Lisburn, Co. Down
We completed this Timber Frame home in 2015 in Lisburn, County Down. Our client opted for a very efficient spec using high levels of insulation and airtightness and he combined this with the use of a heat recovery system which means he pays less than £100 a year for his heating bill.
Speciation is as follows:
External Wall Insulation:
Insulated with 140mm Frametherm and 40mm PIR rigid board fitted on the inside of the studwork.
Internal Wall Insulation
Insulated with 100mm Earthwool ecose acoustic between studs to provide great acoustic values.
Insulated with 150mm loft wool insulation fitted in between joist and 150mm loft wool above the joists. 25 MM PIR rigid boards fitted below joists. Over all ceiling U-value 0.12 wm²k.
We used DuPont Reflective membrane on all our external walls and ceilings. By taping the over laps with metalized tape and sealing around doors and window with Siga Corvum window tape. Using these products and a high standard of workmanship we received a 1 in the buildings Airtight test.
Once the airtight membrane is completed we fixed a 50mmx35m batten onto all the external walls and ceilings. This creates a service cavity. This means that no services (Wires or Pipes) need to past through the airtight membrane.
To match our highly effective timber frame walls we fitted Black PVC, double glazed windows and doors which achieve a U-Value of 1.2 wm²k.
Heat recovery system
After getting the top rating in the airtight test we decided to fit a Heat recovery system in order to retain 90% of all heat loss, control levels of condensation and provide fresh filtered air constantly.