As seen on RTE’s ‘About the House’
Llewellyn Park is a mix of 3 and 4 bedroom semi detached properties built circa 1975 of hollow block construction. The two clients had agreed to externally insulate the walls and insulate the attics.
By coming together under one contract there was a saving of approximately 10% and the overall job is better. By completing both houses together it is nearly impossible to tell the properties have been insulated as the depth of insulation and finish is consistent.
Prior to commencing the works a BER assessment was completed on both properties which achieved F ratings. The external insulation was 120mm of Rockwool screw fixed to the external walls and finished with the render system. The finish coat of render is self-coloured and there is a 10year guarantee.
The attic was insulated with 300mm of Rockwool, the cold water tank was insulated and we provided a raised walk area for safe access and storage. This system achieved a U value of 0.16 W/m2k as required by SEAI under the HES scheme.
On completion a BER assessment was carried out and the houses achieved a C3 rating which is a significant improvement from the F rating before the retrofit.
• Immediate and dramatic increase in overall comfort levels
• estimated saving of about 40% on the clients’ heating bills
• estimated saving of 2 tonnes of CO2 per year
• the BER rating improved from an ‘F’ to a ‘C3’ rating