Recent Projects


This house was designed by Consarc Design is situated just off the Lisburn Road in Belfast. With it’s high energy performance and insulation and air tightness levels using Tyvek membrane it achieved an A rating. We used Easi Joists to support a concrete floor with under floor heating together with an advanced heat recovery system from Beam Vacuum & Ventilation. Taking under a year to complete the owners are delighted with their new home.

Speciation is as follows:

External Wall Insulation:
Insulated with 140mm Frametherm and 40mm PIR rigid board fitted on the inside of the studwork. Wall U-value  – 0.13 wm2k

Internal Wall Insulation
Insulated with 100mm Earthwool ecose acoustic between studs to provide great acoustic values.

Ceiling Insulation
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.

Airtight system
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.

Service batten
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 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.

Our air tight result was 1.52m3/ch.m2)@50pa