Ballymore Eustace Passive Foundation and External Wall Insulation Case Study
Ballymore Eustace Project Details
Project Name: New Detached Dwelling in Ballymore Eustace, Co. Kildare, Ireland
Client: Pat Doran Construction
Main Contractor: Pat Doran Construction
Architect: David Higgins Architectural Services
KORE Sales Rep: Steven Magee (@KORE_Steven)
The Energy Efficiency Problem
The client, Pat Doran Construction, wanted to design and construct a new-build detached dwelling that offered the homeowner superior thermal performance, reduced heating and cooling costs and a comfortable indoor environment. The final design by David Higgins Architectural Services took this into account as shown in the drawing below
The architect and contractor decided that to achieve the desired energy efficiency insulation had to start at ground level. KORE's Insulated Foundation System, the Passive Foundation, was chosen for the job.
A floor U-value of 0.09W/m²K was achieved with the use of the Passive Foundation (300mm HD White EPS 100). Current building regulations in Ireland require a U-value at or below 0.15W/m²K when installed with an underfloor heating system. The Passive Foundation well surpassed the building regulations for the Ballymore Eustace property at a cost comparative to a traditional strip foundation.
Rather than installing cavity wall insulation or dry lining, Pat Doran Construction installed KORE External Insulation to insulate the outside facing walls.
A wall U-value of 0.12W/m²K was achieved with the use of KORE External 250mm SD Silver EPS 70. Current building regulations in Ireland require a U-value at or below 0.21W/m²K for external walls. KORE External well surpassed the required building regulations.
A pitched roof U-value of 0.12W/m²K and thermal conductivity of .034 was achieved using 370mm of Isover Metac Mineral Wool Insulation, and a flat roof U-value of .08W/m²K and thermal conductivity of 0.44 was achieved using 600mm of fibre glass insulation. Building regulations in Ireland require 0.16W/m²K and 0.20W/m²K respectively.
High performance insulation was used in conjunction with Munster Joinery Passive Future Proof Windows and Doors and a Vent-Axia Ventilation Unit.
Insulation U-values achieved
|Product||Building Regulations||U-Value Achieved|
|KORE Passive Foundation (300mm HD White EPS 100)||0.15W/m²K||0.09W/m²K|
|KORE External Insulation (250mm SD Silver EPS 70)|| 0.21W/m²K
|370mm Isover Metac Minteral Wool - Pitched Roof||0.20W/m²K||0.12W/m²K|
|600mm Fibre Glass Insulation - Flat Roof|| 0.20W/m²K
The end result for the homeowner is a extremely well constructed and energy efficient building. The building envelope and ventilation allows fresh air to enter the home without a significant loss of heat during the heating season through the foundation, external walls and roof. The insulating materials made from expanded polystyrene (EPS), such as the insulated foundation system and external insulation, will last the lifetime of the building. These products are resistant to moisture and will not degrade, rot or allow for mould growth over time.