in Phase 3 of the Silken Park development will be certified to the Passive House Standard. To achieve this, each home is engineered as a system, ensuring that all parts work together to reduce energy usage while providing a healthy and comfortable indoor environment for its occupants. As with most Passive House builds, Silken Park utilised the Passive House Planning Package (PHPP) during the planning and design phase. Not only did this help build each home as a complete system, it also allowed Durkan Residential to build to a 12-week schedule, helping to further reduce costs. 

In addition to the insulated foundation and external wall insulation and render, other materials and products were used to help achieve high energy efficiency standards, including mechanical ventilation with heat recovery, air tightness (including full testing), Knauf roof insulation and Munster Joinery Passive House Certified windows, among other materials and systems.

The Silken Park development offers multiple layouts for those interested:

  • 2 bed (terraced/semi-detached) 
  • 3 bed (terraced/semi-detached)
  • 4 bed (semi-detached)
  • 4 bed (detached) 

Insulation U-values achieved 

According to Passive House Plus Magazine, Phase 3 of Silken Park (3 bedroom, semi-detached) achieved a BER rating of A2 and a Y-Factor of 0.02, offering a virtually thermal bridge free building envelope. In addition, depending on the layout and the construction of each home, the air changes per hour varied from 0.2 – 0.29 at 50Pa.  

Product Building Regulations U-Value Achieved


 KORE Insulated Foundation System

0.21/m²K  0.10W/m²K

External Walls

Rockwool Semi-rigid Insulation + 15mm sand and cement render

 0.21W/m²K  0.16W/m²K 


450mm Knauf Ecosse insulation

 0.16W/m²K  0.08W/m²K


Munster Joinery Passive Certified Windows

 2.0W/m²K  0.8W/m²K

Full details about the Silken Park development at Citywest can be found in issue 20 of Passive House Plus Magazine, including in-depth details for all materials and systems used. 

To request a quotation for KORE's Insulated Foundation System, submit your plans and drawings online by following the link below. KORE's Insulated Foundation System is suitable for most build types and ground conditions, and is fully engineered to meet your project's needs and specifications. You can learn more and download our full technical documents by joining the KORE Resource Centre



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